Wanbin Zhang

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Name: 张万斌; Zhang, WanBin
Organization: Shanghai Jiao Tong University , China
Department: School of Chemistry and Chemical Engineering
Title: Professor(PhD)

TOPICS

Co-reporter:Rui He, Penglin Liu, Xiaohong Huo, and Wanbin Zhang
Organic Letters October 20, 2017 Volume 19(Issue 20) pp:5513-5513
Publication Date(Web):October 6, 2017
DOI:10.1021/acs.orglett.7b02577
A one-step enantioselective and diastereodivergent α-allylation of unprotected α-hydroxy indanones has been developed using an Ir/Zn dual catalyst system; no additional base is required. The cyclic tertiary α-hydroxyketones containing vicinal stereocenters can be synthesized with excellent enantioselectivity (up to >99% ee) and good diastereoselectivity (up to 12:1 dr). By a simple choice of the appropriate chiral metal catalyst combination, all four product stereoisomers could be obtained from the same starting materials and under identical conditions.
Co-reporter:Wanbin Zhang;Qianjia Yuan;Delong Liu
Organic Letters March 3, 2017 Volume 19(Issue 5) pp:1144-1147
Publication Date(Web):February 17, 2017
DOI:10.1021/acs.orglett.7b00171
An efficient asymmetric hydrogenation of β,γ-unsaturated γ-lactams using an iridium–phosphoramidite complex is reported. The chiral γ-lactams were obtained in excellent yields and enantioselectivities (up to 99% yield and 99% ee). The mechanistic studies indicated that the reduced products were obtained via the hydrogenation of the N-acyliminium cations, generated from β,γ-unsaturated γ-lactams, which was verified by 1H NMR analysis. The reaction was carried out at a reduced catalyst loading of 0.1 mol %, and the reduced products can be transformed to two potential bioactive compounds. A new route is provided for the synthesis of chiral γ-lactams.
Co-reporter:Xiaohong Huo, Rui He, Jingke Fu, Jiacheng Zhang, Guoqiang Yang, and Wanbin Zhang
Journal of the American Chemical Society July 26, 2017 Volume 139(Issue 29) pp:9819-9819
Publication Date(Web):July 7, 2017
DOI:10.1021/jacs.7b05460
We report a stereoselective and site-specific allylic alkylation of Schiff base activated amino acids and small peptides via a Pd/Cu dual catalysis. A range of noncoded α,α-dialkyl α-amino acids were easily synthesized in high yields and with excellent enantioselectivities (up to >99% ee). Furthermore, a direct and highly stereoselective synthesis of small peptides with enantiopure α-alkyl or α,α-dialkyl α-amino acids residues incorporated at specific sites was accomplished using this dual catalyst system.
Co-reporter:Chao Xia, Jiefeng Shen, Delong Liu, and Wanbin Zhang
Organic Letters August 18, 2017 Volume 19(Issue 16) pp:
Publication Date(Web):August 3, 2017
DOI:10.1021/acs.orglett.7b01904
A Pd-catalyzed asymmetric allylic amination of 4-substituted 2-acetoxybut-3-enoates with amines has been developed for the regiospecific synthesis of chiral α,β-unsaturated γ-amino esters. The desired chiral aminated products can be obtained in up to 98% yield, and 99% ee and can be conveniently transformed to chiral γ-amino acid/alcohol derivatives and chiral γ-lactams, which can then be subjected to the synthesis of several types of chiral drugs and drug candidates. The preferential formation of chiral γ-amino esters may be attributed to the bulky substituents on the right side of the allyl substrates. This work provides an efficient strategy for the synthesis of chiral α,β-unsaturated γ-amino esters and their derivatives.
Co-reporter:Qianjia Yuan, Delong Liu, and Wanbin Zhang
Organic Letters April 7, 2017 Volume 19(Issue 7) pp:
Publication Date(Web):March 27, 2017
DOI:10.1021/acs.orglett.7b00651
Chiral γ-lactams have been synthesized in excellent yields and enantioselectivities (up to 99% yield and 96% ee) from easily accessible racemic γ-hydroxy γ-lactams via an iridium-phosphoramidite catalyzed asymmetric hydrogenation. The reaction was designed based on insight into the reaction mechanism demonstrated in previous work and can be carried out at a reduced catalyst loading of 0.1 mol % on a gram scale. Several potential bioactive compounds can be synthesized from the reduced products. Mechanistic studies indicated that the reduced products were obtained via the hydrogenation of the N-acyliminium cations, generated from γ-hydroxy γ-lactams.
Co-reporter:Qianjin An, Delong Liu, Jiefeng Shen, Yangang Liu, and Wanbin Zhang
Organic Letters 2017 Volume 19(Issue 1) pp:238-241
Publication Date(Web):December 23, 2016
DOI:10.1021/acs.orglett.6b03529
A highly enantioselective Pd-catalyzed asymmetric allylic substitution cascade of cyclic N-sulfonylimines with an accompanying asymmetric desymmetrization has been developed for the construction of fused tetrahydroindole derivatives bearing two chiral centers. Mechanistic studies confirmed that the cascade reaction proceeds by initial allylic alkylation and subsequent allylic amination. The first alkylation is a chirality-control step and represents an asymmetric desymmetrization of cis-cyclic allyl diacetates. The reaction has been performed on a gram scale, and the desired products can take part in several transformations.
Co-reporter:Yu Li, Xuezhen Kou, Chenghao Ye, Xinghua Zhang, Guoqiang Yang, Wanbin Zhang
Tetrahedron Letters 2017 Volume 58(Issue 4) pp:285-288
Publication Date(Web):25 January 2017
DOI:10.1016/j.tetlet.2016.11.113
•A olefin diamination was developed using N-methoxyl amide as the intramolecular nitrogen source.•The desired products were obtained in up to 90% yield using NFSI as the oxidant.•This reaction provides an efficient and direct access to isoindolinones with amine functionality.A Pd(II)-catalyzed cyclization using oxidative olefin diamination was developed for the preparation of isoindolinones from ortho-olefinic N-methoxybenzamides. Using the optimized reaction conditions, the desired products were obtained in up to 90% yield using NFSI as the oxidant. This reaction provides an efficient and direct access to isoindolinones with amine functionality, an important drug skeleton.
Co-reporter:Ke Meng;Jingzhao Xia;Yanzhao Wang;Xinghua Zhang;Guoqiang Yang
Organic Chemistry Frontiers 2017 vol. 4(Issue 8) pp:1601-1605
Publication Date(Web):2017/07/26
DOI:10.1039/C7QO00248C
An efficient asymmetric hydrogenation of 3-substituted 2,5-dihydropyrroles using an Ir catalyst with an axially flexible chiral phosphine-oxazoline ligand was developed and chiral 3-substituted pyrrolidines could be prepared with excellent ee. 3-Substituted 2,5-dihydrothiophene 1,1-dioxides could also be hydrogenated by our catalyst, giving the desired products with moderate to high enantioselectivities.
Co-reporter:Zheng Ling;Sonia Singh;Fang Xie;Liang Wu
Chemical Communications 2017 vol. 53(Issue 39) pp:5364-5367
Publication Date(Web):2017/05/11
DOI:10.1039/C7CC02159C
A Cu-catalyzed asymmetric alkynylation of cyclic N-sulfonyl ketimines was developed, providing the corresponding chiral α-tertiary amines with up to 98% ee. The method tolerates some variations in cyclic N-sulfonyl ketimine and alkyne scope. These products could be used in several transformations, in particular, the products of 6-membered cyclic N-sulfonyl ketimines could be easily converted to linear chiral α-tertiary amines. This asymmetric alkynylation provides an efficient, gram-scale, low-cost transition-metal catalyzed synthesis of chiral α-tetrasubstituted propargylamines.
Co-reporter:Jingke Fu;Xiaohong Huo;Bowen Li
Organic & Biomolecular Chemistry 2017 vol. 15(Issue 46) pp:9747-9759
Publication Date(Web):2017/11/29
DOI:10.1039/C7OB02476B
Synergistic catalysis is gaining increasing attention due to its advantages over traditional catalytic methodologies, such as improved catalytic activity, broader substrate scope, increased selectivity and lower cost. Methodologies involving the synergistic combination of metal catalysts and organocatalysts have been intensively studied. Given the clear benefits of bimetallic catalyst systems consisting of two distinct metal catalysts, cooperative bimetallic catalysis has proved to be successful for a number of difficult asymmetric transformations. This review highlights the recent advances in bimetallic systems for catalytic asymmetric allylic substitution reactions. Strategies using a chiral metal catalyst and the cooperative effect of a second achiral metal catalyst for asymmetric transformations are discussed. Additionally, several challenging asymmetric reactions realized by employing two different chiral metal catalysts in a synergistic manner are also covered.
Co-reporter:Yang Liu;Boqiang Ding;Delong Liu;Zhenfeng Zhang
Research on Chemical Intermediates 2017 Volume 43( Issue 8) pp:4959-4966
Publication Date(Web):07 April 2017
DOI:10.1007/s11164-017-2923-6
