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Wittig reactions of imidazole-2- and 4(5)-carboxaldehyde yield the compounds 3 and 4. These vinyl ketones react with N,N-dimethylformamide-dimethylacetal to produce the eneamino-ketones 5 and 6, which are converted into the imidazo-azepine-7-ones (7) and 8.

7H-Imidazo[1.2-a]-und -[1.5-a]azepin-7-one / 7H-Imidazo[1,2-a]-and -[1,5-a]azepine-7-ones