Jun Qin

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Name: 秦俊; Jun Qin
Organization: Yunnan University
Department: School of Chemical Science and Technology
Title: Professor
Co-reporter:Quan Gou;Gang Liu;Lanxiu Zhou;Suiyun Chen
European Journal of Organic Chemistry 2017 Volume 2017(Issue 42) pp:6314-6318
Publication Date(Web):2017/11/16
DOI:10.1002/ejoc.201701215
A highly efficient protocol for the β-arylation of carboxylic amides by aryl iodides under PdCl2(CH3CN)2/CsOAc catalysis was developed. This method was found to tolerate a broad scope of substrates and was successfully employed in the preparation of a variety of β-aryl α-amino and γ-amino acid derivatives. The utility of this method was further illustrated in the synthesis of the psychotropic drug (±)-phenibut and β-aryl bile acid analogues.
Co-reporter:Quan Gou, Zhao-Fu Zhang, Zhi-Cheng Liu, and Jun Qin
The Journal of Organic Chemistry 2015 Volume 80(Issue 6) pp:3176-3186
Publication Date(Web):March 12, 2015
DOI:10.1021/acs.joc.5b00111
PdCl2(CH3CN)2-catalyzed arylation of unactivated C(sp3)–H bonds using (diacetoxyiodo)arenes as arylation reagents is reported. The reactivity of (diacetoxyiodo)arenes as arylation reagents is enabled in the presence of Cs2CO3 under the reaction conditions. This arylation method is highly efficient and occurs without the use of silver salt. The reaction tolerates a broad substrate scope that was not demonstrated by other silver salt-free C(sp3)–H bond arylation conditions. The synthetic utility of the method is further illustrated in the synthesis of the psychotropic drug phenibut. A detailed mechanism study has been conducted to understand the reaction pathway.
Co-reporter:Quan Gou;Gang Liu;Zi-Ning Liu ;Dr. Jun Qin
Chemistry - A European Journal 2015 Volume 21( Issue 44) pp:15491-15495
Publication Date(Web):
DOI:10.1002/chem.201502375

Abstract

PdII-catalyzed intermolecular amination of unactivated C(sp3)H bonds has been successfully developed for the first time. This method provides a new way to achieve the challenging intermolecular amination of unactivated C(sp3)H bonds, producing a variety of unnatural β2-amino carboxylic acid analogues. This C(sp3)H amination protocol is demonstrated with a broad substrate scope, good functional-group tolerance, and chemoselectivity. It is operated without use of phosphine ligand or external oxidant.

Co-reporter:Quan Gou;Bin Deng;Dr. Jun Qin
Chemistry - A European Journal 2015 Volume 21( Issue 36) pp:12586-12591
Publication Date(Web):
DOI:10.1002/chem.201501758

Abstract

The first example of direct arylation of (di)azinyl aldoxime ethers by aryl iodides is reported. The reaction produces, in a single step, a variety of geometrically pure unsymmetrical (E)-(di)azinylaryl ketoxime ethers, a class of nitrogenated motifs that have found wide applications in medicinal and organic chemistry but are difficult to access using conventional procedure. The utility of the method is further illustrated in a formal synthesis of the Merck melanin-concentrating hormone 1 receptor antagonist.

Co-reporter:Quan Gou, Bin Deng, Hongbin Zhang, and Jun Qin
Organic Letters 2013 Volume 15(Issue 17) pp:4604-4607
Publication Date(Web):August 15, 2013
DOI:10.1021/ol402215f
Arylations of substituted enamides by aryl iodides were achieved for the first time via an unusual PdCl2(COD)/Ag3PO4 catalytic system. A broad range of (Z)-β-amido-β-arylacrylates were prepared regio- and stereoselectively in a highly efficient manner.
5-(4-Fluorophenyl)picolinaldehyde
3-(4-fluorophenyl)-2-methylpropanoyl Chloride
5-PHENYLPYRIDINE-2-CARBALDEHYDE , 97%
1H-Isoindole-1,3(2H)-dione, 2-(cyclohexyloxy)-
(4-fluorophenyl)(pyridin-2-yl)methanone
Hexanoyl chloride, 6-(phenylmethoxy)-
Methanone, phenyl-2-pyridinyl-, O-methyloxime, (E)-
2-Pyridinecarboxaldehyde,O-methyloxime,(E)-(9CI)