Reactions with Maleimides VII: Synthesis of Several New Pyrazolonyl-pyrrolidino[3,4-d]pyrazoline and Pyrazolonyl-pyrolo [3,4-d]pyrazole Derivatives

Several new pyrazoloyl-pyrrolidino[3, 4-d]pyrazolidines and pyrazolonyl-pyrrolo[3, 4-d] pyrazoles were synthesised via the reaction of N-arylaleimides with the phynylhydrazones of 3-methyl-4-formyl-2-pyrazoline-5-one and 1-phenyl-3-methyl-4-formyl-pyrazolin-5-one and treating of the resulting adducts with chloranil. Structures were based on elemental analyses and spectral data.