NHC Organocatalytic Formal LUMO Activation of α,β-Unsaturated Esters for Reaction with Enamides
作者:Jiajia Cheng、Zhijian Huang、Yonggui Robin Chi
DOI:10.1002/anie.201303247
日期:2013.8.12
An effective wake‐up call: Stable α,β‐unsaturated esters were activated by the addition of a chiral N‐heterocyclic carbene (NHC) organocatalyst, and the resulting reactive Michael acceptor intermediates reacted with enamide nucleophiles to furnish optically pure products (see scheme; Ts=p‐toluenesulfonyl). These products can be converted readily into bioactive δ‐lactams, piperidines, and their derivatives