Preparation of <i>N</i>-Alkyl 2-Pyridones via a Lithium Iodide Promoted <i>O</i>- to <i>N</i>-Alkyl Migration: Scope and Mechanism
作者:Sarah Z. Tasker、Michael A. Bosscher、Christina A. Shandro、Erica L. Lanni、Keun Ah Ryu、Gregory S. Snapper、Jarrad M. Utter、Bruce A. Ellsworth、Carolyn E. Anderson
DOI:10.1021/jo3015424
日期:2012.9.21
An efficient and inexpensive LiI-promoted O- to N-alkyl migration of 2-benzyloxy-, 2-allyloxy-, and 2-propargyloxypyridines and heterocycles is reported. The reaction produces the corresponding N-alkyl 2-pyridones and analogues under green, solvent-free conditions in good to excellent yields (30 examples, 20–97% yield). This method has been shown to be intermolecular and requires heat and lithium cation
报道了一种有效且廉价的LiI促进的2-苄氧基-,2-烯丙氧基-和2-炔丙基氧基吡啶和杂环的O-向N-烷基的迁移。在绿色,无溶剂的条件下,该反应可产生相应的N-烷基2-吡啶酮和类似物,收率好至极佳(30例,收率20-97%)。已经证明该方法是分子间的,并且需要热量和锂阳离子才能发生。