The double Michael addition of 1,2-diamine to allenic or acetylenic nitriles has been shown to give imidazolines, benzimidazoles, or hexahydrobenzimidazoles in excellent yields via conjugated enaminic nitriles.
S. R. Landor, P. D. Landor, Z. T. Fomum and G. W. B. Mpango, J. Chem. Soc., Perkin Trans. 1, 1979, 2289 DOI: 10.1039/P19790002289
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