[CH3:1][O:2][C:3](=[O:15])[C@H:4]([CH2:13]O)[NH:5][C:6]([O:8][C:9]([CH3:12])([CH3:11])[CH3:10])=[O:7].C(NC(C)C)(C)C.CS(Cl)(=O)=O.[C:28]1([SH:34])[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=1>ClCCl>[C:9]([O:8][C:6]([NH:5][C@H:4]([C:3]([O:2][CH3:1])=[O:15])[CH2:13][S:34][C:28]1[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=1)=[O:7])([CH3:12])([CH3:11])[CH3:10]A 0° C. solution of N-(tert-butoxycarbonyl)-L-serine methyl ester (30 g, 137 mmol) and diisopropylamine (58 mL, 330 mmol) in dichloromethane (250 mL) was treated with methanesulfonyl chloride (11.65 mL, 151 mmol), stirred for 20 minutes, treated with thiophenol (15.5 mL, 151 mmol), warmed to room temperature, stirred for 30 minutes, and concentrated. The concentrate was purified by flash column chromatography on silica gel with 10% ethyl acetate/hexanes to provide the desired product. MS (ESI(−)) m/e 310 (M−H)−.
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