M. Jachak, A. B. Avhale, Chanda D. Tantak
Nov 1, 2005
Citations
0
Influential Citations
46
Citations
Journal
Journal of Heterocyclic Chemistry
Abstract
sized by Friedlander condensation of 5-aminopyrazole-4-carbaldehydes 3 with α-methylene ketones such as acetone (4a) or acetophenones 4b-f with potassium hydroxide as basic catalyst. Condensation of 5-aminopyrazole-4-carbaldehydes 3 and unsymmetric dialkylketones 6 yielded mixtures of isomeric pyrazolo[3,4-b]pyridine derivatives 7 and 8. Condensation of 5-aminopyrazole-4-carbaldehydes 3 with CHacidic acylacetonitriles 9 and acylacetates 11 with piperidine as basic catalyst yielded pyrazolo[3,4-b]pyridine-5-carbonitriles 10 and pyrazolo[3,4-b]pyridine-5-carboxylates 12; with diethyl malonate 13 as CHacidic component, pyrazolo[3,4-b]pyridin-6-ones 14 were obtained.