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Three routes for the preparation of [1.4]diazepino[6.5-c]quinolines (1) have been studied. The best yields resulted by starting from the amides of N-(3-quinolylcarbonyl)-N-alkyl-amino acids (5). Quaternization to 9, intramolecular cyclization under the influence of base to 10, oxidation to 11 and debenzylation by catalytic hydrogenation gave 1.

Synthese und Reaktionen von [1.4]Diazepino[6.5-c]chinolinen / Syntheses and Reactions of [1.4]Diazepino[6.5-c]quinolines