作者:Francesca Olimpieri、Maria Cristina Bellucci、Alessandro Volonterio、Matteo Zanda
DOI:10.1002/ejoc.200900868
日期:2009.12
An efficient and straightforward two-step procedure for the synthesis of N-1 alkyl/aryl-substituted hydantoins was developed, starting from easily available starting materials. The procedure envisages a highly regiospecific domino condensation/aza-Michael (nucleophilic substitution)/ON acyl migration between activated α,β-unsaturated carboxylic acids or α-haloaryl acetic acids, respectively, and N-tert-butyl-
开发了一种高效且直接的两步法合成 N-1 烷基/芳基取代的乙内酰脲,从容易获得的起始材料开始。该程序设想了高度区域特异性的多米诺缩合/氮杂-迈克尔(亲核取代)/ON酰基迁移,分别在活化的α,β-不饱和羧酸或α-卤代芳基乙酸与N-叔丁基或N-三苯甲基碳二亚胺之间,导致区域选择性形成在 3 位带有叔烷基取代基的乙内酰脲,然后选择性去除取代基。该过程避免使用苛刻的反应条件和有毒试剂,并且收率高。详细研究了反应物的结构对反应结果的影响。种类繁多的最终产品具有初级、该方法成功合成了N-1位的二级、环状和芳基取代基。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)