Co-reporter:Shangbiao Feng;Tao Li;Chenglong Du;Peng Chen;Dengpeng Song;Jinlai Li;Xingang Xie
Chemical Communications 2017 vol. 53(Issue 33) pp:4585-4588
Publication Date(Web):2017/04/20
DOI:10.1039/C7CC01813D
A visible-light promoted single electron oxidation of ether enabled by photoredox catalysis has been accomplished. This procedure initiates a novel radical insertion/cyclization cascade reaction to generate phenanthridines and isoquinolines from easily available isocyanides under mild reaction conditions.
Co-reporter:Shangbiao Feng;Jinlai Li;Zaimin Liu;Haiyu Sun;Hongliang Shi;Xiaolei Wang;Xingang Xie
Organic & Biomolecular Chemistry 2017 vol. 15(Issue 41) pp:8820-8826
Publication Date(Web):2017/10/25
DOI:10.1039/C7OB02199B
A visible-light-mediated radical addition of alkynoates to generate 3-bromocoumarins by using N-bromosuccinimide as the bromo source has been accomplished. This procedure provides a bromo radical addition/spirocyclization/ester migration cascade reaction under very mild reaction conditions without using any catalyst or strong oxidant and does not need high reaction temperature. Furthermore, the reaction can also be enlarged to the gram scale, and the product 3-bromocoumarins can be further applied in the synthesis of complex compounds.
Co-reporter:Hao Zhang;Shiqiang Ma;Zhimin Xing;Lin Liu;Bowen Fang;Xingang Xie
Organic Chemistry Frontiers 2017 vol. 4(Issue 11) pp:2211-2215
Publication Date(Web):2017/10/24
DOI:10.1039/C7QO00550D
A tandem radical cyclization reaction towards the 6/6/5 fused tricyclic skeleton, which exists in numerous natural products, was developed in modest to good yields. In this transformation, two C–C bonds and two rings were formed successively via a tandem 5-exo-trig/6-endo-trig cyclization reaction. 5-epi-7-deoxy-Isoabietenin A was also synthesized efficiently via this strategy.
Co-reporter:Donghui Ma, Zhuliang Zhong, Zaimin Liu, Mingjie Zhang, Shiyan Xu, Dengyu Xu, Dengpeng Song, Xingang Xie, and Xuegong She
Organic Letters 2016 Volume 18(Issue 17) pp:4328-4331
Publication Date(Web):August 16, 2016
DOI:10.1021/acs.orglett.6b02072
A protecting-group-free route for the total synthesis of (−)-lycopodine was demonstrated in only 8 steps from Wade’s fawcettimine enone (12 steps from commercial availiable (R)-(+)-pulegone). The key core of this alkaloid was constructed through a phosphoric acid promoted and highly stereocontrolled alkyne aza-Prins cyclization reaction, synchronously establishing the bridged B-ring and the C13 quaternary stereocenter. Importantly, the synthesis further features a new efficient approach for the preparation of other lycopodine-type alkaloids.
Co-reporter:Dengpeng Song, Zhengshen Wang, Ruoming Mei, Weiwei Zhang, Donghui Ma, Dengyu Xu, Xingang Xie, and Xuegong She
Organic Letters 2016 Volume 18(Issue 4) pp:669-671
Publication Date(Web):February 5, 2016
DOI:10.1021/acs.orglett.6b00005
The first total synthesis of the Myrioneuron alkaloids (±)-α,β-myrifabral A and B has been accomplished in only four steps from conveniently available starting materials. This short synthesis relied on the use of a key tandem Mannich/amidation reaction to rapidly construct the core framework and two carbon stereocenters. The synthetic route allows for large scale preparation of these promising natural products against the hepatitis C virus (HCV).
Co-reporter:Shiyan Xu, Jing Zhang, Donghui Ma, Dengyu Xu, Xingang Xie, and Xuegong She
Organic Letters 2016 Volume 18(Issue 18) pp:4682-4685
Publication Date(Web):August 26, 2016
DOI:10.1021/acs.orglett.6b02322
The first asymmetric total synthesis of the structurally unique Lycopodium alkaloid (−)-lycospidine A, containing an unprecedented five-membered ring, has been accomplished in only 10 steps with 21.6% overall yield from the known conveniently available sulfoxide. This protecting-group-free short synthesis relied on the use of a key amidation/aza-Prins domino cyclization reaction to rapidly construct the tricyclic skeleton and two continuous stereocenters (one of which is a bridged quaternary stereocenter). An intramolecular aldol condensation was successfully utilized to establish the unique five-membered ring, and a late-stage oxidation inspired by biosynthesis pathway was adopted to synthesize the diosphenol ring of (−)-lycospidine A.
Co-reporter:Gaoyuan Zhao, Xingang Xie, Haiyu Sun, Ziyun Yuan, Zhuliang Zhong, Shouchu Tang, and Xuegong She
Organic Letters 2016 Volume 18(Issue 10) pp:2447-2450
Publication Date(Web):May 10, 2016
DOI:10.1021/acs.orglett.6b00989
We present the application of a bioinspired collective synthesis strategy in the total syntheses of seven iboga-type indole alkaloids: (±)-tabertinggine, (±)-ibogamine, (±)-ibogaine, (±)-ibogaine hydroxyindolenine, (±)-3-oxoibogaine hydroxyindolenine, (±)-iboluteine, and (±)-ervaoffines D. In particular, tabertinggine and its congeners serve as iboga precursors for the subsequent biomimetic transformations into other iboga-type alkaloids.
