Indole β-nucleophilic substitution. Part 6. Photochemical transformations of oxepino[3,2-b]indolones

Abstract

[2]Benzoxepino[4,3-b]indol-11-ones and pyrido[x′,y′:5,6]oxepino[3,2-b]indol-5-ones are transformed in the presence of light into indole-spiro(2-alkyl-2-aroyl)-3-ones. These, in the presence of air, in alcohol as solvent (or in some cases with alcoholic sodium alkoxide) are further converted into indolo[1,2-b]isoquinoline-6,12-diones and aza-analogues respectively.