An addition reaction of ω-alkenylmagnesium bromide with p-toluenesulfonyl isocyanate and consecutive oxidative cyclization with iodobenzene diacetate afforded brominated lactams in one-pot. An imine was also applicable to a one-pot synthesis of terminally brominated cyclic amine.
An unexpected Bromolactamization of Olefinic Amides Using a Three-Component Co-catalyst System
作者:Yi An Cheng、Wesley Zongrong Yu、Ying-Yeung Yeung
DOI:10.1021/acs.joc.5b02390
日期:2016.1.15
between (N,N-dimethylamino)pyridine and isocyanate unexpectedly produced a three-component mixture. By using this mixture as an unprecedented three-component catalyst system, a facile and selective bromolactamization of olefinic amides has been developed. The protocol confers enhanced selectivity of N- over O-cyclization, leading to the formation of a structurally diverse range of lactams including both small