C3-Symmetric Proline-Functionalized Organocatalysts: Enantioselective Michael Addition Reactions
作者:Jarugu Narasimha Moorthy、Satyajit Saha
DOI:10.1002/ejoc.201000569
日期:2010.11
C 3 -Symmetric, tripodal catalyst 4 based on 1,3,5-triethylbenzene, which incorporates the features of a molecular receptor, is shown to catalyze Michaeladditionreactions of carbonyl compounds to β-nitrostyrenes in a high stereoselectivity (up to 99:1 dr and up to 98 % ee).
基于 1,3,5-三乙苯的 C 3 -对称三足催化剂 4 结合了分子受体的特征,显示出以高立体选择性(高达 99: 1 dr 和高达 98 % ee)。
l-Proline derived triamine as a highly stereoselective organocatalyst for asymmetric Michael addition of cyclohexanone to nitroolefins
作者:Haibin Chen、Yu Wang、Siyu Wei、Jian Sun
DOI:10.1016/j.tetasy.2007.05.035
日期:2007.6
triamine 4 has been developed as a highly efficient and stereoselective organocatalyst for the asymmetric Michaeladdition of cyclohexanone to nitroolefins. In the presence of (CF3SO2)2NH, 4 catalyzed the reaction of cyclohexanone to a variety of nitroolefins with high yields (up to 99%) and excellent diastereoselectivities (up to 99:1 dr) and enantioselectivities (up to 98% ee).
脯氨酸衍生的三胺4已被开发为一种高效且立体选择性的有机催化剂,用于环己酮向硝基烯烃的不对称迈克尔加成反应。在(CF 3 SO 2)2 NH存在下,4催化环己酮与各种硝基烯烃的反应,产率高(高达99%),非对映选择性(高达99:1 dr)和对映选择性(高达98)。 %ee)。
A chiral thioureido acid as an effective additive for enantioselective organocatalytic Michael additions of nitroolefins
A novel and effective organocatalytic system consisting of pyrrolidinyl-thioimidazole and a chiral thioureido acid efficiently catalyzed the asymmetric Michaeladdition reactions of ketones to nitroolefins to afford the adducts with high diastereoselectivities (up to 99 : 1) and excellent enantioselectivities (up to 99% ee).
Highly efficient bifunctional organocatalysts for the asymmetric Michael addition of ketones to nitroolefins
作者:Chuanming Yu、Jun Qiu、Fei Zheng、Weihui Zhong
DOI:10.1016/j.tetlet.2011.04.067
日期:2011.6
A type of secondary–secondary–tertiary triamine bifunctionalorganocatalysts have been properly designed and synthesized. In our study, the designed catalyst (S)-N-(pyrrolidin-2-ylmethyl)pyridin-2-amine 5 has been shown to be highly efficient to promote the asymmetric Michaeladdition of ketones to nitroolefins at room temperature, which afforded the corresponding adducts in excellent diastereoselectivities
An efficient asymmetricMichaeladdition of cyclic ketones to β-nitrostyrenes using secondary diamine as an organocatalyst derived from l-proline and (R)-α-methylbenzyl amine has been described. This pyrrolidine based catalyst 1 was found to be very effective to synthesize various γ-nitrocarbonyl compounds in good yield (up to 81%) with excellent stereoselectivity (up to >99:1 dr and >99% ee).