Two series of compounds namely, 4-aryl/heteroaryl hydrazino-3-acetyl-6-methyl-2H-pyran-2- ones (4a–4j) and pyrano [4, 3-c] pyrazoles (6a–6e and 6g) were synthesized starting from 3- acetyl-4-chloro-6-methyl-2H-pyran-2-one (2). Estimation of pharmacotherapeutic potential, possible molecular mechanism of action, toxic/side effects and interaction with drug- metabolizing enzymes were made for the synthesized compounds on the basis of ...