描述了作为供体的 α,β-不饱和 γ-丁内酰胺的直接催化不对称乙烯基反应。在简单的质子转移条件下,同双核 Ni(2)-Schiff 碱配合物促进了 N-Boc 亚胺的乙烯基曼尼希型反应,以及选择性地在 γ 位与硝基烯烃的乙烯基迈克尔反应。Vinylogous Mannich 加合物在 5:1-->30:1 dr 和 99% ee 中获得,而vinylogous Michael 加合物在 16:1-->30:1 dr 和 93-99% ee 中获得。
Direct Catalytic Asymmetric Vinylogous Mannich-Type and Michael Reactions of an α,β-Unsaturated γ-Butyrolactam under Dinuclear Nickel Catalysis
作者:Nicholas E. Shepherd、Hirooki Tanabe、Yingjie Xu、Shigeki Matsunaga、Masakatsu Shibasaki
DOI:10.1021/ja1002636
日期:2010.3.24
Directcatalyticasymmetricvinylogous reactions of an alpha,beta-unsaturated gamma-butyrolactam as a donor are described. A homodinuclear Ni(2)-Schiff base complex promoted a vinylogous Mannich-type reaction of N-Boc imines as well as a vinylogousMichael reaction to nitroalkenes selectively at the gamma-position under simple proton-transfer conditions. Vinylogous Mannich adducts were obtained in
描述了作为供体的 α,β-不饱和 γ-丁内酰胺的直接催化不对称乙烯基反应。在简单的质子转移条件下,同双核 Ni(2)-Schiff 碱配合物促进了 N-Boc 亚胺的乙烯基曼尼希型反应,以及选择性地在 γ 位与硝基烯烃的乙烯基迈克尔反应。Vinylogous Mannich 加合物在 5:1-->30:1 dr 和 99% ee 中获得,而vinylogous Michael 加合物在 16:1-->30:1 dr 和 93-99% ee 中获得。
Organocatalytic asymmetric direct vinylogous Michael addition of α,β-unsaturated γ-butyrolactam to nitroolefins
作者:Abhijnan Ray Choudhury、Santanu Mukherjee
DOI:10.1039/c2ob25832c
日期:——
The first organocatalytic enantioselective directvinylogousMichael reaction of α,β-unsaturatedγ-butyrolactam to nitroolefins is developed using cinchona alkaloids as the catalysts. Both product enantiomers are accessible with moderate to good enantioselectivity.
Direct Catalytic Asymmetric Vinylogous Michael Reaction of α,β-Unsaturated γ-Butyrolactam under Dinuclear Nickel Schiff Base Catalysis
作者:Shigeki Matsunaga、Masakatsu Shibasaki、Hirooki Tanabe、Yingjie Xu、Bo Sun
DOI:10.3987/com-12-s(n)58
日期:——
Direct catalytic asymmetric vinylogous Michael reaction is described. 2.5 mol % of homobimetallic (S)-Ni-2-Schiff base complex efficiently catalyzed the addition of alpha,beta-unsaturated gamma-butyrolactam to nitroalkenes under simple proton transfer conditions, giving vinylogous Michael products in 83-99% yield, 16:1-> 30:1 dr, and 96-99% ee.