Journal of Organic Chemistry p. 3072 - 3077 (1980)
Update date:2022-08-04
Topics:
Foster, Robert H.
Leonard, Nelson J.
Pyrazolo<3.4-f>quinazolin-9-one (prox-benzoisoallopurinol, 1), an extented analogue of 7-hydroxypyrazolo<4,3-d>pyrimidine (isoallopurinol, 2) and a potential dimensional probe for substrates of xanthine oxidase, has been synthesized by two independent routes.The title compound, prepared by elaboration of either a suitably substituted indazole or a quinazolinone, was found to be an active substrate for and an alternative-substrate inhibitor of xanthine oxidase.The product of enzymatic oxidation of prox-benzoisoallopurinol has been identified as the corresponding prox-benzoisoalloxanthine.
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