α-C–H/N–H Annulation of Alicyclic Amines via Transient Imines: Preparation of Polycyclic Lactams
作者:Weijie Chen、Daniel Seidel
DOI:10.1021/acs.orglett.1c01125
日期:2021.5.7
Polycyclic lactams are prepared in a single operation from o-toluamides and cyclic amines in a process that involves transient cyclic imines, species that are conveniently obtained in situ from the corresponding lithium amides and simple ketone oxidants. Imines thus generated, such as 1-pyrroline and 1-piperideine, engage lithiated o-toluamides in a facile annulation process. Undesired side reactions
多环内酰胺是由邻甲苯酰胺和环状胺在单一操作中制备的,该过程涉及瞬态环状亚胺,该物质可以方便地从相应的氨基锂和简单的酮氧化剂原位获得。由此产生的亚胺,例如1-吡咯啉和1-哌啶,在轻松的成环过程中与锂化邻甲苯酰胺结合。通过明智地选择反应条件,可以抑制不需要的副反应,例如亚胺去质子化和邻甲苯酰胺二聚化。