C([O-])(O)=O.[Na+].[NH:6]1[CH2:10][CH2:9][CH2:8][CH:7]1[CH2:11][OH:12].[Br:13][C:14]1[CH:19]=[CH:18][C:17]([S:20](Cl)(=[O:22])=[O:21])=[CH:16][CH:15]=1>C(Cl)Cl>[Br:13][C:14]1[CH:19]=[CH:18][C:17]([S:20]([N:6]2[CH2:10][CH2:9][CH2:8][C@@H:7]2[CH2:11][OH:12])(=[O:22])=[O:21])=[CH:16][CH:15]=1To a mixture of sat aq. NaHCO3 (44 g, 0.53 mol), CH2Cl2 (400 mL) and pyrrolidin-2-yl-methanol (53 g, 0.53 mol) was added a solution of 4-bromo-benzenesulfonyl chloride (127 g, 0.50 mol) in CH2Cl2 (100 mL). The reaction was stirred at 20° C. overnight. The organic phase was separated and dried over Na2SO4. Evaporation of the solvent under reduced pressure provided (R)-(1-(4-bromophenylsulfonyl)pyrrolidin-2-yl)methanol (145 g, crude), which was used in the next step without further purification. 1H NMR (CDCl3, 300 MHz) δ 7.66-7.73 (m, 4H), 3.59-3.71 (m, 3H), 3.43-3.51 (m, 1H), 3.18-3.26 (m, 1H), 1.680-1.88 (m, 3H), 1.45-1.53 (m, 1H).
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