[OH:1][C@@H:2]([C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1)[C:3]([O:5][CH3:6])=[O:4].[S:13](Cl)([CH3:16])(=[O:15])=[O:14].Cl>C(Cl)Cl>[CH3:16][S:13]([O:1][C@@H:2]([C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1)[C:3]([O:5][CH3:6])=[O:4])(=[O:15])=[O:14]To a solution of (S)-methyl 2-hydroxy-2-phenylacetate (20.0 g, 120 mmol) in DCM (240 mL) maintained at 0° C. under N2 flowstream, are added mesylchloride (11.2 mL, 144 mmol) and TEA (20.1 mL, 144 mmol) and the mixture is stirred at RT for 1 hour (UPLC-MS monitoring: complete conversion). The mixture is cooled to 0° C., 0.1N HCl (240 mL) is added and the desired compound is extracted with DCM (2×200 mL). The combined DCM phases are dried over Na2SO4, filtered and evaporated to dryness. The resulting crude is purified by filtration through a silica bed eluting with DCM, obtaining 22.4 g of the title compound as white solid (76% yield).
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