Dimethylformamide → 1,2-Dibenzoyl-5-[4,4-bis(4-fluorophenyl)butyl]-hexahydro-1H-1,2,5-triazepin

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A mixture of 4,4-bis(4-fluorophenyl)butyl bromide (2.08 g), 1,2-dibenzoyl-1H-1,2,5-triazepine (2.0 g), powdered anhydrous sodium carbonate (2.71 g) and N,N-dimethylformamide (20 ml, dried over 4A molecular sieves) was stirred at room temperature under a nitrogen atmosphere for three days. The mixture was filtered and the filtrate was evaporated under oil pump vacuum to an oil. The oil was chromatographed on a column of silica gel; elution with ethyl acetate-dichloromethane (2:3) giving a major product. The hydrochloride salt of the titled compound was formed in ether from this material; wt. 2.0 g (52%), mp=216°-218°.

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