[Br:1][C:2]1[CH:17]=[CH:16][C:5]2[N:6]=[C:7]([N:9]3[CH2:14][CH2:13][CH2:12][C@H:11]([OH:15])[CH2:10]3)[S:8][C:4]=2[CH:3]=1.ClCCl.C(N(CC)CC)C.[CH3:28][S:29](Cl)(=[O:31])=[O:30]>C(OCC)C>[CH3:28][S:29]([O:15][C@H:11]1[CH2:12][CH2:13][CH2:14][N:9]([C:7]2[S:8][C:4]3[CH:3]=[C:2]([Br:1])[CH:17]=[CH:16][C:5]=3[N:6]=2)[CH2:10]1)(=[O:31])=[O:30]In a 20 mL scintillation vial equipped with a magnetic stirbar was added (S)-1-(6-bromobenzo[d]thiazol-2-yl)piperidin-3-ol (Reference Example 7, 1.15 g, 3.67 mmol). Dichloromethane (10 mL) was then added to the reaction vial to give a solution. To this stirred solution was added 2.5 equivalents of triethylamine (1.279 mL, 9.18 mmol). The reaction vial was capped with a septum and vented to a bubbler. The vial was placed in an ice water bath. To this stirred, 0° C. solution was added dropwise 2.0 equivalents of methanesulfonyl chloride (0.572 mL, 7.34 mmol). The reaction mixture was stirred for 10 minutes at 0° C., then the ice bath was removed and stirring was continued at room temperature overnight. The reaction mixture was washed with water, then dried (MgSO4) and filtered. The filtrate was concentrated under reduced pressure to give an oil that was purified by column chromatography on an Analogix IntelliFlash-280 (Analogix SF10-4g [2 connected in series], 100% dichloromethane). Fractions containing product were combined and concentrated under reduced pressure to give a solid that was treated with diethyl ether. This suspension was filtered to collect (S)-1-(6-bromobenzo[d]thiazol-2-yl)piperidin-3-yl methanesulfonate. 1H NMR (300 MHz, CDCl3) δ ppm 1.68-1.81 (m, 1H), 1.94-2.16 (m, 3H), 3.06 (s, 3H), 3.51-3.68 (m, 2H), 3.85-3.90 (m, 2H), 4.86-4.93 (m, 1H), 7.37-7.39 (m, 2H), 7.69-7.71 (m, 1H); MS (DCI/NH3) m/z 391 (M+H)+.
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