Asymmetric Diels−Alder Reactions of Chiral Cyclopropylidene Imide Dienophiles: Preparation of <i>gem</i>-Dimethyl- and Spirocyclopropane Norbornyl Carboxylic Acids
作者:Jeffrey T. Kuethe、Dalian Zhao、Guy R. Humphrey、Michel Journet、Arlene E. McKeown
DOI:10.1021/jo052516c
日期:2006.3.1
A highly efficient strategy has been developed for the rapid asymmetric synthesis of gem-dimethyl and spirocyclopropyl norbornyl carboxylic acids. The key transformation involved the unprecedented asymmetric Diels−Alder reaction of highly reactive β,β-cyclopropyl-α,β-unstaturated N-acyloxazolidinones with cyclopentadiene affording the adducts in high yield and de.
已经开发了用于宝石-二甲基和螺环丙基降冰片基羧酸的快速不对称合成的高效策略。关键的转变涉及高反应性的β,β-环丙基-α,β-不饱和N-酰基恶唑烷酮与环戊二烯的空前的不对称Diels-Alder反应,从而以高收率和高收率提供加合物。