Synthesis of Imidazo[1,2-a]pyridines from Pyridines and p-Bromophenacyl Bromide O-Methyloxime

Abstract

p-Bromophenacyl bromide O-methyloxime reacts with pyridines in acetone to form the corresponding pyridinium salts which, when heated in methanol in the presence of Et3N, undergo cyclization followed by elimination of MeOH to give imidazo[1,2-a]pyridines.