Abstract
The reaction of 1-heteroaryl-3-(tetrazolo[1,5-a] quinolin-4-yl) prop-2-en-1-ones with hydrazine hydrate in either ethanol or acetic acid furnished pyrazoline and N-acetylpyrazoline, respectively. N-phenylpyrazolines and pyrazoline-N-carbothioamides were synthesized, in good yields, from reaction of chalcons with phenylhydrazine and thiosemicarbazide, respectively. On the other hand, a series of 2-pyrazolin-1-ylthiazoles have been synthesized via cyclization of pyrazoline-N-carbothioamides with different alpha-haloketones such as phenacyl bromides, 3-bromoacetylcoumarin, hydrazonoyl chlorides, and alpha-chloroacetic acid. The structures of the newly synthesized compounds have been confirmed by spectral analyses also the in vitro antimicrobial activities were studied.