Direct Amination of Olefins through Sequential Triazolinedione Ene Reaction and Carbanion-Assisted Cleavage of the N−N Urazole Bond
作者:Waldemar Adam、Aurelia Pastor、Thomas Wirth
DOI:10.1021/ol000044c
日期:2000.5.1
yields by the base-catalyzed hydrolysis of trialkylated allylic urazoles 3; the latter are prepared by the TAD ene reaction of the appropriate olefin and further N-alkylation with alpha-bromoacetophenone. The proposed mechanism for this novel urazole rupture is based on the generation of a carbanion adjacent to the hydrazide functionality, which induces urazole ring-opening by cleavage of the N-N bond
通过碱催化的三烷基化烯丙基脲唑3的水解,可以得到总收率为30-55%的烯丙基胺5。后者是通过适当的烯烃的TAD烯反应,再与α-溴乙酰苯进行N-烷基化制备的。提出的这种新的脲唑断裂的机理是基于与酰肼官能团相邻的碳负离子的产生,其通过NN键的断裂诱导脲基开环。