Asymmetric Synthesis of γ-Nitroesters by an Organocatalytic One-Pot Strategy
作者:Kim L. Jensen、Pernille H. Poulsen、Bjarke S. Donslund、Fabio Morana、Karl Anker Jørgensen
DOI:10.1021/ol3002514
日期:2012.3.16
An enantioselective synthesis of γ-nitroesters by a one-pot asymmetric Michaeladdition/oxidative esterification of α,β-unsaturatedaldehydes is presented. The procedure is based on merging the enantioselective organocatalytic nitroalkane addition with an N-bromosuccinimide-based oxidation. The γ-nitroesters are obtained in good yields and enantioselectivities, and the method provides an attractive
An efficient enantioselective method for asymmetric Michael addition of nitroalkanes to α,β-unsaturated aldehydes
作者:Yongcan Wang、Pengfei Li、Xinmiao Liang、Tony Y. Zhang、Jinxing Ye
DOI:10.1039/b717000a
日期:——
The addition of nitroalkanes to alpha,beta-unsaturated aldehydes under the catalysis of (S)-2-(diphenyl(trimethylsilyloxy)methyl)pyrrolidine and lithium acetate as additive afforded gamma-nitroaldehydes in good yield and up to 97% ee.
Paraldehyde as an Acetaldehyde Precursor in Asymmetric Michael Reactions Promoted by Site-Isolated Incompatible Catalysts
作者:Xinyuan Fan、Carles Rodríguez-Escrich、Sonia Sayalero、Miquel A. Pericàs
DOI:10.1002/chem.201302087
日期:2013.8.12
song of ice and fire! The usually innocent paraldehyde can be used as an acetaldehydeprecursor in an organocatalytic asymmetricMichael addition (see scheme) thanks to the proper combination of two immobilized catalysts. The site isolation induced by the polymeric supports has proven crucial to preclude deactivation of the otherwise incompatiblecatalysts.