Co-reporter:Shiyan Xu;Mingjie Zhang;Weiwei Zhang;Dr. Xingang Xie;Dr. Xuegong She
Asian Journal of Organic Chemistry 2016 Volume 5( Issue 8) pp:986-990
Publication Date(Web):
DOI:10.1002/ajoc.201600209
Abstract
The first enantioselective total synthesis of the bisnorditerpene (+)-(5β,8α,10α)-8-hydroxy-13-methylpodocarpa-9(11),13-diene-3,12-dione (1) was accomplished in 7 steps with 18.5 % overall yield from known aldehyde and chiral epoxide. Key steps of the synthesis include a cationic domino cyclization used to construct the [6,6,6] fused framework, and an oxidative dearomatization reaction used to form the 1,4-quinoid moiety.
Co-reporter:Runfeng Han;Liwenze He;Lin Liu;Xingang Xie;Dr. Xuegong She
Chemistry – An Asian Journal 2016 Volume 11( Issue 2) pp:193-197
Publication Date(Web):
DOI:10.1002/asia.201500959
Abstract
A sequential reaction combining N-heterocyclic carbene (NHC) and N-hydroxyphthalimide (NHPI) catalysis allowed for the upstream by-product NHPI, which was generated in the NHC-catalyzed cycloaddition reaction, to act as the catalyst for a downstream nitrogen-to-carbon sulfonyl migration reaction. Enantiomeric excess of the major product in the cycloaddition reaction remained intact in the follow-up sulfonyl migration reaction.
Co-reporter:Zhuliang Zhong;Gaoyuan Zhao;Dengyu Xu;Baobiao Dong;Dengpeng Song;Dr. Xingang Xie;Dr. Xuegong She
Chemistry – An Asian Journal 2016 Volume 11( Issue 10) pp:1542-1547
Publication Date(Web):
DOI:10.1002/asia.201600398
Abstract
The first bioinspired total syntheses of (−) kravanhins A and C were accomplished from a labdane diterpenoid derivative. The key reactions involve a photooxidation and a one-pot sequential aldol cyclization and lactonization, which provide a new plausible biosynthetic pathway for the kravanhins and other symbiotic members.
Co-reporter:Ruoming Mei, Dengyu Xu, Haitao Hu, Dengpeng Song, Hao Zhang, Donghui Ma, Xingang Xie, and Xuegong She
Organic Letters 2015 Volume 17(Issue 9) pp:2230-2233
Publication Date(Web):April 17, 2015
DOI:10.1021/acs.orglett.5b00846
The first asymmetric total syntheses of (+)-dihydrolyfoline and (−)-5-epi-dihydrolyfoline have been achieved in five and six steps with 4.6% and 14% overall yields, respectively, in which the chiral biaryl axes were constructed in a highly regioselective and stereoselective manner via a biogenetic enzymatic oxidative couplings of phenols, and the requisite quinolizidinone cores were prepared by an enzymatic Mannich reaction.
Co-reporter:Gaoyuan Zhao, Min He, Huilin Li, Shuangshuang Duan, Ziyun Yuan, Xingang Xie and Xuegong She
Chemical Communications 2015 vol. 51(Issue 97) pp:17321-17323
Publication Date(Web):06 Oct 2015
DOI:10.1039/C5CC06923H
Domino intramolecular Diels–Alder (IMDA) reactions towards the 6/6/5/5 fused tetracyclic natural products were developed in satisfactory yield and high stereoselectivity. Four rings, six contiguous stereocenters and four C–C bonds were formed in a single operation. 4-epi-Hydromitchellene B was also synthesised efficiently via this strategy.
Co-reporter:Haichen Ma, Xingang Xie, Peng Jing, Weiwei Zhang and Xuegong She
Organic & Biomolecular Chemistry 2015 vol. 13(Issue 18) pp:5255-5259
Publication Date(Web):24 Mar 2015
DOI:10.1039/C5OB00228A
(±)-Aspidospermidine (1) has been synthesized from the commercially available 2,3-dihydro-1H-carbazol-4(9H)-one 6 in 10 steps with 20% overall yield. The key step of the strategy is a one-pot carbonyl reduction/iminium formation/intramolecular conjugate addition reaction that may be applied for the synthesis of other Aspidosperma alkaloids.
Co-reporter:Zhuliang Zhong;Donghui Ma;Gaoyuan Zhao;Huilin Li;Dengyu Xu;Dr. Xingang Xie;Dr. Xuegong She
Chemistry – An Asian Journal 2015 Volume 10( Issue 12) pp:2599-2603
Publication Date(Web):
DOI:10.1002/asia.201500860
Abstract
The first asymmetric total synthesis of kravanhin B has been accomplished with a linear reaction sequence of 13 steps starting from (R)-(−)-carvone. The synthesis features an intramolecular aldol cyclization to construct the desired cis-fused decalin skeleton and an acid-catalyzed dehydration and olefin isomerization to install the γ-butenolide ring.
