6H-Pyrido[x′,y′ : 5,6]oxepino[3,2-b]indol-5-(12H)-ones (3) are efficiently converted by hot alcoholic base in air into the corresponding 5H-pyrido[x,y-b]-carbazole-5,11(6H)-diones (5).
W. R. Ashcroft, M. G. Beal and J. A. Joule, J. Chem. Soc., Chem. Commun., 1981, 994 DOI: 10.1039/C39810000994
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