1-Benzylpiperidin-4-ol → 4-[(1-Benzylpiperidin-4-yl)(4-chlorophenylsulfonyl)methyl]pyridine

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Reaction Steps

A toluene (5 ml) solution of the 4-(4-chlorophenylsulfonylmethyl)pyridine (70 mg, 0.261 mmol) obtained in Example 119, 1-benzylpiperidin-4-ol (103 mg, 0.538 mmol) and cyanomethylenetri-n-butylphosphorane (129 mg, 0.538 mol) was heated under reflux for 3 days under an argon atmosphere. After cooling to room temperature, the reaction mixture was added with 1-benzylpiperidin-4-ol (103 mg, 0.538 mmol) and cyanomethylenetri-n-butylphosphorane (129 mg, 0.538 mol), followed by heating under reflux for 22 hours under an argon atmosphere. After cooling to room temperature, the reaction mixture was concentrated under reduced pressure. The residue was subjected to flash chromatography on a silica gel column. The fraction obtained from the methanol:methylene chloride (=1:10) eluate was concentrated under reduced pressure. The residue thus obtained was purified by high performance liquid chromatography (using a mixed solvent of water/acetonitrile/formic acid), whereby the title compound (40 mg, 35%) was obtained as an amorphous substance.

Provenance & Evidence