Mitt. XV: Struktur und reaktivität von isoanellierten heterocyclischen systemen mit 4nπ‐ und (4n + 2) π‐elektronen. 2‐t‐butyl‐4‐methyl‐2,4‐dihydropyrrolo[3,4‐b]indole. reaktionen mit aktivierten CC‐dienophilen

Reactions of 2‐t‐butyl‐4‐methyl‐2,4‐dihydropyrrolo[3,4‐b]indoles with N‐aryl‐maleimides have been investigated. The formation of 1:1‐cycloadducts is influenced by substituents at 1,3‐position. The consecutive transformations of these intermediates can be controlled by nucleophilic solvents or reagents. Ring opening reactions occur at the labile N,O‐acetal group of the cycloadducts followed by eliminaton or addition reactions.