Stereoselective synthesis of 4-substituted-cyclic sulfamidate-5-carboxylates by asymmetric transfer hydrogenation accompanied by dynamic kinetic resolution and applications to concise stereoselective syntheses of (−)-epi-cytoxazone and the taxotere side-chain
DDQ-mediated oxidation of sp3 C–H bond for the direct synthesis of vicinal tricarbonyl compounds
作者:Zheng-Lin Wang、Xing-Lan An、Li-Shi Ge、Jing-Hai Jin、Xiaoyan Luo、Wei-Ping Deng
DOI:10.1016/j.tet.2014.04.021
日期:2014.6
A facile and direct synthetic method was developed for the construction of vicinal tricarbonyl compounds (VTCs) in moderate to excellent yields (46-92%), by treating the readily available 1,3-dicarbonyl compounds with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) in the presence of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ). The reaction pathway involves the DDQ-mediated oxidative activation of sp(3) C-H bond and subsequent coupling to TEMPO to form the key intermediate TEMPO-substrate adduct, which can be further converted to VTC products promoted by DDQ (C) 2014 Elsevier Ltd. All rights reserved.
Stereoselective synthesis of 4-substituted-cyclic sulfamidate-5-carboxylates by asymmetric transfer hydrogenation accompanied by dynamic kinetic resolution and applications to concise stereoselective syntheses of (−)-epi-cytoxazone and the taxotere side-chain
作者:Jin-ah Kim、Yeon Ji Seo、Soyeong Kang、Juae Han、Hyeon-Kyu Lee
DOI:10.1039/c4cc06395c
日期:——
DKR driven, asymmetric transfer hydrogenations of cyclic sulfamidate imine-5-carboxylates were developed.
DKR驱动的不对称转移氢化反应已经成功开发,用于环状磺胺酸酯亚胺-5-羧酸酯。
Stereoselective Synthesis of Functionalized 1,3-Disubstituted Isoindolines via Rh(III)-Catalyzed Tandem Oxidative Olefination-Cyclization of 4-Aryl-cyclic Sulfamidate-5-Carboxylates
作者:Raghavendra Achary、In-A Jung、Se-Mi Son、Hyeon-Kyu Lee
DOI:10.1021/acs.joc.7b00799
日期:2017.7.21
direct, stereoselective synthesis of highly functionalized 1,3-disubstituted isoindolines 6 from enantiomerically enriched cyclic 4-aryl-sulfamidate-5-carboxylates (5) is described. The process involves sulfamidate directed, Rh(III)-catalyzed tandem ortho C–H olefination of the 4-aryl-sulfamidate-5-carboxylates and subsequent cyclization by aza-Michael addition. In the reaction, which generates trans-1