[NH2:1][C@@H:2]([C@H:5]([CH3:11])[CH2:6][C:7]([F:10])([F:9])[F:8])[CH2:3][OH:4].C(N(CC)CC)C.[Cl:19][C:20]1[S:24][C:23]([S:25](Cl)(=[O:27])=[O:26])=[CH:22][CH:21]=1>C(Cl)Cl.CCOC(C)=O>[Cl:19][C:20]1[S:24][C:23]([S:25]([NH:1][C@H:2]([CH2:3][OH:4])[C@H:5]([CH3:11])[CH2:6][C:7]([F:8])([F:9])[F:10])(=[O:27])=[O:26])=[CH:22][CH:21]=1To (2S,3R)-2-amino-5,5,5-trifluoro-3-methylpentan-1-ol (1.07 g, 6.25 mmol) and triethylamine (0.87 mL, 6.2 mmol) in CH2Cl2 (15 mL) at 0° C. was added dropwise a solution of 5-chlorothiophene-2-sulfonylchloride (1.34 g, 6.25 mmol) in CH2Cl2 (15 mL). The reaction mixture was warmed to 25° C. and stirred for 24 h. It was then diluted with EtOAc (100 mL) and washed with aqueous 0.1 N HCl (50 mL) and brine (50 mL). The aqueous layer was extracted with EtOAc (50 mL). The combined organic extracts were dried using Na2SO4 and concentrated. Flash chromatography (eluent: 3:7 EtOAc-hexane) provided 5-chloro-N-[(1S,2R)-4,4,4-trifluoro-1-(hydroxymethyl)-2-methylbutyl]thiophene-2-sulfonamide (1.66 g, 75%) as a white solid. Recrystallization (EtOAc-heptane, 1:4) provided white needles (1.39 g, 84% recovery), mp 136-137° C.
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