Novel trifluoromethyl-thieno[2,3-b]pyridine-2-carboxamide and Schiff’s base derivatives and their anticancer activity

A series of novel trifluoromethyl-thieno[2,3-b] pyridine-2-carboxamide 3a-h and Schiff’s base derivatives 5a-g was prepared starting from 6-methyl-2-oxo-4-(trifluoromethyl)-1,2-dihydropyridine-3-carb onitrile 1. Compound 1 on reaction with bromoethyl acetate produced ester derivative 2 on reaction with different amines produced amide derivatives 3. Ester derivative 2 which on reaction with hydrazine hydrate gave hydrazide 4 derivative. Further this compound on reaction with different substituted aromatic aldehydes formed Schiff’s base derivatives 5. All the products 3a-h and 5a-f were screened against four human cancer cell lines such as HeLa -Cervical cancer (CCL-2), COLO 205-Colon cancer (CCL-222), HepG2-Liver cancer (HB-8065) and MCF7-Breast cancer (HTB-22). Promising compounds 3a and 3c have been identified with reference to standard control of 5-Fluorouracil.