Co-reporter:Huilin Li, Yuanyuan Zhang, Xingang Xie, Haichen Ma, Changgui Zhao, Gaoyuan Zhao, and Xuegong She
Organic Letters 2014 Volume 16(Issue 17) pp:4440-4443
Publication Date(Web):August 8, 2014
DOI:10.1021/ol501960j
Bioinspired total synthesis of gymnothelignan N was accomplished in 13 steps and 6.7% overall yield. The synthesis features a syn Evans aldol reaction, an intramolecular hydrogenative dehydration reaction, and a phenol oxidative dearomatization/Friedel–Crafts reaction, which provides a new plausible biosynthetic pathway for the gymnothelignans and other symbiotic members. Meanwhile, another tetrahydrofuran-type lignan beilschmin A was also synthesized.
Co-reporter:Shiyan Xu, Jixiang Gu, Huilin Li, Donghui Ma, Xingang Xie, and Xuegong She
Organic Letters 2014 Volume 16(Issue 7) pp:1996-1999
Publication Date(Web):March 26, 2014
DOI:10.1021/ol500553x
The first enantioselective total synthesis of the structurally unique nortriterpenoid (−)-walsucochin B has been accomplished through the cationic polyolefin cyclization initiated by chiral epoxide. The core framework and the stereocenters in the natural product were all constructed in this step. A site-selective, late-stage free-radical halogenation and Seyferth–Gilbert homologation was adopted to install the acetylene moiety to synthesize the phenylacetylene. The absolute configuration of walsucochin B was confirmed through enantioselective total synthesis.
Co-reporter:Huilin Li;Yangcheng Qiu;Changgui Zhao;Ziyun Yuan;Dr. Xingang Xie;Dr. Xuegong She
Chemistry – An Asian Journal 2014 Volume 9( Issue 5) pp:1274-1277
Publication Date(Web):
DOI:10.1002/asia.201400002
Abstract
Daphenylline is a recently isolated Daphniphyllum alkaloid with an unprecedented novel hexacyclic scaffold. In this study, the synthesis of the fused all-carbon DEF tricyclic skeleton of daphenylline has been accomplished. Key steps of the reported sequence involve Evans asymmetric allylation, aldol condensation, Diels–Alder reaction, and oxidative aromatization reactions. The developed strategy might lead to the total synthesis of daphenylline.
Co-reporter:Changgui Zhao;Dr. Xingang Xie;Shuangshuang Duan;Huilin Li;Dr. Ran Fang;Dr. Xuegong She
Angewandte Chemie International Edition 2014 Volume 53( Issue 40) pp:10789-10793
Publication Date(Web):
DOI:10.1002/anie.201406486
Abstract
A highly efficient strategy for the formation of medium-sized-ring ethers and amines based on a gold-catalyzed cascade reaction, involving enynyl ester isomerization and intramolecular [3+2] cyclization, has been developed. Various multisubstituted medium-sized-ring unsaturated ethers and amines were obtained through this transformation. This method represents one of the relatively few transition metal catalyzed intramolecular cycloaddition reactions for medium-sized ring synthesis.
Co-reporter:Changgui Zhao;Dr. Xingang Xie;Shuangshuang Duan;Huilin Li;Dr. Ran Fang;Dr. Xuegong She
Angewandte Chemie 2014 Volume 126( Issue 40) pp:10965-10969
Publication Date(Web):
DOI:10.1002/ange.201406486
Abstract
A highly efficient strategy for the formation of medium-sized-ring ethers and amines based on a gold-catalyzed cascade reaction, involving enynyl ester isomerization and intramolecular [3+2] cyclization, has been developed. Various multisubstituted medium-sized-ring unsaturated ethers and amines were obtained through this transformation. This method represents one of the relatively few transition metal catalyzed intramolecular cycloaddition reactions for medium-sized ring synthesis.
Co-reporter:Runfeng Han, Jing Qi, Jixiang Gu, Donghui Ma, Xingang Xie, and Xuegong She
ACS Catalysis 2013 Volume 3(Issue 12) pp:2705
Publication Date(Web):October 23, 2013
DOI:10.1021/cs400602v
N-Heterocyclic carbene-catalyzed formal [3+2] annulation of alkynyl aldehydes and nitrosobenzenes has been reported. This transformation provided the novel C–X bond formation under mild conditions in moderate to satisfactory yields. The catalytic protocol allows for a rapid construction of 2,5-disubstituted isoxazol-3(2H)-ones and 2,3-disubstituted isoxazol-5(2H)-ones from the same materials via a highly regioselectively umpolung stratgy.Keywords: alkynyl aldehydes; N-heterocyclic carbene; nitrosobenzenes; regioselective; umpolung; [3+2] annulation
Co-reporter:Bowen Fang, Xingang Xie, Huilin Li, Peng Jing, Jixiang Gu, Xuegong She
Tetrahedron Letters 2013 Volume 54(Issue 47) pp:6349-6351
Publication Date(Web):20 November 2013
DOI:10.1016/j.tetlet.2013.09.055
A concise asymmetric total synthesis of (+)-monocerin has been accomplished. The cis-fused furobenzopyranone of monocerin was efficiently constructed via a Lewis acid-mediated stereoselective cyclization of 1,2,4-triols intermediate.
