Journal
JOURNAL OF HETEROCYCLIC CHEMISTRY
Volume 42, Issue 5, Pages 1001-1005Publisher
HETERO CORPORATION
DOI: 10.1002/jhet.5570420540
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Reaction of o-phenylenediamine with beta-diketones or beta-ketoesters in water formed 2-substituted benzimidazoles. Reaction of 3,3'-diaminobenzidine gave similar results. Under microwave irradiation conditions solvent-free reaction of o-phenylenediamine with beta-ketoesters afforded 1,5-benzodiazepin-2-one derivatives. An exception is the reaction of o-phenylenediamine with ethyl acetoacetate under microwave irradiation, which gave 2-methylbenzimidazole.
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