4,5,7,8,9,10-Hexahydropyrrolo[3,2,1-jk]carbazole with dimethyl acetylenedicarboxylate in wet acetic acid gave two pyrido[3,2,1-hi]indoles and two azepino[3,2,1-hi]indoles; one pyrido- and one azepino-indole were identified by X-ray crystallography and the other compounds by 1H and 13C n.m.r. spectral comparisons.
R. M. Acheson, R. M. Letcher and G. Procter, J. Chem. Soc., Chem. Commun., 1978, 332 DOI: 10.1039/C39780000332
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