Co-reporter:Bowen Fang, Xingang Xie, Peng Jing, Changgui Zhao, Huilin Li, Haichen Ma, Xuegong She
Tetrahedron 2013 69(51) pp: 11025-11030
Publication Date(Web):
DOI:10.1016/j.tet.2013.09.075
Co-reporter:Yongping He, Bin Ma, Juan Yang, Xingang Xie, Xuegong She
Tetrahedron 2013 69(26) pp: 5545-5549
Publication Date(Web):
DOI:10.1016/j.tet.2013.04.065
Co-reporter:Yongping He, Haitao Hu, Xingang Xie, Xuegong She
Tetrahedron 2013 69(2) pp: 559-563
Publication Date(Web):
DOI:10.1016/j.tet.2012.11.024
Co-reporter:Jing Qi;Dr. Xingang Xie;Runfeng Han;Donghui Ma;Juan Yang;Dr. Xuegong She
Chemistry - A European Journal 2013 Volume 19( Issue 13) pp:4146-4150
Publication Date(Web):
DOI:10.1002/chem.201204386
Co-reporter:Juan Yang, Xingang Xie, Zhengshen Wang, Ruoming Mei, Huaiji Zheng, Xiaolei Wang, Ling Zhang, Jing Qi, and Xuegong She
The Journal of Organic Chemistry 2013 Volume 78(Issue 3) pp:1230-1235
Publication Date(Web):January 10, 2013
DOI:10.1021/jo302404v
A novel tandem Mannich/intramolecular aminal formation between tryptamines and salicylaldehydes was reported. This strategy provides a promising approach for the stereoselective synthesis of a range of complex fused spiroindolines, which bear a highly congested contiguous spiro quaternary center and two tertiary stereocenters, in a highly economical and effective fashion.
Co-reporter:Xing Huo;Changgui Zhao;Gaoyuan Zhao;Shouchu Tang;Huilin Li;Dr. Xingang Xie;Dr. Xuegong She
Chemistry – An Asian Journal 2013 Volume 8( Issue 5) pp:892-895
Publication Date(Web):
DOI:10.1002/asia.201300018
Co-reporter:Bowen Fang, Xingang Xie, Changgui Zhao, Peng Jing, Huilin Li, Zhengshen Wang, Jixiang Gu, and Xuegong She
The Journal of Organic Chemistry 2013 Volume 78(Issue 12) pp:6338-6343
Publication Date(Web):May 28, 2013
DOI:10.1021/jo400760q
A concise asymmetric total synthesis of a fusarentin ether (1) with sequential biomimetic transformation to its analogues fusarentin 6,7-dimethyl ether (2), 7-O-demethylmonocerin (3), and (+)-monocerin (4) has been accomplished. The cis-fused furobenzopyranones of 7-O-demethylmonocerin (3) and (+)-monocerin (4) were efficiently constructed via an intramolecular nucleophilic trapping of a quinonemethide intermediate, which was obtained by benzylic oxidation of fusarentin 6-methyl ether (1) using hypervalent iodine reagent.
Co-reporter:Changgui Zhao, Huaiji Zheng, Peng Jing, Bowen Fang, Xingang Xie, and Xuegong She
Organic Letters 2012 Volume 14(Issue 9) pp:2293-2295
Publication Date(Web):April 12, 2012
DOI:10.1021/ol3007138
A concise construction of the 6/6/5 tricyclic core of Lycopodium alkaloid palhinine A (1) has been accomplished. The developed synthetic strategy featured a tandem oxidative dearomatization/intramolecular Diels–Alder reaction to construct C/D rings and an intramolecular 5-exo-trig radical cyclization to install the B ring of palhinine A (1). The developed approach paves the way for the total synthesis of palhinine A (1).
Co-reporter:Bowen Fang, Huaiji Zheng, Changgui Zhao, Peng Jing, Huilin Li, Xingang Xie, and Xuegong She
The Journal of Organic Chemistry 2012 Volume 77(Issue 18) pp:8367-8373
Publication Date(Web):August 30, 2012
DOI:10.1021/jo301533f
A concise synthesis of the tetracyclic core (ABCE rings) of daphenylline has been accomplished involving a benzobicyclo[3.3.1] lactam as the key intermediate. This bridged bicyclic intermediate was efficiently constructed via a Brønsted acid promoted intramolecular Friedel–Crafts type Michael addition of a δ-benzyl α,β-unsaturated δ-lactam.
Co-reporter:Huaiji Zheng, Changgui Zhao, Bowen Fang, Peng Jing, Juan Yang, Xingang Xie, and Xuegong She
The Journal of Organic Chemistry 2012 Volume 77(Issue 13) pp:5656-5663
Publication Date(Web):June 4, 2012
DOI:10.1021/jo300805n
The first asymmetric total syntheses of cladosporin and isocladosporin were accomplished in 8 steps with 8% overall yield and 10 steps with 26% overall yield, respectively. The relative configuration of isocladosporin was determined via this total synthesis.
