An Improved Synthesis of 2-Chlorinated Imidazo[1,2-α]-pyridines and the Application of this Procedure for the Synthesis of Several New Polychlorinated Imidazo[1,2-α]Pyridnes.
摘要:
Polychlorinated imidazo[1,2-a]pyridines were synthesized as analogs of certain chlorinated benzimidazoles. The imidazo[1,2-a]pyridines were obtained by a condensation of ethyl bromoacetate and chlorinated 2-aminopyridines. These condensation products were treated with an ion exchange resin to effect an exchange of hydrobromide salts with hydrochloride salts. These compounds were subsequently treated with POCl3 to convert the imidazo[1,2-a]pyridin-2-ones into 2-chloroimidazo[1,2-a]pyridines.