Stable Bromiranium Ion Salts as Reagents for Biomimetic Indole Terpenoid Cyclizations
作者:Jonathan Bock、Constantin G. Daniliuc、Ulrich Hennecke
DOI:10.1021/acs.orglett.9b00259
日期:2019.3.15
Indole terpene alkaloids are a diverse group of natural products and show significant biological activities. To enable their biomimetic synthesis, electrophilic bromocyclization of polyenyl indole derivatives could be achieved using sterically demanding bromiranium ion salts with the weakly coordinating counterion BArF– as reagent. Starting from polyenyl indole derivatives, the corresponding bromocyclization
吲哚萜烯生物碱是各种各样的天然产物,并显示出显着的生物学活性。为了实现仿生合成,可以使用空间需求的溴化铵离子盐和弱配位抗衡离子BArF –作为试剂,实现多烯基吲哚衍生物的亲电子溴环化。从多烯吲哚衍生物开始,已经以非常高的非对映选择性和良好的收率获得了相应的溴环化产物。