Co-reporter:Peng Jing;Zhen Yang;Changgui Zhao;Huaiji Zheng;Bowen Fang;Dr. Xingang Xie;Dr. Xuegong She
Chemistry - A European Journal 2012 Volume 18( Issue 22) pp:6729-6732
Publication Date(Web):
DOI:10.1002/chem.201200867
Co-reporter:Qiang Chen;Xing Huo;Zhen Yang;Dr. Xuegong She
Chemistry – An Asian Journal 2012 Volume 7( Issue 11) pp:2543-2546
Publication Date(Web):
DOI:10.1002/asia.201200505
Co-reporter:Ling Zhang, Xingang Xie, Jian Liu, Jing Qi, Donghui Ma, and Xuegong She
Organic Letters 2011 Volume 13(Issue 11) pp:2956-2958
Publication Date(Web):May 11, 2011
DOI:10.1021/ol201047m
The first and efficient total synthesis of (±)-dasyscyphin D was achieved in 9 steps with 22.6% overall yield. The key steps involved a PtCl2-catalyzed pentannulation reaction and acid-catalyzed double Robinson annulations.
Co-reporter:Qipu Dai, Xingang Xie, Shiyan Xu, Donghui Ma, Shibing Tang, and Xuegong She
Organic Letters 2011 Volume 13(Issue 9) pp:2302-2305
Publication Date(Web):April 1, 2011
DOI:10.1021/ol2005616
First total syntheses of the isoechinulin-type alkaloids: Tardioxopiperazine A, Isoechinulin A, and Variecolorin C have been achieved from a common key intermediate 5, which was derived from a regiocontrolled Stille cross-coupling reaction of an allylindium reagent.
Co-reporter:Jiyue Zheng, Xingang Xie, Changgui Zhao, Yongping He, Huaiji Zheng, Zhen Yang, and Xuegong She
Organic Letters 2011 Volume 13(Issue 2) pp:173-175
Publication Date(Web):December 9, 2010
DOI:10.1021/ol102593r
The first total synthesis of (−)-Przewalskin B has been accomplished with an intramolecular nucleophilic acyl substitution (INAS) reaction and an intramolecular aldol condensation as key steps.
Co-reporter:Zhen Yang, Xingang Xie, Peng Jing, Gaoyuan Zhao, Jiyue Zheng, Changgui Zhao and Xuegong She
Organic & Biomolecular Chemistry 2011 vol. 9(Issue 4) pp:984-986
Publication Date(Web):13 Dec 2010
DOI:10.1039/C0OB00971G
The total synthesis of cyanolide A has been achieved in 14 steps from commercially available (S)-2-ethyloxirane, exploiting the palladium-catalyzed intramolecular alkoxycarbonylation as the key step to construct the tetrasubstituted cis-tetrahydropyran ring with high stereoselectivity.
Co-reporter:Jing Qi, Xingang Xie, Jinmei He, Ling Zhang, Donghui Ma and Xuegong She
Organic & Biomolecular Chemistry 2011 vol. 9(Issue 17) pp:5948-5950
Publication Date(Web):24 Jun 2011
DOI:10.1039/C1OB05854A
N-Heterocyclic carbene was employed as an efficient organic catalyst to catalyze a cascade epoxide-opening and lactonization reaction. This organocatalytic process could transform various readily accessible γ-epoxy-α,β-enals into dihydropyrone derivatives in good to excellent yields.
Co-reporter:Huaiji Zheng, Xingang Xie, Juan Yang, Changgui Zhao, Peng Jing, Bowen Fang and Xuegong She
Organic & Biomolecular Chemistry 2011 vol. 9(Issue 22) pp:7755-7762
Publication Date(Web):18 Aug 2011
DOI:10.1039/C1OB06138K
An efficient PtI2-catalyzed tandem reaction of arylpropargylic esters, involving 3,3-rearrangement and Nazarov reaction, has been developed to produce 3-substituted and 3,3-disubstituted indanone derivatives. This approach provided a pathway to the synthesis of indanone skeletons in natural products.
Co-reporter:Huaiji Zheng ; Jiyue Zheng ; Binxun Yu ; Qiang Chen ; Xiaolei Wang ; Yongping He ; Zhen Yang
Journal of the American Chemical Society 2010 Volume 132(Issue 6) pp:1788-1789
Publication Date(Web):January 25, 2010
DOI:10.1021/ja910346m
A platinum-catalyzed tandem reaction involving enynyl ester isomerization and subsequent intramolecular [3 + 2] cyclization has been developed. This strategy provides an efficient approach to five-, six-, or seven-membered cyclic polyfunctional compounds.
Co-reporter:Shibing Tang, Jinmei He, Yongquan Sun, Liuer He and Xuegong She
Organic Letters 2009 Volume 11(Issue 17) pp:3982-3985
Publication Date(Web):August 6, 2009
DOI:10.1021/ol901626n
A series of 3-substituted and 3,5-disubstituted isoxazoles have been efficiently synthesized in moderate to excellent yields by the reaction of N-hydroxyl-4-toluenesulfonamide with α,β-unsaturated aldehydes/ketones. This novel strategy is associated with readily available starting materials, mild conditions, high regioselectivity, and wide scope.
