Synthesis of Quinolyl-Substituted Thiazolidines and Dihydrothiazoles Based on 2-{1-[2-Methyl-4-(methylsulfanyl)quinolin-3-yl]propan-2-ylidene}hydrazine-1-carbothioamides

New hetarylquinolines containing thiazolidine and dihydrothiazole rings have been synthesized from 2-{1-[2-methyl-4-(methylsulfanyl)quinolin-3-yl]propan-2-ylidene}hydrazine-1-carbothioamides sub­stituted at the benzene ring. The proposed method is simple, and it utilizes accessible and nontoxic starting materials. The synthesized compounds are promising due to their potential biological activity and other useful properties.