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Paper | Regular issue | Vol 57, No. 12, 2002, pp.2255-2260
Published online, 1st January, 1970
DOI: 10.3987/COM-02-9572
Heterocyclization of vic-Substituted Hydroxamic Acid Salts of Acetylenylpyrazoles: a New Procedure for the Preparation of Pyrazolo[3,4-c]pyridin-7-ones

Sergei F. Vasilevsky,* Elena V. Mshvidobadze, and José Elguero*

*Instituto de Química Médica, C. S. I. C., Calle Juan de Cierva, 3, 28006 Madrid, Spain

Abstract

Procedures for the preparation of 5-substituted pyrazolo[3,4-c]pyridin-7-ones and 5-substituted 6-hydroxypyrazolo[3,4-c]pyridin-7-ones have been developed based on heterocyclization of vic-acetylenylpyrazolylhydroxamic acids under the influence of copper(I) salts in dimethylformamide or with organic bases in butanol or methanol.