Hexane → 4-Chloro-3-[1-(4-chlorophenylsulfonyl)cyclohexyl]pyridine

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Reaction Conditions

Reaction Steps

At −78° C., butyl lithium (a 1.57M hexane solution; 0.58 ml, 0.913 mmol) was added dropwise to a dimethoxyethane (5 ml) solution of the 4-chloro-3-(4-chlorophenylsulfonylmethyl)pyridine (138 mg, 0.457 mmol) obtained in Example 104. At −78° C., the resulting mixture was stirred for 20 minutes and then 1,5-diiodopentane (0.068 ml, 0.457 mmol) was added thereto. The temperature of the reaction mixture was gradually raised to room temperature, at which stirring was performed for 17 hours. Water was added to the reaction mixture, followed by extraction with ethyl acetate. The organic layer was washed with brine and then dried over anhydrous sodium sulfate. After filtration, the filtrate was concentrated under reduced pressure. The residue was subjected to flash chromatography on a silica gel column, and the fraction obtained from the hexane:ethyl acetate (=2:1) 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) to give the title compound (30 mg, 18%) as a white solid. The resulting solid was washed with ether and then collected by filtration, whereby the title compound was obtained as a white powder.

Provenance & Evidence