Co-reporter:Binxun Yu, Tuo Jiang, Junpeng Li, Yingpeng Su, Xinfu Pan and Xuegong She
Organic Letters 2009 Volume 11(Issue 15) pp:3442-3445
Publication Date(Web):July 15, 2009
DOI:10.1021/ol901291w
A step-economic method to construct the tetrahydropyran ring, involving sequential benzylic/allylic C−H bond activation via DDQ oxidation and nucleophilic attack of an unactivated olefin, is described. The equatorial-trisubstituted Prins products are obtained from benzyl and allyl homoallylic ethers with high yield and stereochemical fidelity.
Co-reporter:Xiaolei Wang, Wenkuan Wang, Huaiji Zheng, Yingpeng Su, Tuo Jiang, Yongping He and Xuegong She
Organic Letters 2009 Volume 11(Issue 14) pp:3136-3138
Publication Date(Web):June 19, 2009
DOI:10.1021/ol901024t
Concise and efficient asymmetric total syntheses of three substituted α-pyrone-type natural products have been accomplished via 7−9 steps from 5b in high overall yields, which involve linchpin coupling, ring-closing metathesis, and a tandem sequence of deacetylation and intramolecular oxa-Michael addition as the key steps.
Co-reporter:Xinyun LI;Xing HUO;Junpeng LI, ;Xinfu PAN
Chinese Journal of Chemistry 2009 Volume 27( Issue 7) pp:1379-1381
Publication Date(Web):
DOI:10.1002/cjoc.200990230
Abstract
A concise total synthesis of (±)-yaequinolone A2 (2), a 2-quinolone alkaloid, has been accomplished through 6 steps from anthranilic acid with an overall yield of 27.8%. The synthetic strategy exploits highly diastereoselective intramolecular aldol addition of the MOM protected α-hydroxyanilide 7 as the key step.
Co-reporter:Jinmei He, Shibing Tang, Shouchu Tang, Jian Liu, Yongquan Sun, Xinfu Pan, Xuegong She
Tetrahedron Letters 2009 50(4) pp: 430-433
Publication Date(Web):
DOI:10.1016/j.tetlet.2008.11.032
Co-reporter:Jian Liu, Ke Xu, Jinmei He, Ling Zhang, Xinfu Pan and Xuegong She
The Journal of Organic Chemistry 2009 Volume 74(Issue 14) pp:5063-5066
Publication Date(Web):June 1, 2009
DOI:10.1021/jo900820f
An efficient total synthesis of (+)-aspergillide B has been achieved, which features the C-glycosylation reaction for constructing the 2,6-trans-substituted pyran core, a highly effective four-step sequence without purification to produce the key intermediate 13 and an advantegous E-selective Julia−Kocienski olefination on a highly elaborate substrate. The synthesis confirmed the revised structure of aspergillide B by Uenishi.
Co-reporter:Yingpeng Su, Yanfen Xu, Junjie Han, Jiyue Zheng, Jing Qi, Tuo Jiang, Xinfu Pan and Xuegong She
The Journal of Organic Chemistry 2009 Volume 74(Issue 7) pp:2743-2749
Publication Date(Web):March 9, 2009
DOI:10.1021/jo9000146
An efficient total synthesis of (−)-bitungolide F (6) in 17 steps and 20.1% yield is described herein. Key steps involve a Myers asymmetric alkylation to introduce the C6 methyl with proper stereochemistry, a Claisen-like cyclization to construct the α,β-unsaturated δ-lactone and a Julia−Kocienski olefination to assemble the conjugated diene moiety.
Co-reporter:Junjie Han, Yingpeng Su, Tuo Jiang, Yanfen Xu, Xing Huo, Xuegong She and Xinfu Pan
The Journal of Organic Chemistry 2009 Volume 74(Issue 10) pp:3930-3932
Publication Date(Web):April 21, 2009
DOI:10.1021/jo900370a
The first total synthesis of the 14-membered natural macrocyclic bislactone 4-keto-clonostachydiol, along with its enantiomer, has been accomplished in 13 steps with overall yields of 8.4% and 8.0%, respectively. The absolute configuration of 4-keto-clonostachydiol 1 has been revised as (5S,10S,13S).
Co-reporter:Wen-Kuan WANG;Ji-Yong ZHANG;Jin-Mei HE;Shi-Bing TANG;Xiao-Lei WANG;Xue-Gong SHE;Xin-Fu PAN
Chinese Journal of Chemistry 2008 Volume 26( Issue 6) pp:1109-1113
Publication Date(Web):
DOI:10.1002/cjoc.200890197
Abstract
An enantioselective total synthesis of (−)-cladospolide B was described. The key steps in this synthesis include(a) a Sharpless asymmetric dihydroxylation to elaborate syn diol at C-4 and C-5 positions; (b) a Mitsunobu esterification to reverse the configuration at C-11 from (S) to (R); and (c) a ring-closing metathesis to access the 12-membered macrocyclic ring.
