Intermolecular [3+2] MIRC reactions with alkynoates. Asymmetric Michael addition leading to a nonracemic cyclopentene-annulated α,β-butenolide
作者:Philippe Nakache、Eugene Ghera、Alfred Hassner
DOI:10.1016/s0040-4039(00)00867-4
日期:2000.7
A novel Michael-initiated ring closure reaction involving allylic chlorosulfone (2) and gamma-alkoxy-alpha,beta-ynoates to afford 4-methylenecyclopentenecarboxylates is reported, while with gamma-alkylynoates no reaction occurred. With chiral phenyl ynoates 4, the reaction proceeds by 1,3-asymmetric induction and leads further to a nonracemic annulated alpha,beta-butenolide (7). (C) 2000 Elsevier Science Ltd. All rights reserved.