2-Aminopyridines as an α-Bromination Shuttle in a Transition Metal-Free One-Pot Synthesis of Imidazo[1,2-<i>a</i>
]pyridines
作者:Irwan Iskandar Roslan、Kian-Hong Ng、Gaik-Khuan Chuah、Stephan Jaenicke
DOI:10.1002/adsc.201501012
日期:2016.2.4
A wide range of imidazo[1,2‐a]pyridines are accessible from cheap and readily available 2‐aminopyridines and 1,3‐dicarbonyl compounds using a unique CBrCl3/2‐aminopyridine system for bromination at the α‐carbon. 2‐Aminopyridine is not only the substrate but also acts as a bromination shuttle, transferring the bromine atom from CBrCl3 to the α‐carbon of the 1,3‐dicarbonyl. The reaction mechanism involves
使用独特的CBrCl 3 / 2-氨基吡啶体系在α-碳上进行溴化,可以从便宜且容易获得的2-氨基吡啶和1,3-二羰基化合物中获得各种咪唑并[1,2- a ]吡啶。2-氨基吡啶不仅是底物,而且还用作溴化穿梭,将溴原子从CBrCl 3转移到1,3-二羰基的α-碳上。该反应机理涉及一系列可逆步骤,包括具有环状过渡态的加成反应,以形成溴血红素中间体。在这种无过渡金属的单锅合成中,在温和的条件下和较短的反应时间下,分离出的产率高达97%。