Access to Imidazo[1,2-<i>a</i>]pyridines via Annulation of α-Keto Vinyl Azides and 2-Aminopyridines
作者:Praveen Reddy Adiyala、Geeta Sai Mani、Jagadeesh Babu Nanubolu、Kunta Chandra Shekar、Ram Awatar Maurya
DOI:10.1021/acs.orglett.5b02124
日期:2015.9.4
synthesis of imidazo[1,2-a]pyridines via efficient catalyst/metal-free annulations of α-keto vinyl azides and 2-aminopyridines is described. Several imidazo[1,2-a]pyridines were synthesized from readily available vinyl azides and 2-aminopyridines and obtained in highly pure form by simply evaporating the reaction solvent. This remarkably high yielding and atom economical protocol allows the formation of three
描述了一种通过α-酮乙烯基叠氮化物和2-氨基吡啶的有效无催化剂环合反应合成咪唑并[1,2- a ]吡啶的新策略。从容易获得的乙烯基叠氮化物和2-氨基吡啶合成了几种咪唑并[1,2- a ]吡啶,并通过简单地蒸发反应溶剂以高纯度形式获得。这种极高的产率和原子经济的方案允许通过级联反应和重排形成三个新的C–N键。