作者:Sharada S. Labadie、Karine Thai、Jessica M. Grandner、Yanzhou Liu、Brendan T. Parr
DOI:10.1021/acs.joc.1c00688
日期:2021.10.15
Herein we present an investigation into the scope and mechanism for the synthesis of cyclopentyl and heterocyclic fused pyridones from the corresponding enyne amides. In the presence of a secondary amine, cyclization proceeds smoothly to form 5,6-bicyclic pyridones in 12–90% yield. The cyclization fails with enyne amides of six-membered and larger ring systems. The ring closure reaction is catalytic
在此,我们对从相应的烯炔酰胺合成环戊基和杂环稠合吡啶酮的范围和机制进行了研究。在仲胺的存在下,环化顺利进行,以 12-90% 的产率形成 5,6-双环吡啶酮。六元和更大环系统的烯炔酰胺环化失败。闭环反应对于仲胺而言本质上是催化性的,并且通过胺的顺序1,6-加成、亚胺中间体的6-外-三环闭环以及随后的仲胺的消除进行。计算表明,对于六元和更大的系统,烯炔和酰胺之间的共轭减少,从而为此类烯炔酰胺无法形成稠合吡啶酮提供了解释。