Synthesis and characterization of new 3,5-disubstituted-4,5-dihydro-1H-pyrazole and their carbothioamide derivatives

Abstract

A new series of substituted pyrazolines (6‐10) were synthesized in moderate to excellent yield by treatment of chalcones (1‐5) with hydrazine monohydrate. The carbothioamide compounds (11‐14) were obtained in 65% to quantitative yield by treatment of chalcones (2, 4, and 5) either with thiosemicarbazide or with phenylisothiocyanate. All new compounds were characterized by various spectroscopic methods such as 1 H NMR, 13 C NMR, DEPT, COSY, HSQC spectroscopy, elemental analysis, and high resolution mass spectroscopy. The obtained compounds are currently under biological investigations, and the results will be reported elsewhere.