[OH:1][CH2:2][C@H:3]1[CH2:7][O:6][C:5](=[O:8])[N:4]1[CH2:9][CH2:10][S:11][C:12]1[S:13][CH:14]=[C:15]([C:17]([O:19][CH2:20][CH3:21])=[O:18])[N:16]=1.C(OCC)(=O)C.C(N(CC)CC)C.Cl>CS(C)=O>[CH:2]([C@H:3]1[CH2:7][O:6][C:5](=[O:8])[N:4]1[CH2:9][CH2:10][S:11][C:12]1[S:13][CH:14]=[C:15]([C:17]([O:19][CH2:20][CH3:21])=[O:18])[N:16]=1)=[O:1]To a solution of the compound 4 (338 mg) in dimethylsulfoxide (3.40 mL)/ethyl acetate (6.80 mL) were added triethylamine (1.00 mL) and sulfur trioxide-pyridine complex (650 mg) at 10° C. and the solution was stirred at room temperature for 1 hour. To the reaction solution was added 1N hydrochloric acid and the solution was extracted with ethyl acetate. The organic layer was washed water and brine, dried over anhydrous sodium sulfate and concentrated to give the title compound (336 mg) having the following physical data. The compound was used in the next reaction without purification.
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