Reactions with hydrazonoyl halides XXII: Synthesis of pyrrolo[3,4-C]pyrzoline, pyrazoline, pyrazole, and 2,3-dihydro-1,3,4-thiadiazole derivatives

5-Bromoacetyl-4-methyl-2-phenylthiazole reacted with dimethylsulfide, potas sium thiocyanate, sodium benzenesulfinate and thiourea to afford products 2 -5, respectively. Hydrazonoyl bromides 7a-c obtained via reaction N-nitroso arylacetamides with sulfonium bromide 2. Hydrazonoyl bromides were used in synthesis of pyrrolidinopyrazolione, pyrazole, triazoline, thiadiazoline an d 5-arylazothiazole derivatives. The structure of the newly synthesized com pounds were confirmed on the basis of spectral, analytical analyses and alt ernative route whenever possible.