Abstract
AbstractNew tetracyclic systems containing a pyrrolobenzodiazepine 5 or a pyrrolobenzotriazepine 6 moiety bounded by a spiro linkage to the piperidine nucleus are described. They have been synthesized by a simple reaction involving the interaction between proper aromatic amines and 4‐oxopiperidines substituted or not at the 1‐position in the presence of maleic acid as a catalyst. The synthesis of spiropyrrolo[1,2‐a]quinoxaline‐2,4′‐piperidine 7 and its 1′‐acyl derivatives by the same procedure is also reported.
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