Acetic Acid → 4-(3-Phenoxypropyl]piperazinyl-1-phenylcyclohexanecarbonitrile

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Reaction Steps

5.0 g (0.025 mol) of 4-cyano-4-phenylcyclohexanone and 5.5 g (0.025 mol) of 3-phenoxypropylpiperazine were dissolved with 3.0 g of acetic acid in 70 ml of ethanol and then, while stirring at room temperature, a solution of 1.7 g (0.027 mol) of sodium cyanoborohydride was slowly added dropwise. The mixture was stirred overnight and then diluted with water and extracted with dichloromethane. The organic phase was subsequently washed with dilute acid (pH 4), dilute sodium hydroxide solution and water and finally dried and evaporated. The residue was converted into the hydrochloride with isopropanolic hydrochloric acid, and the product was recrystallized from isopropanol/water. Yield: 50%, C26H33N3O×2 HCl dihydrochloride, melting point >250° C.

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