Electroreduction of some arylazothiocardbomyl - pyrazoles

The electrochemical polarographic reduction behavior of some 3, 5-dimethyl-4- arylazo-N-thiocarbomylpyrazoles has been studied in 40% DMF [v/v]. Britton-Robinson buffers reduction took place by a 2-electron diffusion-controlled process characterized by a single well-defined irreversible wave at mercury or glassy carbon electrodes over the entire pH range of study [pH = 2.3 - 11.4]. The electrochemical parameters were obtained by fitting the experimental C-V curves with theoretical ones generated by variation of parameters. Based on the results of d.c. polarography, cyclic voltammetry, coulometry, chronoamperometric and convolution techniques, a feasible reaction mechanism has been proposed

Activated nitriles in heterocyclic synthesis: synthesis of substituted pyrazolopyridine, pyridine, 4H-pyran and naphthodiapyran derivatives

Several new pyrazolopyridines VIa-c were synthesized by reacting 4-nitrosoantipyrine [IIa] with arylidenemalononitriles Ia-c or ethyl arylidenecyanoacetates If-h. Reaction of Ia-c with 4-[azidomethylcarbonyl] antipyrine [IIb] afforded the pyridine derivatives XVI. The 4H-pyrans and naphthodipyran derivatives XVIII- XXI were prepared by reacting I with polyhydric phenols

Hydrazidoy halides in heterocyclic synthesis: Synthesis of several new polyfunctional pyrazole and 1,2,4-Triazole derivatives via dipolar cycloduction reactions on the corresponding nitrile imines

The nitrile imine generated by the action of triethylamine on 2-bromo-1-benzofurylglyoxal-2-[3 phenylpyrazol 5-yl]-hydrazone reacted with some Schiff bases, -nitrostyrenes and thiocarboxamidocinnamonitrile derivatives via dipolar cycloaddition reactions to yield several new polyfunctional pyrazole and 1,2,4-triazole derivatives. Structures were confirmed by elemental analysis and spectral data studies

Synthesis of some new pyrazolones as potent anti-inflammatory agents

A series of 1,2-diphenyl-3,5-bis [alkyl and /or aryl amino] pyrazolium perchlorates [2a-e] 1,2-diphenyl-3-substituted 5-pyrazolones 3a-c, 4a-c, 6 and 1,2 diphenyl-5-pyrazolone Schiff's bases 7a-d were prepared. Some of the prepared compounds were tested for their antiinflammatory, analgesic, and antipyretic activities