Abstract
The reaction of p-benzoquinone with enamino amides derived from 2,2-dimethyl-1,2,3,4-tetrahydrobenzo[f]isoquinoline proceeds through a Michael addition. The reaction of this quinone with the base of drotaverine leads to a derivative of indolo[2,1-a]isoquinoline. Fusion of isoquinoline enamines by the action of 2,3-dichloro-1,4-naphthoquinone leads to pentacyclic benzo[g]naphtho-[2,3-b]indolyzine-8,13-dione.
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