Triethylamine → 2-[4-(3-[(2S)-1-cyclohexylmethylsulfonyl-2-piperidyl]-1,2,4-oxadiazol-5-ylmethoxy)benzyl]-1,3-isoindolinedione

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Cyclohexylmethanesulfonyl chloride (359 mg) [King. J. F. et al., J. Am. Chem. Soc., 1992, 114(5), 1743-9] was added to a solution of 2-[4-(3-[(2S)-2-piperidyl]-1,2,4-oxadiazol-5-ylmethoxy)benzyl]-1,3-isoindolinedione hydrochloride (627 mg) [see Preparation 153 and triethylamine (0.4 ml) in dichloromethane (2 ml). The reaction mixture was stirred at room temperature for 18 hours after which time it was heated to 30° C. and stirred for a further 56 hours. The mixture was diluted with dichloromethane and washed with dilute aqueous hydrochloric acid solution, the organic layer dried over magnesium sulphate and the solvent removed under reduced pressure. The crude product was purified by column chromatography on silica gel eluting with a solvent gradient of 100:0 changing to 75:25, by volume, hexane:ethyl acetate to afford 2-[4-(3-[(2S)-1-cyclohexylmethylsulfonyl-2-piperidyl]-1,2,4-oxadiazol-5-ylmethoxy)benzyl]-1,3-isoindolinedione (192 mg).

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