m-Nitrophenylguanidines, which carry a vicarious leaving group, cyclize under basic conditions yielding nitrobenzimidazoles. Preliminary observations of the regioselectivity of the ring closure reaction are reported.
F. Esser, P. Ehrengart and H. Peter Ignatow, J. Chem. Soc., Perkin Trans. 1, 1999, 1153 DOI: 10.1039/A900553F
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