Heterocyclization of vic-Substituted Hydroxamic Acid Salts of Acetylenylpyrazoles: A New Procedure for the Preparation of Pyrazolo[3,4-c]pyridin-7-ones
作者:José Elguero、Sergei F. Vasilevsky、Elena V. Mshvidobadze
DOI:10.3987/com-02-9572
日期:——
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.