Chiral organophosphorus compounds possessing a P-stereogenic center have been widely used as agricultural chemicals, pharmaceuticals, organocatalysts, and ligands for transition-metal catalysis. P-Stereogenic intermediates bearing a tert-butyl(methyl)phosphino group are important for the preparation of several commonly used diphosphine ligands. However, previously reported synthetic methods used hazardous starting materials and are difficult to operate. In order to overcome these limitations, a new and convenient synthesis for a number of P-stereogenic intermediates possessing a tert-butyl(methyl)phosphino group has been developed. The reported route relies on an air- and moisture-stable secondary phosphine oxide prepared from a readily available starting material, trichlorophosphane.
Co-reporter:Yanzhao Wang;Yuanyuan Liu;Kun Li;Guoqiang Yang
Advanced Synthesis & Catalysis 2017 Volume 359(Issue 11) pp:1933-1941
Publication Date(Web):2017/06/06
DOI:10.1002/adsc.201700175
AbstractTwo different iridium catalyst systems, generated from the ruthenocene-based phosphine-oxazoline ligand tBu-mono-RuPHOX or the diphosphine ligand BINAP, were developed for the asymmetric hydrogenation of 5,6-dihydropyrazin-2(1H)-ones, affording chiral piperazin-2-ones in good yields and with moderate to good ees. Different catalytic behaviors for the hydrogenation of these types of substrate were observed with these two catalyst systems. Our tBu-mono-RuPHOX ligand, which bears a ruthenocene scaffold with planar chirality, was found to be the best ligand for the [Ir(L)(COD)]BArF catalyst system, affording the desired products with up to 94% ee.
Co-reporter:Mao Quan;Liang Tang;Jiaqi Shen;Guoqiang Yang
Chemical Communications 2017 vol. 53(Issue 3) pp:609-612
Publication Date(Web):2017/01/03
DOI:10.1039/C6CC08759K
A Ni(II)-catalyzed asymmetric addition of arylboronic acids to cyclic aldimines and ketimines is reported. Our tropos phosphine-oxazoline biphenyl ligand is crucial for the high catalytic activity, which coordinates to Ni(II) to form a complex with a single axial configuration. The desired chiral amine products could be prepared with excellent yields (up to 99%) and enantioselectivities (up to 99.8%) under mild reaction conditions.
Co-reporter:Zhengxing Wu, Jingang Zhang, Yunyi Li, Wanbin Zhang
Tetrahedron Letters 2017 Volume 58, Issue 27(Issue 27) pp:
Publication Date(Web):5 July 2017
DOI:10.1016/j.tetlet.2017.05.053
•An aerobic intermolecular 1,4-diamination of conjugated dienes has been developed.•The first metal-catalyzed 1,4-diamination of conjugated dienes was reported.•A series of medium ring compounds were constructed via [4+4] annulations.•Oxygen was successfully used as the terminal oxidant.The first metal-catalyzed oxidative intermolecular 1,4-diamination of conjugated dienes has been developed. A series of medium ring compounds were constructed via palladium-catalyzed intermolecular [4+4] annulations. Oxygen was successfully used as an oxidant instead of the existing stoichiometric metals or hypervalent iodine reagents. 20 examples are reported, and good yields and regioselectivities could be obtained for the majority of diamines and conjugated diene substrates.Download high-res image (41KB)Download full-size image
Co-reporter:Xiaohong Huo, Rui He, Xiao Zhang, and Wanbin Zhang
Journal of the American Chemical Society 2016 Volume 138(Issue 35) pp:11093-11096
Publication Date(Web):August 22, 2016
DOI:10.1021/jacs.6b06156
An Ir/Zn dual catalysis has been developed for the enantio- and diastereodivergent α-allylation of unprotected α-hydroxyketones under mild conditions, in the absence of any additional base. The cooperative action of a chiral iridium complex derived from phosphoramidites and a chiral Zn-ProPhenol complex is most likely responsible for its high reactivity, excellent enantioselectivity (up to >99% ee), and good diastereoselectivity (up to >20:1 dr). All four product stereoisomers could be prepared from the same set of starting materials and under identical conditions by simple selection of appropriate catalyst combinations.
Co-reporter:Kun Yao, Delong Liu, Qianjia Yuan, Tsuneo Imamoto, Yangang Liu, and Wanbin Zhang
Organic Letters 2016 Volume 18(Issue 24) pp:6296-6299
Publication Date(Web):December 5, 2016
DOI:10.1021/acs.orglett.6b03161
A Pd-catalyzed asymmetric allylic substitution with 1,3-dithianes as acyl anion equivalents has been developed in high yields and excellent enantioselectivities. The reaction was performed on a gram scale, and the corresponding alkylated products were conveniently converted into several biologically active products. This work provides an alternative strategy utilizing electrophilic carbonyl compounds as nucleophilic species in a Pd-catalyzed allylic substitution.
Co-reporter:Yuping Hong, Jianzhong Chen, Zhenfeng Zhang, Yangang Liu, and Wanbin Zhang
Organic Letters 2016 Volume 18(Issue 11) pp:2640-2643
Publication Date(Web):May 23, 2016
DOI:10.1021/acs.orglett.6b01073
Via a strategy of asymmetric reductive desymmetrization, chiral cis-epoxy naphthoquinols with multiple contiguous stereocenters and functional groups were synthesized with excellent enantioselectivities (96–99% ee) and diastereoselectivities (8/1–15/1). A combined asymmetric hydrogenation/transfer hydrogenation mechanism was proposed based on experimental results.
Co-reporter:Jing Li, Jiefeng Shen, Chao Xia, Yanzhao Wang, Delong Liu, and Wanbin Zhang
Organic Letters 2016 Volume 18(Issue 9) pp:2122-2125
Publication Date(Web):April 25, 2016
DOI:10.1021/acs.orglett.6b00748
Asymmetric hydrogenation of various α-substituted acrylic acids was carried out using RuPHOX–Ru as a chiral catalyst under 5 bar H2, affording the corresponding chiral α-substituted propanic acids in up to 99% yield and 99.9% ee. The reaction could be performed on a gram-scale with a relatively low catalyst loading (up to 5000 S/C), and the resulting product (97%, 99.3% ee) can be used as a key intermediate to construct bioactive chiral molecules. The asymmetric protocol was successfully applied to an asymmetric synthesis of dihydroartemisinic acid, a key intermediate required for the industrial synthesis of the antimalarial drug artemisinin.
Co-reporter:Qiupeng Hu, Jianzhong Chen, Zhenfeng Zhang, Yangang Liu, and Wanbin Zhang
Organic Letters 2016 Volume 18(Issue 6) pp:1290-1293
Publication Date(Web):March 8, 2016
DOI:10.1021/acs.orglett.6b00212
Catalyzed by a rhodium complex of P-stereogenic diphosphine ligand (R)-2-tert-butylmethylphosphino-3-(di-tert-butylphosphino)quinoxaline ((R)-3H-QuinoxP*), five-membered cyclic α-dehydroamino ketones bearing endocyclic vinyl and endocyclic keto-carbonyl groups were sequentially hydrogenated to give chiral cyclic trans-β-amino alcohols with two contiguous stereocenters in quantitative conversions, excellent enantioselectivities and good diastereoselectivities.
Co-reporter:Qun He; Liang Wu; Xuezhen Kou; Nicholas Butt; Guoqiang Yang
Organic Letters 2016 Volume 18(Issue 2) pp:288-291
Publication Date(Web):December 31, 2015
DOI:10.1021/acs.orglett.5b03458
A Pd(II)/Pyrox-catalyzed enantioselecitve addition of arylboronic acids to 3-ketimino oxindoles was developed, providing chiral 3-amino-2-oxindoles with a quaternary stereocenter in high yields and with good enantioselectivities. A variety of functionalized 3-ketimino oxindoles can be used, and the method tolerates some variation in arylboronic acid scope. This asymmetric arylation provides an alternative efficient catalytic method for the preparation of chiral 3-aryl-3-amino-2-oxindoles, which also represents the first example of a Pd(II)-catalyzed addition of arylborons to exocyclic ketimines.
Co-reporter:Yufeng Liu, Jianzhong Chen, Zhenfeng Zhang, Jian Qin, Min Zhao and Wanbin Zhang  
Organic & Biomolecular Chemistry 2016 vol. 14(Issue 29) pp:7099-7102
Publication Date(Web):28 Jun 2016
DOI:10.1039/C6OB00871B
A one-pot sequential asymmetric hydrogenation of β-aryl-β-aryloxy acroleins has been realized for the preparation of chiral 3-aryl-3-aryloxy alcohols with excellent yields and good enantioselectivities. This methodology can be employed in new synthetic routes for the synthesis of fluoxetine, atomoxetine, and related analogues.
Co-reporter:Zhenfeng Zhang, Nicholas A. Butt, and Wanbin Zhang
Chemical Reviews 2016 Volume 116(Issue 23) pp:
Publication Date(Web):November 22, 2016
DOI:10.1021/acs.chemrev.6b00564
Chiral cyclic structures are found in numerous natural products, pharmaceutical compounds, and important synthetic intermediates. Asymmetric hydrogenation, allowing for the preparation of these complex targets in an environmentally benign and efficient manner, has received much attention over the past few years. This review summarizes the advances in the construction of chiral heterocycles and carbocycles (including cyclic amines, ethers, alcohols, and alkanes) via the asymmetric hydrogenation of nonaromatic cyclic substrates (including prochiral cyclic imines, ketones, and alkenes) using appropriate transition-metal complexes.
Co-reporter:Guoqiang Yang, Chaoren Shen, Mao Quan, Wanbin Zhang
Tetrahedron 2016 Volume 72(Issue 2) pp:333-337
