GSC  Vol.2 No.2 , May 2012
Aspects on the Mechanism of the 1-Phenyl-1H-pyrazolo[3,4-b]quinoxaline Formation
Condensation of D-glucose, o-phenylenediamine and N,N-benzylphenylhydrazine hydrochloride (NNBPHH) in a one-pot reaction, or condensation of 2-(D-arabino-tetritol-1-yl) quinoxaline and NNBPHH, gave 3-(D-erythro-glycerol-1- yl)-1-phenyl-1H-pyrazolo[3,4-b]quinoxaline. The structure of the latter was determined by 1H NMR spectroscopy and by synthesis using phenylhydrazine hydrochloride instead of NNBPHH. Condensation of D-glucose and 4,5-dichloro-o-phenylenediamine gave 6,7-dichloro-2-(D-arabino-tetritol-1-yl)quinoxaline, which upon condensation with NNBPHH gave the corresponding 6,7-dichloro-3-(D-erythro-glycerol-1-yl)-1-phenyl-1H-pyrazolo[3,4-b]quinoxaline. The structure and mechanism of formation of these compounds are discussed.

Cite this paper
M. A. Mostafa, S. L. Aboulela, M. A. E. Sallam, F. F. Louis and T. Anthonsen, "Aspects on the Mechanism of the 1-Phenyl-1H-pyrazolo[3,4-b]quinoxaline Formation," Green and Sustainable Chemistry, Vol. 2 No. 2, 2012, pp. 71-75. doi: 10.4236/gsc.2012.22012.
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