[Si]([O:18][CH:19]1[CH2:23][CH2:22][N:21]([C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][C:25]=2[S:30]([NH:33][C:34]2[S:35][CH:36]=[CH:37][N:38]=2)(=[O:32])=[O:31])[C:20]1=[O:39])(C(C)(C)C)(C1C=CC=CC=1)C1C=CC=CC=1.[F-].C([N+](CCCC)(CCCC)CCCC)CCC.O>C1COCC1>[OH:18][CH:19]1[CH2:23][CH2:22][N:21]([C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][C:25]=2[S:30]([NH:33][C:34]2[S:35][CH:36]=[CH:37][N:38]=2)(=[O:31])=[O:32])[C:20]1=[O:39]To a solution of (R)-4-(3-(tert-butyldiphenylsilyloxy)-2-oxopyrrolidin-1-yl-N-(thiazol-2-yl)benzenesulfonamide (5.5 g, 9.53 mmol) in THF (40 mL) under N2, was added a solution of tetrabutyl ammonium fluoride in THF (1M, 40 mL, 38.12 mmol). Upon completion of addition, the mixture was stirred at RT overnight. The reaction mixture was poured into water and extracted with CH2Cl2 (2×50 mL), dried over magnesium sulfate, and concentrated. Purification via silica gel chromatography using 2-10% MeOH in CH2Cl2 gave (R)-4-(3-hydroxy-2-oxopyrrolidin-1-yl-N-(thiazol-2-yl)benzenesulfonamide (2.6 g, 76%). LC/MS (10%-99% CH3CN (0.035% TFA)/H2O (0.05% TFA)), m/z: M+1 obs=340.0; tR=0.54 min.
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