Publication Date(Web):14 January 2016
DOI:10.1016/j.tet.2015.11.045
An efficient method was developed for the synthesis of a variety of arylphosphorus compounds from P–H compounds using o-(trimethylsilyl)aryl triflates as aryne precursors. The reaction provides a practical preparation of various arylphosphorus compounds via aryne intermediates utilizing diarylphosphine oxides and dialkyl phosphites as the nucleophiles.
Co-reporter:Dongyang Fan, Jian Lu, Yang Liu, Zhenfeng Zhang, Yangang Liu, Wanbin Zhang
Tetrahedron 2016 Volume 72(Issue 35) pp:5541-5547
Publication Date(Web):1 September 2016
DOI:10.1016/j.tet.2016.07.046
Catalyzed by a rhodium complex of P-stereogenic diphosphine ligand trichickenfootphos (TCFP), asymmetric hydrogenation of racemic aldimines via dynamic kinetic resolution has been realized for the preparation of chiral arylglycines with good yields and enantioselectivities.
Co-reporter:Xun-Xiang Guo, Da-Wei Gu, Zhengxing Wu, and Wanbin Zhang
Chemical Reviews 2015 Volume 115(Issue 3) pp:1622
Publication Date(Web):December 22, 2014
DOI:10.1021/cr500410y
Co-reporter:Nicholas A. Butt and Wanbin Zhang  
Chemical Society Reviews 2015 vol. 44(Issue 22) pp:7929-7967
Publication Date(Web):21 Aug 2015
DOI:10.1039/C5CS00144G
The transition metal-catalyzed allylic substitution of unactivated allylic substrates (allylic alcohols, allylic ethers and allylic amines) is rapidly becoming an important area of research. There are several advantages to using these substrates in allylic substitution reactions: the use of unactivated alcohols minimizes the production of waste by-products and reaction steps; and allylic ethers and allylic amines are useful substrates because of their stability and their presence in numerous biologically active compounds. Research in this field has therefore gained widespread attention for promoting the development of efficient and environmentally benign procedures for the formation of C–C, C–N and C–O bonds.
Co-reporter:Qianjia Yuan, Kun Yao, Delong Liu and Wanbin Zhang  
Chemical Communications 2015 vol. 51(Issue 59) pp:11834-11836
Publication Date(Web):12 Jun 2015
DOI:10.1039/C5CC04085J
An efficient Ir-catalyzed allyl–allyl cross-coupling reaction of allylic carbonates with (E)-1,3-diarylpropenes was developed to form linear allylated products, 1,5-dienes, regioselectively in excellent yields and with high turnover numbers (up to 2000 S/Ir).
Co-reporter:Xuan Wei, Delong Liu, Qianjin An, and Wanbin Zhang
Organic Letters 2015 Volume 17(Issue 23) pp:5768-5771
Publication Date(Web):November 17, 2015
DOI:10.1021/acs.orglett.5b02868
A Pd-catalyzed asymmetric allylic alkylation of azlactones with 4-arylvinyl-1,3-dioxolan-2-ones was developed, providing “branched” chiral α-amino acids with vicinal tertiary and quaternary stereocenters, in high yields and with excellent selectivities. Mechanistic studies revealed that the formation of a hydrogen bond between the Pd-allylic complex and azlactone isomer is responsible for the excellent regioselectivities. This asymmetric alkylation can be carried out on a gram scale without a loss of catalytic efficiency, and the resulting product can be further transformed to a chiral azetidine in two simple steps.
Co-reporter:Xuezhen Kou, Yu Li, Liang Wu, Xinghua Zhang, Guoqiang Yang, and Wanbin Zhang
Organic Letters 2015 Volume 17(Issue 22) pp:5566-5569
Publication Date(Web):November 2, 2015
DOI:10.1021/acs.orglett.5b02703
A palladium-catalyzed intramolecular isoindolinone-forming aminooxygenation of alkenes with 1 atm of oxygen as oxidant is reported. A variety of functionalized alkenes and carboxylic acids can be used, and high yields were observed. Preliminary mechanistic studies revealed that the aminooxygenation products were formed through the oxidation of a C–PdII species using a strong oxidant, peroxide, which is generated in situ from a Pd(OAc)2/bpy/O2/HOAc catalytic system.
Co-reporter:Zhenfeng Zhang, Qiupeng Hu, Yingjie Wang, Jianzhong Chen, and Wanbin Zhang
Organic Letters 2015 Volume 17(Issue 21) pp:5380-5383
Publication Date(Web):October 26, 2015
DOI:10.1021/acs.orglett.5b02733
Catalyzed by a rhodium complex of P-stereogenic diphosphine trichickenfootphos, five-membered cyclic α-dehydroamino ketones bearing endocyclic acyl and endocyclic vinyl groups were hydrogenated to give chiral α-amino ketones with quantitative conversions and excellent enantioselectivities.
Co-reporter:Qun He, Fang Xie, Guanghong Fu, Mao Quan, Chaoren Shen, Guoqiang Yang, Ilya D. Gridnev, and Wanbin Zhang
Organic Letters 2015 Volume 17(Issue 9) pp:2250-2253
Publication Date(Web):April 16, 2015
DOI:10.1021/acs.orglett.5b00863
A palladium-catalyzed asymmetric addition of arylboronic acids to nitrostyrene is reported. The catalytic system employing iPr-IsoQuinox as a chiral ligand in MeOH solvent under an air atmosphere provides the chiral diarylsubstituted products in high yields with good enantioselectivities. A variety of functionalized nitrostyrenes can be used, and the method tolerates some variation in arylboronic acid scope. The stereochemical outcome can be explained using a stereochemical model.
Co-reporter:Qianjin An, Jing Li, Jiefeng Shen, Nicholas Butt, Delong Liu, Yangang Liu and Wanbin Zhang  
Chemical Communications 2015 vol. 51(Issue 5) pp:885-888
Publication Date(Web):20 Nov 2014
DOI:10.1039/C4CC07051H
An organocatalyzed asymmetric tandem reaction of cyclic N-sulfonylimines and α,β-unsaturated aldehydes was developed. These substrates follow an alternative reaction pathway to that of reactions involving saturated aldehydes, affording similar piperidine derivatives.
Co-reporter:Hongwei Wu, Fang Xie, Yanlan Wang, Xiaohu Zhao, Delong Liu and Wanbin Zhang  
Organic & Biomolecular Chemistry 2015 vol. 13(Issue 14) pp:4248-4254
Publication Date(Web):24 Feb 2015
DOI:10.1039/C5OB00032G
Compared to their C1-symmetric counterparts, planar chiral C2-symmetric metallocenyl P,N-ligands are efficient chiral ligands for Pd-catalyzed asymmetric allylic aminations, providing a number of amination products with high enantioselectivities. A non-C2-symmetric ferrocenyl P,N-ligand (a by-product obtained during the synthesis of the above C2-symmetric species) was also found to be an efficient ligand for asymmetric allylic aminations. A mixed ligand system consisting of both C2- and non-C2-symmetric ferrocene complexes was examined and showed high catalytic activity with the amination products being obtained with excellent enantioselectivities.
Co-reporter:Zehua Yang, Chao Xia, Delong Liu, Yangang Liu, Masashi Sugiya, Tsuneo Imamoto and Wanbin Zhang  
Organic & Biomolecular Chemistry 2015 vol. 13(Issue 9) pp:2694-2702
Publication Date(Web):05 Jan 2015
DOI:10.1039/C4OB02402H
A new P-stereogenic PNP pincer-Pd complex was readily prepared from optically pure 2,6-bis[(boranato(tert-butyl)methylphosphino)methyl]pyridine. It was used in the asymmetric intramolecular hydroamination of amino-1,3-dienes, with the desired products being obtained in good yields and with excellent regioselectivities and up to moderate enantioselectivities. The absolute configuration of one of the hydroamination products was determined by X-ray crystallography studies. This simple and efficient procedure can be used for the synthesis of allyl-type chiral pyrrolidine derivatives.
Co-reporter:Zehua Yang, Delong Liu, Yangang Liu, Masashi Sugiya, Tsuneo Imamoto, and Wanbin Zhang
Organometallics 2015 Volume 34(Issue 7) pp:1228-1237
Publication Date(Web):March 26, 2015
DOI:10.1021/om501287k
Novel P-stereogenic pincer-Ni complexes {κP,κC,κP-3,5-Me2-2,6-(MetBuPCH2)2C6H}NiCl (3), {κP,κC,κP-3,5-Me2-2,6-(MetBuPCH2)2C6H}NiOTf (4), [{κP,κN,κP-2,6-(MetBuPCH2)2C5H3N}NiCl]Cl (7), [{κP,κN,κP-2,6-(MetBuPCH2)2C5H3N}NiCl]BF4 (8), and [{κP,κN,κP-2,6-(MetBuPCH2)2C5H3N}Ni(NCMe)](BF4)2 (9) were synthesized in 55–84% yields and characterized by 1H NMR, 13C{1H} NMR, 31P{1H} NMR, 19F{1H} NMR, and/or single-crystal X-ray diffractions. The ORTEP diagrams of complexes 3, 7, 8, and 9 show that the coordination geometries around the Ni center in all these structures are approximately square planar but have different bond lengths and angles. These complexes were shown to be active catalysts for the asymmetric aza-Michael addition of α,β-unsaturated nitriles. For most examples good to excellent yields (up to 99%) and moderate enantiomeric excesses (up to 46% ee) were obtained. Notably, the PCP complex 3 exhibited higher catalytic activity in the aza-Michael addition than the PNP complexes 7, 8, and 9. Two achiral PCP-type pincer-Ni complexes, {κP,κC,κP-3,5-Me2-2,6-(tBu2PCH2)2C6H}NiCl (11) and {κP,κC,κP-3,5-Me2-2,6-(Ph2PCH2)2C6H}NiCl (13), were also synthesized and fully characterized in order to reveal the structural differences between the chiral and achiral complexes.
Co-reporter:Qiupeng Hu;Dr. Zhenfeng Zhang; Yangang Liu; Tsuneo Imamoto; Wanbin Zhang
Angewandte Chemie 2015 Volume 127( Issue 7) pp:2288-2292
Publication Date(Web):
DOI:10.1002/ange.201411384

