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Methanesulfonyl chloride (4.0 mL, 51.6 mmol) was added into a solution of [5-bromo-2-(2-methylpiperidin-1-yl)phenyl]methanol (13.43 g, 47.3 mmol) and DIEA (17.7 mL, 104 mmol) in anhydrous DCM (130 mL) cooled at 0° C. After 1 hour, the reaction mixture was diluted with MeOH (150 mL) and heated at 50° C. for 3 hours. The solvents were removed under reduced pressure to give a brown oil. The residue was taken up with Et2O (450 mL), and then washed with water (150 mL, pH 8 adjusted with a 5N aqueous solution of NaOH), saturated aqueous solution of NH4Cl (2×150 mL) and brine (150 mL). The aqueous layers were extracted with Et2O (150 mL). The combined organic layers were dried (MgSO4) and the solvent was removed under reduced pressure to give the title compound as a brown yellow oil (13.0 g, 92%) used without further purification in the next step. HPLC (Method A), Rt 2.9 min (Purity: 97.1%). HPLC/MS, M+(ESI): 298.1, 300.1. 1H NMR (CDCl3, 300 MHz) δ 7.59 (d, J=2.5 Hz, 1H), 7.36 (dd, J=8.5, 2.5 Hz, 1H), 7.03 (d, J=8.5 Hz, 1H), 4.60 (d, J=12.8 Hz, 1H), 4.52 (d, J=12.8 Hz, 1H), 3.44 (s, 3H), 2.96-2.81 (m, 2H), 2.51 (m, 1H), 1.77 (m, 2H), 1.64 (m, 2H), 1.50-1.30 (m, 2H), 0.79 (d, J=6.1 Hz, 3H).

1. temperatureheated at 50° C. for 3 hours
2. customThe solvents were removed under reduced pressure
3. customto give a brown oil
4. washwashed with water (150 mL, pH 8
5. extractionThe aqueous layers were extracted with Et2O (150 mL)
6. dry with materialThe combined organic layers were dried (MgSO4)
7. customthe solvent was removed under reduced pressure