N-Allyl-N′-arylacetamidines have been cyclised, as their hydrochlorides, to 1-aryl-2,5-dimethyl-Δ2-imidazolines and, in polyphosphoric acid, to 3,4-dihydro-4-ethyl-2-methylquinazolines together with, in certain cases, 4,5-dihydro-2,5-dimethyl-3H-1,3-benzodiazepines.
M. W. Partridge and A. Smith, J. Chem. Soc., Perkin Trans. 1, 1973, 453 DOI: 10.1039/P19730000453
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