Abstract

A new catalytic system has been developed for the asymmetric hydrogenation of β-secondary-amino ketones using a highly efficient P-chiral bisphosphine–rhodium complex in combination with ZnCl2 as the activator of the catalyst. The chiral γ-secondary-amino alcohols were obtained in 90–94 % yields, 90–99 % enantioselectivities, and with high turnover numbers (up to 2000 S/C; S/C=substrate/catalyst ratio). A mechanism for the promoting effect of ZnCl2 on the catalytic system has been proposed on the basis of NMR spectroscopy and HRMS studies. This method was successfully applied to the asymmetric syntheses of three important drugs, (S)-duloxetine, (R)-fluoxetine, and (R)-atomoxetine, in high yields and with excellent enantioselectivities.

Co-reporter:Hongwei Wu, Qianjin An, Delong Liu, Wanbin Zhang
Tetrahedron 2015 Volume 71(Issue 32) pp:5112-5118
Publication Date(Web):12 August 2015
DOI:10.1016/j.tet.2015.06.006
An interesting temperature-controlled switchable o,o′-dilithiation of chiral bisoxazoline ferrocene was developed for the preparation of three kinds of ferrocene bis(oxazoline-phosphine) ligands with different planar chiralities. Diastereoselectivities of more than 4.5/1 were obtained. As a result of their different planar chiralities, the ligands 1∼3 exhibit different coordination behaviors with PdCl2(MeCN)2.
Co-reporter:Qiupeng Hu;Dr. Zhenfeng Zhang; Yangang Liu; Tsuneo Imamoto; Wanbin Zhang
Angewandte Chemie International Edition 2015 Volume 54( Issue 7) pp:2260-2264
Publication Date(Web):
DOI:10.1002/anie.201411384

Abstract

A new catalytic system has been developed for the asymmetric hydrogenation of β-secondary-amino ketones using a highly efficient P-chiral bisphosphine–rhodium complex in combination with ZnCl2 as the activator of the catalyst. The chiral γ-secondary-amino alcohols were obtained in 90–94 % yields, 90–99 % enantioselectivities, and with high turnover numbers (up to 2000 S/C; S/C=substrate/catalyst ratio). A mechanism for the promoting effect of ZnCl2 on the catalytic system has been proposed on the basis of NMR spectroscopy and HRMS studies. This method was successfully applied to the asymmetric syntheses of three important drugs, (S)-duloxetine, (R)-fluoxetine, and (R)-atomoxetine, in high yields and with excellent enantioselectivities.

Co-reporter:Yang Xu, Zehua Yang, Boqiang Ding, Delong Liu, Yangang Liu, Masashi Sugiya, Tsuneo Imamoto, Wanbin Zhang
Tetrahedron 2015 Volume 71(Issue 38) pp:6832-6839
Publication Date(Web):23 September 2015
DOI:10.1016/j.tet.2015.07.026
An asymmetric Michael addition of diphenylphosphine to β,γ-unsaturated α-keto esters was developed using a P-stereogenic pincer-Pd complex as a catalyst. The corresponding hydrophosphination products were obtained in good yields (up to 94%) and with moderate to good enantioselectivities (up to 93% ee) under the optimum reaction conditions.
Co-reporter:Xiaohong Huo, Mao Quan, Guoqiang Yang, Xiaohu Zhao, Delong Liu, Yangang Liu, and Wanbin Zhang
Organic Letters 2014 Volume 16(Issue 6) pp:1570-1573
Publication Date(Web):March 12, 2014
DOI:10.1021/ol5000988
C–O bond cleavage of allylic alkyl ether was realized in a Pd-catalyzed hydrogen-bond-activated allylic alkylation using only alcohol solvents. This procedure does not require any additives and proceeds with high regioselectivity. The applicability of this transformation to a variety of functionalized allylic ether substrates was also investigated. Furthermore, this methodology can be easily extended to the asymmetric synthesis of enantiopure products (99% ee).
Co-reporter:Mo Wang, Zhenfeng Zhang, Fang Xie and Wanbin Zhang  
Chemical Communications 2014 vol. 50(Issue 24) pp:3163-3165
Publication Date(Web):22 Jan 2014
DOI:10.1039/C3CC49107B
An efficient methodology involving the Cu-catalyzed amidation of halogenated imidazoles has been successfully developed. The amidated product of 5-bromo-1-alkylimidazole was further applied to the synthesis of a new chiral imidazole nucleophilic catalyst for the kinetic resolution of secondary alcohols.
Co-reporter:Mingli Wang, Zhenfeng Zhang, Shan Liu, Fang Xie and Wanbin Zhang  
Chemical Communications 2014 vol. 50(Issue 10) pp:1227-1230
Publication Date(Web):26 Nov 2013
DOI:10.1039/C3CC47455K
A newly developed chiral imidazole nucleophilic catalyst, Acyloxy-DPI, was readily prepared and successfully applied to the enantioselective Black rearrangement with up to 88% ee for a wide range of substrates possessing different substituted groups. A plausible mechanism for the high enantioselectivity was proposed.
Co-reporter:Qianjin An, Jiefeng Shen, Nicholas Butt, Delong Liu, Yangang Liu, and Wanbin Zhang
Organic Letters 2014 Volume 16(Issue 17) pp:4496-4499
Publication Date(Web):August 20, 2014
DOI:10.1021/ol502033v
An asymmetric domino reaction was developed utilizing readily available cyclic N-sulfonylimines and simple aldehydes to construct biologically important and synthetically challenging piperidine derivatives consisting of three contiguous stereocenters. trans-Perhydroindolic acid proved to be an efficient organocatalyst in this reaction (up to 89% yield, 80:20 dr, and 99% ee). The absolute configuration of the catalytic product was determined by X-ray crystallography studies. The product could be conveniently converted to synthetically useful intermediates, such as (3R,4S)-4-ethyl-3-methyl-6-phenylpiperidinyridin-2-one (8), via a simple transformation.
Co-reporter:Xiaohong Huo;Dr. Guoqiang Yang; Delong Liu; Yangang Liu; Ilya D. Gridnev; Wanbin Zhang
Angewandte Chemie International Edition 2014 Volume 53( Issue 26) pp:6776-6780
Publication Date(Web):
DOI:10.1002/anie.201403410

Abstract

Allylic alcohols were directly used in Pd-catalyzed allylic alkylations of simple ketones under mild reaction conditions. The reaction proceeded smoothly at 20 °C by the concerted action of a Pd catalyst, a pyrrolidine co-catalyst, and a hydrogen-bonding solvent, and does not require any additional reagents. A computational study suggested that methanol plays a crucial role in the formation of the π-allylpalladium complex by lowering the activation barrier.

Co-reporter:Zhenni Ma, Fang Xie, Han Yu, Yiren Zhang, Xiaoting Wu and Wanbin Zhang  
Chemical Communications 2013 vol. 49(Issue 46) pp:5292-5294
Publication Date(Web):23 Apr 2013
DOI:10.1039/C3CC42088D
A highly regioselective and enantioselective copper-catalyzed 1,4-conjugate addition of Grignard reagents to linear α,β,γ,δ-unsaturated ketones was developed. The 1,4-addition products were obtained regioselectively in high yields with up to 98% ee.
Co-reporter:Chaoren Shen, Guoqiang Yang, and Wanbin Zhang
Organic Letters 2013 Volume 15(Issue 22) pp:5722-5725
Publication Date(Web):November 4, 2013
DOI:10.1021/ol402748u
The insertion of arynes into arylphosphoryl amide bonds to synchronously construct C–P and C–N bonds is described. Arynes generated in situ from o-triflate arylsilanes under fluoride-promoted conditions insert into relatively inert P–N bonds, producing o-amine-substituted arylphosphine oxides. This process provides a simple pathway for the preparation of precursors for a number of bidentate aminophosphine ligands.
Co-reporter:Boqiang Ding, Zhenfeng Zhang, Yang Xu, Yangang Liu, Masashi Sugiya, Tsuneo Imamoto, and Wanbin Zhang
Organic Letters 2013 Volume 15(Issue 21) pp:5476-5479
Publication Date(Web):October 21, 2013
DOI:10.1021/ol402627f
Novel P-stereogenic PCP pincer–Pd complexes were designed and prepared in short steps from optically pure tert-butylmethylphosphine-borane. These optically active Pd-complexes were successfully applied in asymmetric addition of diarylphosphines to nitroalkenes with high yields and good enantioselectivity.
Co-reporter:Boqiang Ding, Zhenfeng Zhang, Yangang Liu, Masashi Sugiya, Tsuneo Imamoto, and Wanbin Zhang
Organic Letters 2013 Volume 15(Issue 14) pp:3690-3693
Publication Date(Web):June 26, 2013
DOI:10.1021/ol401560q
A pincer-Pd complex was utilized in the chemoselective transfer hydrogenation of α,β-unsaturated ketones using n-BuOH as a hydrogen source and solvent. Good to excellent yields were obtained for various substrates even with reducible groups. Based on deuterium-labeling experiments, the reaction mechanism is proposed to occur via a pincer-Pd-hydride intermediate.
Co-reporter:Jiahao Wang, Delong Liu, Yangang Liu and Wanbin Zhang  
Organic & Biomolecular Chemistry 2013 vol. 11(Issue 23) pp:3855-3861
Publication Date(Web):16 Apr 2013
DOI:10.1039/C3OB40135A
Asymmetric hydrogenations of a series of β-amino ketones were carried out with a bimetallic complex (RuPHOX-Ru) as the chiral catalyst. Almost all the reactions (performed in a mixed solvent system of toluene and H2O in the presence of KOH) gave quantitative conversions into their respective products with up to 99.9% ee. The RuPHOX-Ru catalyst is stable to both moisture and air. The procedure has the benefits of being inexpensive, environmentally friendly and highly efficient. Under a relatively low catalyst loading (TON = 2000), key intermediates of fluoxetine, tomoxetine and nisoxetine could be obtained in quantitative yield and in up to 99.9% ee. This methodology represents a promising alternative to the synthesis of the aforementioned drugs and their analogues.
Co-reporter:Mao Quan, Nicholas Butt, Jiefeng Shen, Kaiji Shen, Delong Liu and Wanbin Zhang  
Organic & Biomolecular Chemistry 2013 vol. 11(Issue 42) pp:7412-7419
Publication Date(Web):30 Sep 2013
DOI:10.1039/C3OB41642A
Chiral β-aryl-α,β-unsaturated amino alcohols were synthesized via a Pd-catalyzed asymmetric allylic amination of 4-aryl-1,3-dioxolan-2-one using planar chiral 1,2-disubstituted ferrocene-based phosphinooxazolines as ligands. Under the optimized reaction conditions, a series of substrates were examined and the products were obtained in good to excellent yields (up to 92%) and enantioselectivities (up to 98% ee) under mild reaction conditions. The desired products were determined to be of (R)-configuration and could subsequently be transformed into compounds with interesting biological activity using simple transformations.
Co-reporter:Xiaolei Wang;Zhengxing Wu;Xiaowen Zhu; Chenghao Ye;Feng Jiang
Chinese Journal of Chemistry 2013 Volume 31( Issue 1) pp:132-138
Publication Date(Web):
DOI:10.1002/cjoc.201200963

Abstract

A Pd(II)-catalyzed oxidative cyclization of olefinic tosylamides was developed for the preparation of aryl-fused and N-containing six-membered heterocycles. Under optimized conditions the reaction proceeded with high activity and selectivity, with yields of up to 83% being obtained. This procedure provides a facile and efficient route to the aforementioned heterocycles with 2-acetoxy functionality.

