A Diversity-Oriented Approach to Spirocyclic and Fused Hydantoins via Olefin Metathesis
作者:Kalyan Dhara、Ganesh Chandra Midya、Jyotirmayee Dash
DOI:10.1021/jo301234r
日期:2012.9.21
diverse series of 5,5-spirocyclic and 1,5-, 4,5-, and 3,4-fused bicyclic imidazolidinone derivatives based on selective alkylation and ring closing metathesis (RCM) by exploiting the four possible points of diversity in the hydantoin ring. Hydantoins containing trienes and tetraenes undergo selective RCM and cross metathesis to afford functionalized spirohydantoins. A tandem metathesis sequence involving
据报道,一种有效而通用的方法是通过选择性烷基化和闭环复分解(RCM)制备一系列5,5-螺环和1,5-,4,5-和3,4-稠合的双环咪唑烷酮衍生物。利用乙内酰脲环的四个可能的多样性点。含有三烯和四烯的乙内酰脲经历选择性RCM并交叉易位,以提供官能化的乙二乙内酰脲。与乙内酰脲三烯发生串联复分解序列,包括闭环-开环-闭环和交叉复分解(RC-RO-RC-CM),从而以高收率得到双环乙内酰脲二聚体。融合的双环二聚体可以参与交叉复分解以产生功能化的融合的乙内酰脲衍生物。该方法学建立了通往非天然氨基酸,脯氨酸同系物和环状邻位二胺的新途径。