Facile Synthesis of Thiazolidin-4-one Derivatives Incorporating Indole Moiety

Condensation of ethyl 3-formyl-1h-indole-2-carboxylate (1) with thiosemicarbazide in ethanol gave ethyl 3-(thiosemicarbazidomethyl)-1h-indole-2-carboxylate (2). treatment of 2 with chloroacetic acid afforded the thiazolidin-4-one derivative 3. condensation of 3 with aromatic aldehydes gave the corresponding arylidene derivatives 4a-c. cyclization of 4a-c with hydroxylamine hydrochloride in the presence of sodium acetate yielded thiazolidino[4,5-c]isoxazoline derivatives 5a-c. the structure of the synthesized compounds were confirmed using elemental and spectroscopic analysis.