Co-reporter:Dr. Guoqiang Yang ; Wanbin Zhang
Angewandte Chemie International Edition 2013 Volume 52( Issue 29) pp:7540-7544
Publication Date(Web):
DOI:10.1002/anie.201302861
Co-reporter:Chao Li, Jianzhong Chen, Guanghong Fu, Delong Liu, Yangang Liu, Wanbin Zhang
Tetrahedron 2013 69(33) pp: 6839-6844
Publication Date(Web):
DOI:10.1016/j.tet.2013.06.016
Co-reporter:Jianzhong Chen; Delong Liu;Dr. Nicholas Butt;Chao Li;Dongyang Fan; Yangang Liu; Wanbin Zhang
Angewandte Chemie International Edition 2013 Volume 52( Issue 44) pp:11632-11636
Publication Date(Web):
DOI:10.1002/anie.201306231
Co-reporter:Yuanyuan Liu ; Wanbin Zhang
Angewandte Chemie International Edition 2013 Volume 52( Issue 8) pp:2203-2206
Publication Date(Web):
DOI:10.1002/anie.201209126
Co-reporter:Jianzhong Chen; Delong Liu;Dr. Nicholas Butt;Chao Li;Dongyang Fan; Yangang Liu; Wanbin Zhang
Angewandte Chemie 2013 Volume 125( Issue 44) pp:11846-11850
Publication Date(Web):
DOI:10.1002/ange.201306231
Co-reporter:Yuanyuan Liu ; Wanbin Zhang
Angewandte Chemie 2013 Volume 125( Issue 8) pp:2259-2262
Publication Date(Web):
DOI:10.1002/ange.201209126
Co-reporter:Dr. Guoqiang Yang ; Wanbin Zhang
Angewandte Chemie 2013 Volume 125( Issue 29) pp:7688-7692
Publication Date(Web):
DOI:10.1002/ange.201302861
Co-reporter:Jianzhong Chen, Delong Liu, Dongyang Fan, Yangang Liu, Wanbin Zhang
Tetrahedron 2013 69(38) pp: 8161-8168
Publication Date(Web):
DOI:10.1016/j.tet.2013.07.030
Co-reporter:Guoqiang Yang and Wanbin Zhang
Organic Letters 2012 Volume 14(Issue 1) pp:268-271
Publication Date(Web):December 8, 2011
DOI:10.1021/ol203043h
A switchable regioselective intramolecular aerobic aza-Wacker cyclization catalyzed by palladium is presented. Isoindolinones or isoquinolin-1(2H)-ones could be prepared selectively from the same substrates using different catalysts. The type and steric hindrance of the ligands may be the variables most significant for regiocontrol.
Co-reporter:Jiefeng Shen;Delong Liu;Qianjin An;Yangang Liu
Advanced Synthesis & Catalysis 2012 Volume 354( Issue 17) pp:3311-3325
Publication Date(Web):
DOI:10.1002/adsc.201200456

Abstract

(2S,3aR,7aS)-Perhydroindolic acid, the key intermediate in the synthesis of trandolapril, and its trans-isomers, were readily prepared. These proline-like molecules are unique in that they contain a rigid bicyclic structure, with two hydrogen atoms trans to each other at the bridgehead carbon atoms. These molecules were used successfully as chiral organocatalysts in asymmetric domino Michael addition/cyclization reactions of aldehyde esters with β,γ-unsaturated α-keto esters. They proved to have excellent catalytic behavior, allowing for the synthesis of multi-substituted, enantiomerically enriched hemiacetal esters. Under optimal conditions (using 10 mol% catalyst loading), a series of β,γ-unsaturated α-keto esters was examined with up to 99% de, ee and yield, respectively. Additionally, the enantiomerically enriched hemiacetal esters could be readily transformed into their corresponding bioactive pyrano[2,3-b]pyrans (possessing a multi-substituted bicyclic backbone).

Co-reporter:Han Yu;Fang Xie;Zhenni Ma;Yangang Liu
Advanced Synthesis & Catalysis 2012 Volume 354( Issue 10) pp:1941-1947
Publication Date(Web):
DOI:10.1002/adsc.201101007

Abstract

A highly enantioselective copper-catalyzed conjugate addition with triethylaluminium was developed using phosphoramidite ligands bearing a D2-symmetric biphenyl backbone. For these ligands we demonstrated that the 3,3′,5,5′-substituents on the biphenyl backbone can completely reverse the absolute configuration of the products.

Co-reporter:Han Yu, Fang Xie, Zhenni Ma, Yangang Liu and Wanbin Zhang  
Organic & Biomolecular Chemistry 2012 vol. 10(Issue 26) pp:5137-5142
Publication Date(Web):08 May 2012
DOI:10.1039/C2OB25730K
A highly enantioselective copper-catalyzed conjugate addition of diethylzinc to acyclic aromatic enones was developed with phosphoramidite ligands bearing a D2-symmetric biphenyl backbone. This type of reaction demonstrated that toluene and THF solvents can completely reverse the absolute configuration of the products, thus simplifying the process of accessing either enantiomer (S: 92% ee, 94% yield; R: 99% ee, 96% yield).
Co-reporter:Lina Zhao, Jiefeng Shen, Delong Liu, Yangang Liu and Wanbin Zhang  
Organic & Biomolecular Chemistry 2012 vol. 10(Issue 14) pp:2840-2846
Publication Date(Web):07 Feb 2012
DOI:10.1039/C2OB00003B
Perhydroindolic acids, the by-products obtained in the industrial production of a trandolapril intermediate, were used as chiral organocatalysts in asymmetric Michael addition reactions of aldehydes to nitroolefins. These proline-like catalysts are unique for their rigid bicyclic structure with two H atoms attached to the bridgehead C atoms lying on the opposite side of the ring. They therefore showed high efficiency in asymmetric Michael additions of aldehydes to nitroolefins. Under the optimal conditions, excellent diastereo- and enantioselectivities (up to 99/1 dr and 98% ee) were obtained with high chemical yields for a series of aldehydes and nitroolefins using only 5 mol% catalyst loading. The methodology features easily available catalysts, high catalytic efficiency and environmentally green procedures.
Co-reporter:Chaoren Shen, Guoqiang Yang and Wanbin Zhang  
Organic & Biomolecular Chemistry 2012 vol. 10(Issue 17) pp:3500-3505
Publication Date(Web):21 Feb 2012
DOI:10.1039/C2OB25225B
A method was developed for the nickel-catalyzed phosphonylation of aryl mesylates and tosylates with H(O)PR1R2. To the best of our knowledge, this is the first example of nickel-catalyzed C–P coupling of aryl mesylates and tosylates. Most of the substrates gave moderate to good yields under our catalytic system.
Co-reporter:Jiefeng Shen;Qianjin An;Delong Liu;Yangang Liu
Chinese Journal of Chemistry 2012 Volume 30( Issue 11) pp:2681-2687
Publication Date(Web):
DOI:10.1002/cjoc.201200839

Abstract

An efficient asymmetric domino reaction of amino aldehyde to β,γ-unsaturated α-keto esters was achieved by using trans-perhydroindolic acid 1d as a chiral organocatalyst with excellent asymmetric behavior. Under the optimal reaction conditions, products with more than 99% de and up to 93% ee were obtained in high chemical yield (up to 98%) for a series of β,γ-unsaturated α-keto esters. The methodology provided an efficient route to dihydropyran derivatives containing many substituent groups (including amino groups).

