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
(N,N-二甲基氨基)吡啶与异氰酸酯之间的反应出乎意料地产生了三组分混合物。通过将该混合物用作空前的三组分催化剂体系,已经开发了烯烃酰胺的容易和选择性的溴内酰胺化。该协议赋予了N-相对于O-环化更高的选择性,从而导致形成结构多样的内酰胺,包括中小环大小。