An Efficient One-Pot Regioselective Approach Towards the Synthesis of Thiopyrano[2,3-d]thiazole-2-thiones Catalyzed by Basic Ionic Liquid under Microwave Irradiation

A green, regioselective protocol for the synthesis of thiopyrano[2,3-d]thiazole-2-thiones catalyzed by basic ionic liquid [bmIm]OH has been developed. The reaction proceeds smoothly under microwave irradiation, and high yields of the products are obtained in very short reaction times (5–11 min). The ionic liquid plays a dual solvent-catalyst role.