Co-reporter:Hui Guo, Delong Liu, Nicholas A. Butt, Yangang Liu, Wanbin Zhang
Tetrahedron 2012 68(16) pp: 3295-3299
Publication Date(Web):
DOI:10.1016/j.tet.2012.02.075
Co-reporter:Qingchuan Liu, Ke Wen, Zhenfeng Zhang, Zhengxing Wu, Yong Jian Zhang, Wanbin Zhang
Tetrahedron 2012 68(26) pp: 5209-5215
Publication Date(Web):
DOI:10.1016/j.tet.2012.03.077
Co-reporter:Guoqiang Yang;Chaoren Shen ; Wanbin Zhang
Angewandte Chemie 2012 Volume 124( Issue 36) pp:9275-9279
Publication Date(Web):
DOI:10.1002/ange.201203693
Co-reporter:Guoqiang Yang;Chaoren Shen ; Wanbin Zhang
Angewandte Chemie International Edition 2012 Volume 51( Issue 36) pp:9141-9145
Publication Date(Web):
DOI:10.1002/anie.201203693
Co-reporter:Shan Liu, Zhenfeng Zhang, Fang Xie, Nicholas A. Butt, Li Sun, Wanbin Zhang
Tetrahedron: Asymmetry 2012 Volume 23(Issue 5) pp:329-332
Publication Date(Web):15 March 2012
DOI:10.1016/j.tetasy.2012.02.018
Co-reporter:Xiaohu Zhao ; Delong Liu ; Hui Guo ; Yangang Liu
Journal of the American Chemical Society 2011 Volume 133(Issue 48) pp:19354-19357
Publication Date(Web):November 3, 2011
DOI:10.1021/ja209373k
Hydrogen-bond-activated C–N bond cleavage of allylic amines was realized in Pd-catalyzed allylic alkylation to form the C–C bond product. The method could be expanded to a series of allylic amines and carbonyl compounds with excellent results. It provides a new and convenient access to C–C bond formation based on Pd-catalyzed allylic alkylation of allylic amines by using only inexpensive alcohol solvents.
Co-reporter:Feng Jiang, Zhengxing Wu, Guoqiang Yang, Fang Xie, Wanbin Zhang
Tetrahedron Letters 2011 Volume 52(Issue 22) pp:2844-2848
Publication Date(Web):1 June 2011
DOI:10.1016/j.tetlet.2011.03.102
Novel C2-symmetric chiral bisoxazoline ligands with a bipyridinyl backbone were prepared with ease from 3,3′-dicarbomethoxy-2,2′-bipyridine and enantiomerically pure 2-amino alcohols via a corresponding amide as intermediate. Interestingly, when these ligands were coordinated with Pd(II) and Cu(I), different complexation behaviors were found.
Co-reporter:Guoqiang Yang, Chaoren Shen, Liang Zhang, Wanbin Zhang
Tetrahedron Letters 2011 Volume 52(Issue 39) pp:5032-5035
Publication Date(Web):28 September 2011
DOI:10.1016/j.tetlet.2011.07.077
An efficient method was developed for the nickel-catalyzed phosphonylation of aryl triflates with triethyl phosphite, in which KBr as an additive promoted the SN2 catalytic step. To the best of our knowledge, this is the first example of nickel-catalyzed Arbuzov reactions of aryl triflates. Most of the substrates showed good reactivity under this catalytic system.
Co-reporter:Changqing Wang, Guoqiang Yang, Jing Zhuang, Wanbin Zhang
Tetrahedron Letters 2011 Volume 52(Issue 40) pp:5196
Publication Date(Web):5 October 2011
DOI:10.1016/j.tetlet.2011.08.001
Co-reporter:Liang Zhang, Guoqiang Yang, Chaoren Shen, Sabah Arghib, Wanbin Zhang
Tetrahedron Letters 2011 Volume 52(Issue 18) pp:2375-2378
Publication Date(Web):4 May 2011
DOI:10.1016/j.tetlet.2011.02.098
A new class of chiral dinuclear ligands with phthalazine bridged bisoxazoline scaffold was designed and prepared in convenient synthetic routes. 1H NMR analysis showed that this class of ligands could coordinate with two metal ions, either same or different. These ligands afforded good to excellent yields and enantioselectivities in Cu-catalyzed conjugate addition of ZnEt2 to enones.
Co-reporter:Yuanyuan Liu, Dongmei Yao, Kun Li, Fengtao Tian, Fang Xie, Wanbin Zhang
Tetrahedron 2011 67(44) pp: 8445-8450
Publication Date(Web):
DOI:10.1016/j.tet.2011.09.023
Co-reporter:Bo Yang, Fang Xie, Han Yu, Kaiji Shen, Zhenni Ma, Wanbin Zhang
Tetrahedron 2011 67(34) pp: 6197-6201
Publication Date(Web):
DOI:10.1016/j.tet.2011.06.059
Co-reporter:Feng Jiang, Zhengxing Wu, Wanbin Zhang
Tetrahedron 2011 67(7) pp: 1501-1505
Publication Date(Web):
DOI:10.1016/j.tet.2010.12.017
Co-reporter:YuanYuan Liu;GuoQiang Yang;DongMei Yao;FengTao Tian
Science China Chemistry 2011 Volume 54( Issue 1) pp:87-94
Publication Date(Web):2011 January
DOI:10.1007/s11426-010-4172-z
Tropos phosphine-oxazoline ligands have shown interesting coordination behavior and excellent chiral inducing ability in asymmetry catalysis. Here we present a convenient and economic route for the synthesis of this type of ligands. According to this new route, the ligands with different electronic and steric properties have been prepared successfully.
Co-reporter:Zhenfeng Zhang ; Fang Xie ; Jia Jia
Journal of the American Chemical Society 2010 Volume 132(Issue 45) pp:15939-15941
Publication Date(Web):October 26, 2010
DOI:10.1021/ja109069k
A new type of chiral bicycle imidazole nucleophilic catalyst was rationally designed, facilely synthesized, and successfully applied in an asymmetric Steglich rearrangement with good to excellent yield and enantioselectivity at ambient temperature. Moreover, it can be easily recycled with almost no reduction of catalytic efficiency. This is the first example for the successful chiral imidazole nucleophilic catalyst without H-bonding assistance.
Co-reporter:Fengtao Tian;Dongmei Yao;Yuanyuan Liu;Fang Xie
Advanced Synthesis & Catalysis 2010 Volume 352( Issue 11-12) pp:1841-1845
Publication Date(Web):
DOI:10.1002/adsc.201000185

Abstract

By using the iridium complex of a phosphine-oxazoline ligand with an axis-unfixed biphenyl backbone, a highly enantioselective hydrogenation of the CC bond of exocyclic α,β-unsaturated carbonyl compounds to afford α-chiral cyclic ketones, lactones and lactams was developed.

