Hydrazidoyl halides in heterocyclic synthesis.II+: Synthesis of several new pyrazole, pyrazolo [5,1-c] 1,2,4-Triazine, pyrimidine and thiazole derivatives

Several new pyrazole, pyrazolo [5, 1-c]-1, 2, 4-triazine, pyrimidine and thiazole derivatives were synthesised by the reactions of 2-bromo-1-benzofurylglyoxal-2-[3-phenyl-pyrazol-5-yl]-hydrazone with a variety of reagents. Structures were established by elemental and spectral data

Hydrazidoyl halides in heterocyclic synthesis.III+: synthesis of several new pyrazole pyrrolino [3,4-c] pyrazoles and pyrazolo [3,4-d] pyridazine, derivatives via dipolar cycloaddition reactions

A variety of new pyrazole, pyrrolinopyrazole and pyrazolopyridazine derivatives were synthesised via the dipolar cycloaddition reactions of acrylonitrile, ethyl acrylate and N-arylmaleimides with the nitrile imine regenerated from 2-bromo-1- benzofurylglyoxal-2-[3-phenylpyrazol-5-yl]-hydrazone. Structure of the newly synthesized derivatives were established on the basis of elemental analysis and spectral data