N. Tavakoli-Hoseini, Raheleh Moloudi, A. Davoodnia
Nov 1, 2011
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0
Influential Citations
21
Citations
Journal
Chinese Journal of Chemistry
Abstract
A convenient and efficient method for the synthesis of pyrazolo[3,4-d]pyrimidin-4-ones via heterocyclization reaction of 5-amino-1H-pyrazole-4-carboxamides with triethyl orthoesters using two Br?nsted-acidic ionic liquids, 3-methyl-1-(4-sulfonic acid)butylimidazolium hydrogen sulfate [MIM+(CH2)4SO3H][HSO4−] or N-(4-sulfonic acid)butyl triethylammonium hydrogen sulfate [Et3N+(CH2)4SO3H][HSO4−], as efficient homogeneous catalysts under solvent-free conditions is described.