Organocatalytic Enantioselective Cascade Michael−Michael−Wittig Reactions of Phosphorus Ylides: One-Pot Synthesis of the <i>all</i>-<i>cis</i> Trisubstituted Cyclohexenecarboxylates via the [1 + 2 + 3] Annulation
作者:Bor-Cherng Hong、Rei-Hau Jan、Chih-Wei Tsai、Roshan Y. Nimje、Ju-Hsiou Liao、Gene-Hsiang Lee
DOI:10.1021/ol9021832
日期:2009.11.19
The stereoselective synthesis of all-cis 5-nitro-4,6-diphenylcyclohex-1-enecarboxylic ester has been achieved by an organocatalytic asymmetric Michael−Michael−Wittig cascade reaction of phosphorus ylides, nitroolefins, and α,β-unsaturatedaldehydes with excellent enantioselectivities (up to >99% ee).