Tetrahedron

A new route to pyrazolo [3, 4-c] and [4, 3-c] pyridinones via heterocyclization of vic-substituted hydroxamic acids of acetylenylpyrazoles

EV Mshvidobadze, SF Vasilevsky, J Elguero

Index: Mshvidobadze, Elena V.; Vasilevsky, Sergei F.; Elguero, Jose Tetrahedron, 2004 , vol. 60, # 51 p. 11875 - 11878

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Citation Number: 8

Abstract

We report in this paper the synthesis of 6-substituted pyrazolo [4, 3-c] pyridin-4-ones, 6- substituted 5-hydroxypyrazolo [4, 3-c] pyridin-6-ones, 5-substituted pyrazolo [3, 4-c] pyridin-7- ones and 5-substituted 6-hydroxypyrazolo [3, 4-c] pyridin-7-ones by heterocyclization of vic- acetylenylpyrazol-hydroxamic acids under the influence of copper (I) salt in dimethylformamide or with organic bases in butanol or methanol.