Reaction of equivalent amounts each of o-phenylenediamine and potassium cyanide with a number of αβ-unsaturated carbonyl compounds in the presence of acetic acid (3–5 mol. equiv.) provides a convenient new synthesis of tetrahydro-1H-benzo-1,5-diazepines.
J. S. Walia, L. A. Heindl, A. S. Walia and P. S. Walia, J. Chem. Soc., Chem. Commun., 1972, 962a DOI: 10.1039/C3972000962A
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