Improved Method for the Preparation of 3-Aryl- and 3-Styrylimidazo[1,5-a]pyridines

A new convenient method is proposed for the preparation of 3-aryl- and 2-styrylimidazo[1,5-a]pyridines involving the cyclocondensation of 2-(acylaminobenzyl)pyridines in acetic anhydride with adding of p-toluenesulfonic acid.