Isorhodanine and Thiorhodanine Motifs in the Synthesis of Fused Thiopyrano[2,3-d][1,3]thiazoles

Utilization of 4-thioxo-2-(thi)oxothiazolidines in the synthesis of new fused thiopyrano[2,3-d][1,3]thiazole derivatives under Knoevenagel and hetero-Diels-Alder reaction conditions has been studied.