Intramolecular Mannich and Michael Annulation Reactions of Lactam Derivatives Bearing Enals To Afford Bicyclic N-Heterocycles
作者:Yarkali Krishna、Kola Shilpa、Fujie Tanaka
DOI:10.1021/acs.orglett.9b03210
日期:2019.10.18
Acid-catalyzed intramolecular vinylogous Mannich reactions and intramolecular Michael reactions affording pyrrolizinone-fused N-heterocycles from hydroxylactam derivatives bearing enals have been developed. Depending on the substituent on the hydroxylactam, the enal moiety acted either as a nucleophile (i.e., as an enol/enolate) or as an electrophile to react with the N-acyliminium ion or enamide generated
已经开发了酸催化的分子内乙烯基曼尼希反应和分子内迈克尔反应,其从带有烯醛的羟基内酰胺衍生物提供吡咯烷酮稠合的N-杂环。取决于羟基内酰胺上的取代基,烯醛部分充当亲核试剂(即,作为烯醇/烯醇酸酯)或亲电子试剂,以分别与由羟基内酰胺部分生成的N-酰基亚胺离子或烯酰胺反应。在具有5至8元环的稠合N-杂环的构建中证明了反应。