Co-reporter:Jian Liu, Ling Zhang, Jinmei He, Liuer He, Bowen Ma, Xinfu Pan, Xuegong She
Tetrahedron: Asymmetry 2008 Volume 19(Issue 8) pp:906-911
Publication Date(Web):1 May 2008
DOI:10.1016/j.tetasy.2008.03.024
The facile total synthesis of the antimalarial nonenolide 1 is reported. The convergent strategy features the use of reactions such as Sharpless asymmetric dihydroxylation, aldol addition, Mitsunobu reaction, and ring-closing metathesis (RCM).(S)-1-((Hex-5-en-2-yloxy)methyl)-4-methoxybenzeneC14H20O2[α]D25=+22 (c 2.0, CHCl3)Source of chirality: (S)-propylene oxideAbsolute configuration: (S)(2S,5R)-5-(Methoxymethoxy)hept-6-en-2-olC9H18O3[α]D25=+13 (c 0.3, CHCl3)Absolute configuration: (2S,5R)(S)-4-Benzyl-3-((2S,3R)-3-(tert-butyldimethylsilyloxy)-2-(methylthio)pent-4-enoyl)oxazolidin-2-oneC22H33NO4SSiEe >98% [by chiral HPLC][α]D25=+28.6 (c 3.45, CHCl3)Source of chirality: Evans Aldol reactionAbsolute configuration: (S,2S,3R)(S)-((2R,5R)-5-(Methoxymethoxy)hept-6-en-2-yl) 3-(tert-butyldimethylsilyloxy)pent-4-enoateC20H38O5Si[α]D25=+39.6 (c 4.0, CHCl3)Source of chirality: Mitsunobu reactionAbsolute configuration: (S,2S,5R)
Co-reporter:Wei-Guo Quan;Bin-Xun Yu;Ji-Yong Zhang;Qi-Ren Liang;Yong-Quan Sun;Xue-Gong She;Xin-Fu Pan
Chinese Journal of Chemistry 2007 Volume 25(Issue 5) pp:
Publication Date(Web):11 MAY 2007
DOI:10.1002/cjoc.200790129
The facile enantioselective synthesis of the di-O-methyl ethers of (−)-agatharesinol (1b), (−)-sugiresionl (2b), (+)-nyasol (3b) and (+)-tetrahydronyasol (4) were achieved in high yield. The absolute configuration of (+)-3a was confirmed via first total synthesis of (+)-3b and (+)-4.
Co-reporter:Qiaoling Wang;Qinggang Huang;Bo Chen;Jiangping Lu;Hui Wang ;Xinfu Pan
Angewandte Chemie 2006 Volume 118(Issue 22) pp:
Publication Date(Web):28 APR 2006
DOI:10.1002/ange.200600006
Ein allgemeiner Ansatz zur Synthese von Hexahydrodibenzopyranen (HHDBPs) wird mit der enantioselektiven Totalsynthese von (+)-Machaeriol D illustriert. Schlüsselschritt ist der hoch regio- und stereoselektive Aufbau der vier Stereozentren des Naturstoffs in der SN2′-Reaktion eines Arylcyanocuprats mit dem Silylenolether eines optisch aktiven α,β-Epoxycyclohexanons (siehe Schema; R=Methoxymethyl; TMS=Trimethylsilyl, TBS=tert-Butyldimethylsilyl).
Co-reporter:Qiaoling Wang;Qinggang Huang;Bo Chen;Jiangping Lu;Hui Wang ;Xinfu Pan
Angewandte Chemie International Edition 2006 Volume 45(Issue 22) pp:
Publication Date(Web):28 APR 2006
DOI:10.1002/anie.200600006
A general strategy for the synthesis of hexahydrodibenzopyrans (HHDBPs) is illustrated in the enantioselective total synthesis of (+)-machaeriol D. In the key step, an SN2′ reaction of an aryl cyanocuprate with a silyl enol ether of an optically active α,β-epoxycyclohexanone enabled the construction of the four stereocenters of the natural product with high regio- and stereoselectivity (see scheme; R=methoxymethyl). TMS=trimethylsilyl, TBS=tert-butyldimethylsilyl.
Co-reporter:Jiangping Lu, Xingang Xie, Bo Chen, Xuegong She, Xinfu Pan
Tetrahedron: Asymmetry 2005 Volume 16(Issue 8) pp:1435-1438
Publication Date(Web):18 April 2005
DOI:10.1016/j.tetasy.2005.03.005
The enantioselective synthesis of the phenolic sesquiterenses (S)- and (R)-curcuphenol is reported. The key step in this synthesis is the asymmetric conjugate addition using a readily available enantiomerically pure sulfoxide as the chiral auxiliary.1-((R)-(E)-2-(p-Tolylsulfinyl)vinyl)-2-(methoxymethoxy)-4-methylbenzeneC18H20O3SEe 99%[α]D25=+59 (c 2.56, CHCl3)Source of chirality: enantiopure starting materialAbsolute configuration: R2-((R)-(E)-2-(p-Tolylsulfinyl)vinyl)-5-methylphenolC16H16O2SEe 99%[α]D25=+187 (c 0.40, CHCl3)Source of chirality: enantiopure starting materialAbsolute configuration: R(S)-3-(p-Tolylsulfinyl)-7-methyl-2H-chromen-2-oneC17H14O3SEe 99%[α]D22=+18 (c 2.00, CHCl3)Source of chirality: enantiopure starting materialAbsolute configuration: S2-((S)-4-Hydroxybutan-2-yl)-5-methylphenolC11H16O2Ee 88%[α]D15=+23 (c 1.30, CHCl3)Source of chirality: asymmetric synthesisAbsolute configuration: S2-((S)-4-Iodobutan-2-yl)-5-methylphenolC11H15OIEe 88%[α]D15=+36 (c 1.25, CHCl3)Source of chirality: asymmetric synthesisAbsolute configuration: S(S)-(+)-CurcuphenolC15H22OEe 88%[α]D15=+21 (c 1.50, CHCl3)Source of chirality: asymmetric synthesisAbsolute configuration: S
Co-reporter:Shangbiao Feng, Tao Li, Chenglong Du, Peng Chen, Dengpeng Song, Jinlai Li, Xingang Xie and Xuegong She
Chemical Communications 2017 - vol. 53(Issue 33) pp:NaN4588-4588
Publication Date(Web):2017/03/31
DOI:10.1039/C7CC01813D
A visible-light promoted single electron oxidation of ether enabled by photoredox catalysis has been accomplished. This procedure initiates a novel radical insertion/cyclization cascade reaction to generate phenanthridines and isoquinolines from easily available isocyanides under mild reaction conditions.
