The Formal [3+2+1] Cyclisation of Cyclopropylamines with Carboxylic Anhydrides: A Quick Access to Polysubstituted 2,3,3a,4-Tetrahydro6(5H)-indolone Ring Systems
作者:Laurent Larquetoux、Justyna A. Kowalska、Yvan Six
DOI:10.1002/ejoc.200400291
日期:2004.8
Several 2-azabicyclo[3.1.0]hexanes were synthesised using the intramolecular version of the Kulinkovich−de Meijere cyclopropanation reaction. Upon heating in the presence of a carboxylic anhydride, the cyclopropane rings of these systems open up to afford vinylogous amides. Depending on the reaction conditions used, the monoacylated compounds may be the major products, or subsequent acylation may take
使用 Kulinkovich-de Meijere 环丙烷化反应的分子内版本合成了几种 2-氮杂双环 [3.1.0] 己烷。在羧酸酐存在下加热时,这些系统的环丙烷环打开以提供乙烯基酰胺。根据所用的反应条件,单酰化化合物可能是主要产物,或者可能发生随后的酰化反应以提供环状二酮。该方法是灵活的,可以在两步序列中加入不同的酰基。通过分子内醛醇化作用,二酮很容易转化为 2,3,3a,4-四氢-6(5H)-吲哚酮衍生物。产品是高度官能化的醇,以单一的非对映异构体形式获得。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)