Stereoselective synthesis of imidazolidin-2-ones via Pd-catalyzed alkene carboamination. Scope and limitations
作者:Jonathan A. Fritz、John P. Wolfe
DOI:10.1016/j.tet.2008.04.015
日期:2008.7
alkenyl bromides via Pd-catalyzed carboamination reactions is described. The N-allylurea precursors are prepared in one step from readily available allylic amines and isocyanates, and the Pd-catalyzed reactions effect the formation of a C-C bond, a C-N bond, and up to two stereocenters in a single step. Good diastereoselectivities are obtained for the conversion of substrates bearing allylic substituents
描述了一种从 N-烯丙基脲和芳基或烯基溴化物通过 Pd 催化的碳胺化反应合成 imidazolidin-2-ones 的方法。N-烯丙基脲前体由容易获得的烯丙基胺和异氰酸酯一步制备,Pd催化的反应在一步中形成CC键、CN键和多达两个立体中心。将带有烯丙基取代基的底物转化为 4,5-二取代的咪唑啉-2-酮获得了良好的非对映选择性,当底物衍生自环状烯烃或 E采用-1,2-二取代的烯烃。简要讨论了反应机理和产物立体化学。