Dimethyl allene-1,3-dicarboxylates react with o-phenylenediamine to give 1H-1, 5-benzodiazepinones and not benzimidazoles; the transient enamine intermediate shows preference for a 7-exo-trig ring closure.
J. Ackroyd and F. Scheinmann, J. Chem. Soc., Chem. Commun., 1981, 339 DOI: 10.1039/C39810000339
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