[CH3:1][S:2][CH2:3][CH2:4][NH:5][C:6](=[O:12])[O:7][C:8]([CH3:11])([CH3:10])[CH3:9].C1C=C(Cl)C=C(C(OO)=[O:21])C=1.[OH2:24].C(=O)(O)[O-].[Na+]>O1CCCC1.C(OCC)(=O)C>[CH3:1][S:2]([CH2:3][CH2:4][NH:5][C:6](=[O:12])[O:7][C:8]([CH3:9])([CH3:11])[CH3:10])(=[O:21])=[O:24]
In a dried reaction flask, the crude tert-butyl 2-(methylthio)ethylcarbamate (2.464 g, about 11.0 mmol) was dissolved in tetrahydrofuran (22 mL). To the mixture was added 77% mCPBA (5.698 g, 25.42 mmol) in portion at 0° C. The mixture was stirred for 1 hr. Water, saturated aqueous sodium bicarbonate solution and ethyl acetate were added. The mixture was extracted with ethyl acetate. The combined organic phase was washed with saturated salt water, dried over anhydrous sodium sulfate, and was purified by silica gel column chromatography with ethyl acetate to obtain a white solid (0.95 g) in 38.7% yield.
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