Base promoted synthesis of activated cyclopropanes bearing homologated carbonyl groups via tandem Michael addition–intramolecular enolate trapping
作者:Alessio Russo、Alessandra Lattanzi
DOI:10.1039/c1ob06487h
日期:——
A simple base promoted intramolecular Michael initiated ring closure reaction of γ-hydroxyenone derived diphenyl phosphinates with 1,3-indandione, enabled the synthesis of novel activated cyclopropanes with homologated carbonyl moiety in good yield. Promising levels of enantioselectivity are achieved when using cinchona derivatives as promoters.
δ-羟基烯酮衍生的二苯基膦酸盐与 1,3-茚二酮进行了简单的碱促进分子内迈克尔引发的闭环反应,从而以良好的收率合成了具有同源羰基的新型活化环丙烷。使用金鸡纳树衍生物作为促进剂,可实现良好的对映选择性。