Ionic liquids accelerating cycloaddition between 1-aryl-2-halocyclopropenes and furan
作者:May-Fan Ding、Shaw-Tao Lin、Woan-Ju Chang
DOI:10.3998/ark.5550190.0011.219
日期:——
with furan in a RTIL to give a fair good yield of the [4+2]-cycloadducts with more than 90% of the exo-isomer. The imidazolium type ionicliquids are able to accelerate this cycloaddition process with high steric selectivity. Neither pyrrole nor thiophene undergoes the cycloaddition with cyclopropene to form the [4+2]-cycloadduct. 1-Aryl-3,3-difluoro-2-halocyclopropenes are inert towards furan even