Organocatalytic enantioselective formal synthesis of bromopyrrole alkaloids via aza-Michael addition
作者:Su-Jeong Lee、Seok-Ho Youn、Chang-Woo Cho
DOI:10.1039/c1ob06078c
日期:——
An unprecedented organocatalytic enantioselective formal synthesis of bromopyrrole alkaloid natural products is reported. An organocatalytic aza-Michael addition using pyrroles as the N-centered nucleophile is utilized as the enantioselective step to construct the nitrogen-substituted stereogenic carbon center in bromopyrrole alkaloids in good yield and excellent enantioselectivity. The aza-Michael
报道了前所未有的有机催化对映体形式的溴吡咯生物碱天然产物的合成。利用吡咯作为N-中心亲核试剂的有机催化氮杂-迈克尔加成反应被用作对映选择性步骤,以高收率和优异的对映选择性在溴吡咯生物碱中构建氮取代的立体碳中心。使用Staudinger型还原环化通过内酰胺化将aza-Michael产物转化为关键中间体,该中间体先前已用于溴吡咯生物碱天然产物的全合成。