[F:1][C:2]1([CH2:15][OH:16])[CH2:7][CH2:6][N:5]([C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[CH2:4][CH2:3]1.C(N(CC)CC)C.[CH3:24][S:25](Cl)(=[O:27])=[O:26]>ClCCl>[F:1][C:2]1([CH2:15][O:16][S:25]([CH3:24])(=[O:27])=[O:26])[CH2:3][CH2:4][N:5]([C:8]([O:10][C:11]([CH3:12])([CH3:13])[CH3:14])=[O:9])[CH2:6][CH2:7]1tert-Butyl 4-fluoro-4-(hydroxymethyl)piperidine-1-carboxylate (0.150 g, 0.643 mmol) was dissolved in dichloromethane (1.8 mL) and cooled to 0° C. The solution was treated with triethylamine (0.134 ml, 0.964 mmol) followed by methanesulfonyl chloride (0.0547 ml, 0.707 mmol). The reaction was stirred at 0° C. for 2 hours then diluted with methylene chloride and quenched with saturated NH4Cl and separated. The organic layer was washed with saturated NH4Cl, 6% NaHCO3, dried over Na2SO4, filtered and concentrated in vacuo to provide the desired product (200 mg).
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