[OH:1][CH:2]1[CH2:7][CH2:6][N:5]([C:8]2[CH:18]=[CH:17][C:11]([C:12]([O:14][CH2:15][CH3:16])=[O:13])=[CH:10][CH:9]=2)[CH2:4][CH2:3]1.CCN(CC)CC.[CH3:26][S:27](Cl)(=[O:29])=[O:28]>C(Cl)Cl>[CH3:26][S:27]([O:1][CH:2]1[CH2:7][CH2:6][N:5]([C:8]2[CH:18]=[CH:17][C:11]([C:12]([O:14][CH2:15][CH3:16])=[O:13])=[CH:10][CH:9]=2)[CH2:4][CH2:3]1)(=[O:29])=[O:28]To a solution of ethyl 4-(4-hydroxypiperidin-1-yl)benzoate (8.0 g, 32.1 mmol) in CH2Cl2 (200 mL) was added Et3N (23 mL, 165 mmol) under nitrogen, followed by MsCl (5.6 g, 48.9 mmol). The mixture was stirred for 5 minutes, washed with water (300 mL), dried over anhydrous MgSO4, filtered, and concentrated to afford ethyl 4-(4-(methylsulfonyloxy)piperidin-1-yl)benzoate as a tan solid (10.5 g, 100%).
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