Benzoyl chloride → N-[4-(1-benzoyl-4-piperidinyl)butyl]-3-(3-pyridinyl)-2-propenamide

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Reaction Steps

5.1 g (36.2 mMol) benzoyl chloride are dissolved in 150 ml abs. dichlormethane and cooled to ca 0° C. under moisture exclusion. 10.4 g (36.2 mmol) N-[4-(piperidin-4-yl)-butyl]-3-(pyridin-3-yl)-acrylamide (substance 14) are dissolved in 50 ml abs. dichlormethane and added dropwise under ice cooling. The mixture is stirred overnight at RT without further cooling. Subsequently, the suspension is added to 60 ml 2 M sodium hydroxide and extracted twice, each with 80 ml dichlormethane. The combined organic phases are washed twice, each with 60 ml water, dried over sodium sulfate and the solvent is removed under vacuum. The residue is chromatographically purified over silica gel with CHCl3/CH3OH (97/3 to 95/5) and recrystalized from 75 ml acetonitrile. Colorless crystals with a MP of 100–102° C. are recovered; yield: 9.8 g (69%).

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