Sodium Hydroxide → 4-[1-(2-Trimethylsilanylethanesulfonyl)piperidin-4-yloxy]benzonitrile

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Step-3: To a stirred solution of 9.84 g (0.049 mol) of 2-trimethylsilanylethanesulfonyl chloride (SESCl) in DCM (100 mL) cooled to −78° C., was added the step-2 product, 4-(piperidin-4-yloxy)benzonitrile hydrochloride, (9.00 g, 0.038 mol). The mixture was stirred 30 min, warmed to −30° C., and stirred 3 h. To this mixture was added 20 mL of 1N NaOH solution added, and the DCM and aqueous layers partitioned. The aqueous layer was back extracted with DCM (50 mL) and the combined organic layers washed with brine (50 mL), saturated aqueous NaHCO3 (2×30 mL), dried (MgSO4) and concentrated in vacuo. The crude product was repeatedly crystallized from the minimum amount of DCM in hexanes to get the step-3 product, 4-[1-(2-trimethylsilanylethanesulfonyl)piperidin-4-yloxy]benzonitrile, compound B, as a white solid. (12.95 g, 94%): LCMS [MH+] 367, Rt 3.53; 1H NMR (300 MHz, (CD3)2CO-d6) δ 0.80 (s, 9H), 0.97-1.02 (m, 2H), 1.79-1.88 (m, 2H), 2.04-2.15 (m, 2H), 3.28-3.36 (m, 2H), 3.52-3.60 (m, 2H), 4.79 (septet, J=3.9 Hz, 1H), 7.16 (d, J=9.0 Hz, 2H), 7.70 (d, J=9.0 Hz, 2H).

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