Co-reporter:Hui Zhang, Fang Fang, Fang Xie, Han Yu, Guoqiang Yang, Wanbin Zhang
Tetrahedron Letters 2010 Volume 51(Issue 23) pp:3119-3122
Publication Date(Web):9 June 2010
DOI:10.1016/j.tetlet.2010.04.033
Atropos phosphoramidites with the D2-symmetric biphenyl backbone were diastereoselectively prepared with ease from achiral tetrahydroxy biphenyls. This type of ligands is proved to be highly efficient in the Cu-catalyzed conjugate additions of diethylzinc to α,β-unsaturated ketones and nitroalkenes. The unique D2-symmetric backbone endows the ligands with an excellent chiral environment.
Co-reporter:Changqing Wang, Guoqiang Yang, Jing Zhuang, Wanbin Zhang
Tetrahedron Letters 2010 Volume 51(Issue 15) pp:2044-2047
Publication Date(Web):14 April 2010
DOI:10.1016/j.tetlet.2010.02.055
Co-reporter:Feng Jiang, Zhengxing Wu, Wanbin Zhang
Tetrahedron Letters 2010 Volume 51(Issue 39) pp:5124-5126
Publication Date(Web):29 September 2010
DOI:10.1016/j.tetlet.2010.07.084
The Pd-catalyzed asymmetric aza-Wacker-type cyclization reaction of the olefinic tosylamides with molecular oxygen as the green oxidant was developed. Under the optimized conditions, excellent catalytic activity and good enantioselectivity with up to 74% ee were obtained with quinolineoxazoline ligands. This reaction provides direct and easy access to chiral nitrogen-containing heterocycles which retain the olefin functionality.
Co-reporter:Yuanhui Ma, Shangbin Jin, Yuhe Kan, Yong Jian Zhang, Wanbin Zhang
Tetrahedron 2010 66(21) pp: 3849-3854
Publication Date(Web):
DOI:10.1016/j.tet.2010.03.042
Co-reporter:Fang Fang, Hui Zhang, Fang Xie, Guoqiang Yang, Wanbin Zhang
Tetrahedron 2010 66(20) pp: 3593-3598
Publication Date(Web):
DOI:10.1016/j.tet.2010.03.031
Co-reporter:Yuanhui Ma, Yong Jian Zhang, Shangbin Jin, Qiqi Li, Chenguang Li, Junseong Lee, Wanbin Zhang
Tetrahedron Letters 2009 50(52) pp: 7388-7391
Publication Date(Web):
DOI:10.1016/j.tetlet.2009.10.067
Co-reporter:Jing Zhuang, Changqing Wang, Fang Xie, Wanbin Zhang
Tetrahedron 2009 65(47) pp: 9797-9800
Publication Date(Web):
DOI:10.1016/j.tet.2009.09.076
Co-reporter:Xiaohu Zhao, Delong Liu, Fang Xie, Wanbin Zhang
Tetrahedron 2009 65(2) pp: 512-517
Publication Date(Web):
DOI:10.1016/j.tet.2008.11.003
Co-reporter:Yong Jian Zhang, Hao Wei, Wanbin Zhang
Tetrahedron 2009 65(7) pp: 1281-1286
Publication Date(Web):
DOI:10.1016/j.tet.2008.12.056
Co-reporter:Yanlan Wang, Delong Liu, Qinghua Meng, Wanbin Zhang
Tetrahedron: Asymmetry 2009 Volume 20(Issue 21) pp:2510-2512
Publication Date(Web):4 November 2009
DOI:10.1016/j.tetasy.2009.10.015
Ruthenocenyl phosphinooxazoline ligands have been shown to be highly efficient catalysts in the asymmetric hydrogenation. Both simple aromatic and heteroaromatic ketones were examined and excellent conversions and enantioselectivities were achieved.
Co-reporter:Fengtao Tian, Dongmei Yao, Yong Jian Zhang, Wanbin Zhang
Tetrahedron 2009 65(46) pp: 9609-9615
Publication Date(Web):
DOI:10.1016/j.tet.2009.09.053
Co-reporter:Fang Fang, Fang Xie, Han Yu, Hui Zhang, Bo Yang, Wanbin Zhang
Tetrahedron Letters 2009 50(48) pp: 6672-6675
Publication Date(Web):
DOI:10.1016/j.tetlet.2009.09.078
Co-reporter:Hao Wei, Yong Jian Zhang, Feijun Wang, Wanbin Zhang
Tetrahedron: Asymmetry 2008 Volume 19(Issue 4) pp:482-488
Publication Date(Web):4 March 2008
DOI:10.1016/j.tetasy.2008.01.023
A new type of atropisomeric bisphosphine ligand 2 with a bridge across the 5,5′-position of the biphenyl has been developed. The axial chirality of this type of ligands can be retained by macrocyclic ring strain produced from 5,5′-linkage of the biphenyl even without 6,6′-substituents on the biphenyls. Ligand (R)-2a showed good catalytic activity and enantioselectivity for Rh(I)-catalyzed asymmetric hydrogenation of (Z)-α-acetamidocinnamic acid 11.(R)-(−)-2,2′-Bis(diphenylphosphinomethyl)-5,5′-(octamethylenedioxy)-1,1′-biphenyl dioxideC46H46O4P2[α]D25=-34.1 (c 1, CHCl3)Source of chirality: resolution by chiral preparative HPLCAbsolute configuration: (R)(S)-(+)-2,2′-Bis(diphenylphosphinomethyl)-5,5′-(octamethylenedioxy)-1,1′-biphenyl dioxideC46H46O4P2[α]D25=+33.8 (c 1, CHCl3)Source of chirality: resolution by chiral preparative HPLCAbsolute configuration: (S)(R)-(−)-2,2′-Bis(diphenylphosphinomethyl)-5,5′-(decamethylenedioxy)-1,1′-biphenyl dioxideC48H50O4P2[α]D25=-37.5 (c 1.1, CHCl3)Source of chirality: resolution by chiral preparative HPLCAbsolute configuration: (R)(S)-(+)-2,2′-Bis(diphenylphosphinomethyl)-5,5′-(decamethylenedioxy)-1,1′-biphenyl dioxideC48H50O4P2[α]D25=+36.8 (c 1.1, CHCl3)Source of chirality: optical resolution by chiral preparative HPLCAbsolute configuration: (S)(R)-(−)-2,2′-Bis(diphenylphosphinomethyl)-5,5′-(octamethylenedioxy)-1,1′-biphenylC46H46O2P2[α]D25=-28.6 (c 1, CHCl3)Source of chirality: asymmetric synthesisAbsolute configuration: (R)(S)-(+)-2,2′-Bis(diphenylphosphinomethyl)-5,5′-(octamethylenedioxy)-1,1′-biphenylC46H46O2P2[α]D25=+29.8 (c 1, CHCl3)Source of chirality: asymmetric synthesisAbsolute configuration: (S)(S)-(+)-2,2′-Bis(diphenylphosphinomethyl)-5,5′-(decamethylenedioxy)-1,1′-biphenylC48H50O2P2[α]D25=+32.8 (c 1, CHCl3)Source of chirality: asymmetric synthesisAbsolute configuration: (S)(R)-(−)-2,2′-Bis(diphenylphosphinomethyl)-5,5′-(decamethylenedioxy)-1,1′-biphenylC48H50O2P2[α]D25=-31.5 (c 1.1, CHCl3)Source of chirality: asymmetric synthesisAbsolute configuration: (R)
Co-reporter:Wanbin Zhang, Fang Xie, Shigeaki Matsuo, Yuji Imahori, Toshiyuki Kida, Yohji Nakatsuji, Isao Ikeda
Tetrahedron: Asymmetry 2006 Volume 17(Issue 5) pp:767-777
Publication Date(Web):6 March 2006
DOI:10.1016/j.tetasy.2006.02.014
The synthesis of novel C2-symmetric bisoxazoline ligands with an axial-unfixed biaryl backbone and different substituents at the oxazoline ring is reported. The diastereomer equilibrium of these ligands in solution and their complexation behavior with the copper(I) ion were studied. Their application in Cu-catalyzed cyclopropanation of styrene, with diazoacetate, was carried out and the effects of the biaryl backbone and the substituent on the oxazoline ring in the catalysis were examined. The best result was obtained with the ligand having a 1,1′-binaphthyl backbone and a t-butyl group on the oxazoline ring, which afforded 89% de and 96% de for the trans- and cis-products of the above asymmetric cyclopropanation reaction, respectively.3,3′-Bis[(4′S)-tert-Butyloxazolin-2′-yl]-2,2′-binaphthylC34H36N2O2[α]D9=-78.5 (c 0.5, CHCl3)Source of chirality: (S)-(+)-leucinolAbsolute configuration: (S)5,5′-Dichloro-2,2′-bis[(4′S)-tert-butyloxazolin-2′-yl]-1,1′-biphenylC26H30Cl2N2O2[α]D13=-96.6 (c 0.5, CHCl3)Source of chirality: (S)-(+)-leucinolAbsolute configuration: (S)5,5′-Diphenyl-2,2′-bis[(4′S)-isopropyloxazolin-2′-yl]-1,1′-biphenylC36H36N2O2[α]D13=-59.0 (c 0.5, CHCl3)Source of chirality: (S)-(+)-valinolAbsolute configuration: (S)2,2′-Bis[(4′R)-(hydroxymethyl)oxazolin-2′-yl]-1,1′-biphenylC20H20N2O4[α]D9=+53.4 (c 0.51, CHCl3)Source of chirality: l-serine methyl esterAbsolute configuration: (R)2,2′-Bis[(4′R)-(methoxymethyl)oxazolin-2′-yl]-1,1′-biphenylC22H24N2O4[α]D9=+150.5 (c 0.49, CHCl3)Source of chirality: l-serine methyl esterAbsolute configuration: (R)2,2′-Bis[(4′R)-(ethoxymethyl)oxazolin-2′-yl]-1,1′-biphenylC24H28N2O4[α]D9=+116.4 (c 0.51, CHCl3)Source of chirality: l-serine methyl esterAbsolute configuration: (R)2,2′-Bis[(4′S)-(dimethylhydroxymethyl)oxazolin-2′-yl]-1,1′-biphenylC24H28N2O4[α]D27=+71.2 (c 0.70, CHCl3)Source of chirality: l-serine methyl esterAbsolute configuration: (S)2,2′-Bis[(4′S)-(dimethylmethoxymethyl)oxazolin-2′-yl]-1,1′-biphenylC26H32N2O4[α]D10=+11.9 (c 0.50, CHCl3)Source of chirality: l-serine methyl esterAbsolute configuration: (S)
Co-reporter:Changrui Xu, Zhengxing Wu, Jianzhong Chen, Fang Xie, Wanbin Zhang
Tetrahedron (6 April 2017) Volume 73(Issue 14) pp:
Publication Date(Web):6 April 2017
DOI:10.1016/j.tet.2017.02.040
A method for the preparation of indolines via palladium-catalyzed aerobic intramolecular allylic CH activation was developed. Oxygen was successfully used as oxidant with catalytic amount of 1,4-benzoquinone. 16 examples were reported, the majority of substrates gave moderate to good yields.Download high-res image (112KB)Download full-size image
Co-reporter:Mao Quan, Liang Tang, Jiaqi Shen, Guoqiang Yang and Wanbin Zhang
Chemical Communications 2017 - vol. 53(Issue 3) pp:NaN612-612
Publication Date(Web):2016/12/07
DOI:10.1039/C6CC08759K
A Ni(II)-catalyzed asymmetric addition of arylboronic acids to cyclic aldimines and ketimines is reported. Our tropos phosphine-oxazoline biphenyl ligand is crucial for the high catalytic activity, which coordinates to Ni(II) to form a complex with a single axial configuration. The desired chiral amine products could be prepared with excellent yields (up to 99%) and enantioselectivities (up to 99.8%) under mild reaction conditions.
Co-reporter:Ke Meng;Jingzhao Xia;Yanzhao Wang;Xinghua Zhang;Guoqiang Yang
Inorganic Chemistry Frontiers 2017 - vol. 4(Issue 8) pp:
Publication Date(Web):2017/07/26
DOI:10.1039/C7QO00248C
An efficient asymmetric hydrogenation of 3-substituted 2,5-dihydropyrroles using an Ir catalyst with an axially flexible chiral phosphine-oxazoline ligand was developed and chiral 3-substituted pyrrolidines could be prepared with excellent ee. 3-Substituted 2,5-dihydrothiophene 1,1-dioxides could also be hydrogenated by our catalyst, giving the desired products with moderate to high enantioselectivities.
Co-reporter:Zheng Ling, Sonia Singh, Fang Xie, Liang Wu and Wanbin Zhang
Chemical Communications 2017 - vol. 53(Issue 39) pp:NaN5367-5367
Publication Date(Web):2017/04/12
DOI:10.1039/C7CC02159C
A Cu-catalyzed asymmetric alkynylation of cyclic N-sulfonyl ketimines was developed, providing the corresponding chiral α-tertiary amines with up to 98% ee. The method tolerates some variations in cyclic N-sulfonyl ketimine and alkyne scope. These products could be used in several transformations, in particular, the products of 6-membered cyclic N-sulfonyl ketimines could be easily converted to linear chiral α-tertiary amines. This asymmetric alkynylation provides an efficient, gram-scale, low-cost transition-metal catalyzed synthesis of chiral α-tetrasubstituted propargylamines.
