The solid acid, Amberlyst-15® immobilized in the air- and moisture-stable ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate is found to catalyze efficiently the condensation of o-phenylenediamines with ketones under mild conditions to afford the corresponding 1,5-benzodiazepine derivatives in high yields with high selectivity.
J. S. Yadav, B. V. S. Reddy, B. Eshwaraiah and K. Anuradha, Green Chem., 2002, 4, 592 DOI: 10.1039/B206558B
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