Asymmetric Michael Addition of Malonates to Enones Catalyzed by a Primary β-Amino Acid and Its Lithium Salt
作者:Masanori Yoshida、Mao Narita、Shoji Hara
DOI:10.1021/jo201429w
日期:2011.10.21
Highly enantioselective Michaeladdition of malonates to enones was achieved using a mixed catalyst consisting of a primary β-amino acid, O-TBDPS (S)-β-homoserine, and its lithium salt. Various cyclic and acyclic enones were converted into 1,5-ketoesters in high yields (up to 92%) with high enantioselectivity (up to 97% ee) under mild reaction conditions. Details of synthesis of the catalyst, optimization
Enantioselective Organocatalytic Michael Addition of Malonates to α,β-Unsaturated Ketones
作者:Pengfei Li、Shigang Wen、Feng Yu、Qiaoxia Liu、Wenjun Li、Yongcan Wang、Xinmiao Liang、Jinxing Ye
DOI:10.1021/ol802892h
日期:2009.2.5
derived from 1,2-diaminocyclohexane and 9-amino (9-deoxy) cinchona alkaloid was developed into asymmetricMichaeladdition of malonates to enones. A series of cyclic and acyclic enones could react very well with different malonates in the presence of 4 with 0.5−10 mol % catalyst loading affording chiral Michael adducts with excellent yields and ee values.
Enzyme-Promoted Direct Asymmetric Michael Reaction by Using Protease from Streptomyces griseus
作者:Ling-Ling Wu、Ling-Po Li、Yang Xiang、Zhi Guan、Yan-Hong He
DOI:10.1007/s10562-017-2095-4
日期:2017.8
AbstractThe directasymmetric Michael addition of malonates and enones was promoted by protease from Streptomyces griseus for the first time. Yields of up to 84% with enantioselectivities of up to 98% enantiomeric excess (ee) were achieved under optimized conditions.Graphical AbstractProtease from Streptomyces griseus (SGP) was used for the first time as a biocatalyst in asymmetric Michael reaction of malonates
A General Organocatalytic Enantioselective Malonate Addition to α,β-Unsaturated Enones
作者:Veit Wascholowski、Kristian Rahbek Knudsen、Claire E. T. Mitchell、Steven V. Ley
DOI:10.1002/chem.200800673
日期:2008.7.7
A general enantioselective organocatalytic conjugate addition procedure of a variety of malonates to alpha,beta-unsaturated enone systems is presented. The reaction is efficiently catalysed by the pyrrolidinyl tetrazole catalyst 1. Cyclic, acyclic and aromatic enones can be used and the reaction with ethyl malonates 3 b provides the Michaeladdition products in high yields with good to excellent enantioselectivities