Dimethylformamide dimethyl acetal → 8-Chloro-1-(2-chlorophenyl)-4-dimethylaminomethylidene-3,4-dihydro-2-benzazepin-5-one

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Reaction Steps

A mixture of 18.6 g (61 mmole) of 8-chloro-3,4-dihydro-1-(2-chlorophenyl)-5H-2-benzazepin-5-one and 149 ml of dimethylformamide dimethyl acetal was gently heated (ca 50°) for 12 hr. The mixture was concentrated at reduced pressure to dryness. The residue was crystallized from a mixture of ether and methylene chloride to give the end product as a yellow solid, mp 170°-171° C. Recrystallization from ether gave yellow prisms, mp 170°-171° C.

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