C([C@@H]1COC(=O)N1[C:14]([C@H:16]1[CH2:21][C@H:20]2[C@H:18]([CH2:19]2)[C@@H:17]1[O:22][Si:23]([C:26]([CH3:29])([CH3:28])[CH3:27])([CH3:25])[CH3:24])=[O:15])C1C=CC=CC=1.[OH:30]O.O.[OH-].[Li+]>C1COCC1.O>[Si:23]([O:22][C@@H:17]1[C@@H:16]([C:14]([OH:15])=[O:30])[CH2:21][C@H:20]2[C@@H:18]1[CH2:19]2)([C:26]([CH3:29])([CH3:28])[CH3:27])([CH3:25])[CH3:24]
To a solution of (R)-4-benzyl-3-((1S,2S,3S,5S)-2-(tert-butyldimethylsilyloxy)bicyclo[3.1.0]hexane-3-carbonyl)oxazolidin-2-one (40 g, 96.4 mmol) in THF (200 mL) and water (50 mL) was added 30% aqueous hydrogen peroxide (88 mL, 771 mmol) dropwise at 0° C., followed by the addition of a solution of lithium hydroxide monohydrate (16 g, 386 mmol) in water (100 mL). After stirring for 1 hour at 0° C., the reaction mixture was stirred at room temperature overnight. The excess hydrogen peroxide was completely consumed by the addition of saturated aqueous sodium bisulfate. The mixture was then adjusted to pH=14 with 1 N NaOH and washed with ether (400 mL). The aqueous layer was then acidified to pH=3 with 1 M aqueous potassium hydrogen sulfate, and extracted with ethyl acetate (3×400 mL). The combined organic extracts were washed with brine, dried over sodium sulfate, filtered and concentrated to afford the title compound (22 g, 88%) as a colorless oil.
Loading…