Co-reporter:Shuangshuang Duan, Dan Long, Changgui Zhao, Gaoyuan Zhao, Ziyun Yuan, Xingang Xie, Jianguo Fang and Xuegong She
Inorganic Chemistry Frontiers 2016 - vol. 3(Issue 9) pp:NaN1143-1143
Publication Date(Web):2016/07/18
DOI:10.1039/C6QO00222F
An efficient approach for the synthesis of the 9/6/6 tricyclic structure of Lycopodium alkaloid palhinine A has been accomplished. The developed synthetic route features oxidative dearomatization and tandem hydroxyl oxidation/intramolecular Diels–Alder (IMDA) reactions to assemble the A/C/D tricyclic ring system. Most importantly, the protocol can undergo ring constriction to rapidly construct the highly strained nine-membered azonane ring of palhinine A.
Co-reporter:Haichen Ma, Xingang Xie, Peng Jing, Weiwei Zhang and Xuegong She
Organic & Biomolecular Chemistry 2015 - vol. 13(Issue 18) pp:NaN5259-5259
Publication Date(Web):2015/03/24
DOI:10.1039/C5OB00228A
(±)-Aspidospermidine (1) has been synthesized from the commercially available 2,3-dihydro-1H-carbazol-4(9H)-one 6 in 10 steps with 20% overall yield. The key step of the strategy is a one-pot carbonyl reduction/iminium formation/intramolecular conjugate addition reaction that may be applied for the synthesis of other Aspidosperma alkaloids.
Co-reporter:Huaiji Zheng, Xingang Xie, Juan Yang, Changgui Zhao, Peng Jing, Bowen Fang and Xuegong She
Organic & Biomolecular Chemistry 2011 - vol. 9(Issue 22) pp:NaN7762-7762
Publication Date(Web):2011/08/18
DOI:10.1039/C1OB06138K
An efficient PtI2-catalyzed tandem reaction of arylpropargylic esters, involving 3,3-rearrangement and Nazarov reaction, has been developed to produce 3-substituted and 3,3-disubstituted indanone derivatives. This approach provided a pathway to the synthesis of indanone skeletons in natural products.
Co-reporter:Jing Qi, Xingang Xie, Jinmei He, Ling Zhang, Donghui Ma and Xuegong She
Organic & Biomolecular Chemistry 2011 - vol. 9(Issue 17) pp:NaN5950-5950
Publication Date(Web):2011/06/24
DOI:10.1039/C1OB05854A
N-Heterocyclic carbene was employed as an efficient organic catalyst to catalyze a cascade epoxide-opening and lactonization reaction. This organocatalytic process could transform various readily accessible γ-epoxy-α,β-enals into dihydropyrone derivatives in good to excellent yields.
Co-reporter:Zhen Yang, Xingang Xie, Peng Jing, Gaoyuan Zhao, Jiyue Zheng, Changgui Zhao and Xuegong She
Organic & Biomolecular Chemistry 2011 - vol. 9(Issue 4) pp:NaN986-986
Publication Date(Web):2010/12/13
DOI:10.1039/C0OB00971G
The total synthesis of cyanolide A has been achieved in 14 steps from commercially available (S)-2-ethyloxirane, exploiting the palladium-catalyzed intramolecular alkoxycarbonylation as the key step to construct the tetrasubstituted cis-tetrahydropyran ring with high stereoselectivity.
Co-reporter:Gaoyuan Zhao, Min He, Huilin Li, Shuangshuang Duan, Ziyun Yuan, Xingang Xie and Xuegong She
Chemical Communications 2015 - vol. 51(Issue 97) pp:NaN17323-17323
Publication Date(Web):2015/10/06
DOI:10.1039/C5CC06923H
Domino intramolecular Diels–Alder (IMDA) reactions towards the 6/6/5/5 fused tetracyclic natural products were developed in satisfactory yield and high stereoselectivity. Four rings, six contiguous stereocenters and four C–C bonds were formed in a single operation. 4-epi-Hydromitchellene B was also synthesised efficiently via this strategy.