摘要:
The example of enzyme-catalyzed asymmetric C-C Michael addition was observed using Lipozyme TLIM (immobilized lipase from Thermomyces lanuginosus) in organic medium in the presence of water. This biocatalysis is applicable to the Michael additions of a wide range of 1,3-dicarbonyl compounds and cyclohexanone to aromatic and heteroaromatic nitroolefins and cyclohexenone. The enantioselectivities up to 83% ee and yields up to 90% were achieved. The enzyme can be reused for three cycles. (C) 2010 Elsevier B.V. All rights reserved.