Co-reporter:Jiahao Wang, Delong Liu, Yangang Liu and Wanbin Zhang
Organic & Biomolecular Chemistry 2013 - vol. 11(Issue 23) pp:NaN3861-3861
Publication Date(Web):2013/04/16
DOI:10.1039/C3OB40135A
Asymmetric hydrogenations of a series of β-amino ketones were carried out with a bimetallic complex (RuPHOX-Ru) as the chiral catalyst. Almost all the reactions (performed in a mixed solvent system of toluene and H2O in the presence of KOH) gave quantitative conversions into their respective products with up to 99.9% ee. The RuPHOX-Ru catalyst is stable to both moisture and air. The procedure has the benefits of being inexpensive, environmentally friendly and highly efficient. Under a relatively low catalyst loading (TON = 2000), key intermediates of fluoxetine, tomoxetine and nisoxetine could be obtained in quantitative yield and in up to 99.9% ee. This methodology represents a promising alternative to the synthesis of the aforementioned drugs and their analogues.
Co-reporter:Yufeng Liu, Jianzhong Chen, Zhenfeng Zhang, Jian Qin, Min Zhao and Wanbin Zhang
Organic & Biomolecular Chemistry 2016 - vol. 14(Issue 29) pp:NaN7102-7102
Publication Date(Web):2016/06/28
DOI:10.1039/C6OB00871B
A one-pot sequential asymmetric hydrogenation of β-aryl-β-aryloxy acroleins has been realized for the preparation of chiral 3-aryl-3-aryloxy alcohols with excellent yields and good enantioselectivities. This methodology can be employed in new synthetic routes for the synthesis of fluoxetine, atomoxetine, and related analogues.
Co-reporter:Zehua Yang, Chao Xia, Delong Liu, Yangang Liu, Masashi Sugiya, Tsuneo Imamoto and Wanbin Zhang
Organic & Biomolecular Chemistry 2015 - vol. 13(Issue 9) pp:NaN2702-2702
Publication Date(Web):2015/01/05
DOI:10.1039/C4OB02402H
A new P-stereogenic PNP pincer-Pd complex was readily prepared from optically pure 2,6-bis[(boranato(tert-butyl)methylphosphino)methyl]pyridine. It was used in the asymmetric intramolecular hydroamination of amino-1,3-dienes, with the desired products being obtained in good yields and with excellent regioselectivities and up to moderate enantioselectivities. The absolute configuration of one of the hydroamination products was determined by X-ray crystallography studies. This simple and efficient procedure can be used for the synthesis of allyl-type chiral pyrrolidine derivatives.
Co-reporter:Mo Wang, Zhenfeng Zhang, Fang Xie and Wanbin Zhang
Chemical Communications 2014 - vol. 50(Issue 24) pp:NaN3165-3165
Publication Date(Web):2014/01/22
DOI:10.1039/C3CC49107B
An efficient methodology involving the Cu-catalyzed amidation of halogenated imidazoles has been successfully developed. The amidated product of 5-bromo-1-alkylimidazole was further applied to the synthesis of a new chiral imidazole nucleophilic catalyst for the kinetic resolution of secondary alcohols.
Co-reporter:Nicholas A. Butt and Wanbin Zhang
Chemical Society Reviews 2015 - vol. 44(Issue 22) pp:NaN7967-7967
Publication Date(Web):2015/08/21
DOI:10.1039/C5CS00144G
The transition metal-catalyzed allylic substitution of unactivated allylic substrates (allylic alcohols, allylic ethers and allylic amines) is rapidly becoming an important area of research. There are several advantages to using these substrates in allylic substitution reactions: the use of unactivated alcohols minimizes the production of waste by-products and reaction steps; and allylic ethers and allylic amines are useful substrates because of their stability and their presence in numerous biologically active compounds. Research in this field has therefore gained widespread attention for promoting the development of efficient and environmentally benign procedures for the formation of C–C, C–N and C–O bonds.
Co-reporter:Chaoren Shen, Guoqiang Yang and Wanbin Zhang
Organic & Biomolecular Chemistry 2012 - vol. 10(Issue 17) pp:NaN3505-3505
Publication Date(Web):2012/02/21
DOI:10.1039/C2OB25225B
A method was developed for the nickel-catalyzed phosphonylation of aryl mesylates and tosylates with H(O)PR1R2. To the best of our knowledge, this is the first example of nickel-catalyzed C–P coupling of aryl mesylates and tosylates. Most of the substrates gave moderate to good yields under our catalytic system.
Co-reporter:Zhenni Ma, Fang Xie, Han Yu, Yiren Zhang, Xiaoting Wu and Wanbin Zhang
Chemical Communications 2013 - vol. 49(Issue 46) pp:NaN5294-5294
Publication Date(Web):2013/04/23
DOI:10.1039/C3CC42088D
A highly regioselective and enantioselective copper-catalyzed 1,4-conjugate addition of Grignard reagents to linear α,β,γ,δ-unsaturated ketones was developed. The 1,4-addition products were obtained regioselectively in high yields with up to 98% ee.
Co-reporter:Lina Zhao, Jiefeng Shen, Delong Liu, Yangang Liu and Wanbin Zhang
Organic & Biomolecular Chemistry 2012 - vol. 10(Issue 14) pp:NaN2846-2846
Publication Date(Web):2012/02/07
DOI:10.1039/C2OB00003B
Perhydroindolic acids, the by-products obtained in the industrial production of a trandolapril intermediate, were used as chiral organocatalysts in asymmetric Michael addition reactions of aldehydes to nitroolefins. These proline-like catalysts are unique for their rigid bicyclic structure with two H atoms attached to the bridgehead C atoms lying on the opposite side of the ring. They therefore showed high efficiency in asymmetric Michael additions of aldehydes to nitroolefins. Under the optimal conditions, excellent diastereo- and enantioselectivities (up to 99/1 dr and 98% ee) were obtained with high chemical yields for a series of aldehydes and nitroolefins using only 5 mol% catalyst loading. The methodology features easily available catalysts, high catalytic efficiency and environmentally green procedures.
Co-reporter:Mao Quan, Nicholas Butt, Jiefeng Shen, Kaiji Shen, Delong Liu and Wanbin Zhang
Organic & Biomolecular Chemistry 2013 - vol. 11(Issue 42) pp:NaN7419-7419
Publication Date(Web):2013/09/30
DOI:10.1039/C3OB41642A
Chiral β-aryl-α,β-unsaturated amino alcohols were synthesized via a Pd-catalyzed asymmetric allylic amination of 4-aryl-1,3-dioxolan-2-one using planar chiral 1,2-disubstituted ferrocene-based phosphinooxazolines as ligands. Under the optimized reaction conditions, a series of substrates were examined and the products were obtained in good to excellent yields (up to 92%) and enantioselectivities (up to 98% ee) under mild reaction conditions. The desired products were determined to be of (R)-configuration and could subsequently be transformed into compounds with interesting biological activity using simple transformations.
Co-reporter:Han Yu, Fang Xie, Zhenni Ma, Yangang Liu and Wanbin Zhang
Organic & Biomolecular Chemistry 2012 - vol. 10(Issue 26) pp:NaN5142-5142
Publication Date(Web):2012/05/08
DOI:10.1039/C2OB25730K
A highly enantioselective copper-catalyzed conjugate addition of diethylzinc to acyclic aromatic enones was developed with phosphoramidite ligands bearing a D2-symmetric biphenyl backbone. This type of reaction demonstrated that toluene and THF solvents can completely reverse the absolute configuration of the products, thus simplifying the process of accessing either enantiomer (S: 92% ee, 94% yield; R: 99% ee, 96% yield).
Co-reporter:Hongwei Wu, Fang Xie, Yanlan Wang, Xiaohu Zhao, Delong Liu and Wanbin Zhang
Organic & Biomolecular Chemistry 2015 - vol. 13(Issue 14) pp:NaN4254-4254
Publication Date(Web):2015/02/24
DOI:10.1039/C5OB00032G
Compared to their C1-symmetric counterparts, planar chiral C2-symmetric metallocenyl P,N-ligands are efficient chiral ligands for Pd-catalyzed asymmetric allylic aminations, providing a number of amination products with high enantioselectivities. A non-C2-symmetric ferrocenyl P,N-ligand (a by-product obtained during the synthesis of the above C2-symmetric species) was also found to be an efficient ligand for asymmetric allylic aminations. A mixed ligand system consisting of both C2- and non-C2-symmetric ferrocene complexes was examined and showed high catalytic activity with the amination products being obtained with excellent enantioselectivities.
Co-reporter:Mingli Wang, Zhenfeng Zhang, Shan Liu, Fang Xie and Wanbin Zhang
Chemical Communications 2014 - vol. 50(Issue 10) pp:NaN1230-1230
Publication Date(Web):2013/11/26
DOI:10.1039/C3CC47455K
A newly developed chiral imidazole nucleophilic catalyst, Acyloxy-DPI, was readily prepared and successfully applied to the enantioselective Black rearrangement with up to 88% ee for a wide range of substrates possessing different substituted groups. A plausible mechanism for the high enantioselectivity was proposed.
Co-reporter:Qianjia Yuan, Kun Yao, Delong Liu and Wanbin Zhang
Chemical Communications 2015 - vol. 51(Issue 59) pp:NaN11836-11836
Publication Date(Web):2015/06/12
DOI:10.1039/C5CC04085J
An efficient Ir-catalyzed allyl–allyl cross-coupling reaction of allylic carbonates with (E)-1,3-diarylpropenes was developed to form linear allylated products, 1,5-dienes, regioselectively in excellent yields and with high turnover numbers (up to 2000 S/Ir).
Co-reporter:Qianjin An, Jing Li, Jiefeng Shen, Nicholas Butt, Delong Liu, Yangang Liu and Wanbin Zhang
Chemical Communications 2015 - vol. 51(Issue 5) pp:NaN888-888
Publication Date(Web):2014/11/20
DOI:10.1039/C4CC07051H
An organocatalyzed asymmetric tandem reaction of cyclic N-sulfonylimines and α,β-unsaturated aldehydes was developed. These substrates follow an alternative reaction pathway to that of reactions involving saturated aldehydes, affording similar piperidine derivatives.
Oxazole, 2-[2'-[bis[4-(trifluoromethyl)phenyl]phosphino][1,1'-biphenyl]-2-yl]-4,5-dihydro-4-phenyl-, (4S)-
Oxazole, 2,2',2'',2'''-[1,1'-biphenyl]-2,2',6,6'-tetrayltetrakis[4,5-dihydro-4-phenyl-, (4S,4'S,4''S,4'''S)-
Oxazole,4-(1,1-dimethylethyl)-2-[(1R)-2'-(diphenylphosphino)[1,1'-binaphthalen]-2-yl]-4,5-dihydro-, (4S)-
(7R)-6,7-dihydro-7-methoxy-5H-Pyrrolo[1,2-a]imidazole
(7R)-7-ethoxy-6,7-dihydro-5H-Pyrrolo[1,2-a]imidazole
Oxazole, 2,2',2'',2'''-[1,1'-biphenyl]-2,2',6,6'-tetrayltetrakis[4-(1,1-dimethylethyl)-4,5-dihydro-, (4S,4'S,4''S,4'''S)-
1H-Indole-2-carboxylicacid, octahydro-, (2R,3aS,7aR)-
Oxazole, 2,2',2'',2'''-[1,1'-biphenyl]-2,2',6,6'-tetrayltetrakis[4,5-dihydro-4-(1-methylethyl)-, (4S,4'S,4''S,4'''S)-