With acetylenedicarboxylic esters benzocinnoline N-alkylimides (1) give dibenzoimidazolinodihydro-diazepines (4), which rearrange to 1-(2′-aminobiphenyl-2-yl) imidazoles (5) with acid; the latter undergo novel internuclear cyclisations upon attempted deamination.
M. J. Rance, C. W. Rees, P. Spagnolo and R. C. Storr, J. Chem. Soc., Chem. Commun., 1974, 658 DOI: 10.1039/C39740000658
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