Abstract

Reaction 1H-indole-3-carboxaldhyde 1 with thiosemicarbazide derivatives to give thiosemicarbazone derivatives 2a,b. Cyclization of thiosemicarbazone 2a with HCl, Ac2O, phenacyl bromides and chloroacetic acid afforded the corresponding 1,2,4-triazole-3-thiol derivative 3, diacetyl derivative 4 and 1,3-thiazole derivative 5 and 1,3-thiazolidin-4-ones derivative 6 respectively. Compound 6 undergoes a series of heterocyclization reactions to give new heterocyclic compounds. The structure of the newly synthesized compounds had been confirmed by elemental analysis and spectra data. The some newly synthesized compounds were evaluated for in vitro cytotoxic activity against three human cancer cell lines, including human liver cancer (HepG2), human colon cancer (HT-29) and human breast cancer (MCF-7) using MTT assay.