[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([S:8][C:9]2[CH:10]=[C:11]([NH2:15])[CH:12]=[CH:13][CH:14]=2)=[C:4]([N+:16]([O-:18])=[O:17])[CH:3]=1.[C:19](Cl)(=[O:21])[CH3:20]>C(Cl)Cl>[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([S:8][C:9]2[CH:10]=[C:11]([NH:15][C:19](=[O:21])[CH3:20])[CH:12]=[CH:13][CH:14]=2)=[C:4]([N+:16]([O-:18])=[O:17])[CH:3]=1The product from Example 71a (650 mg, 2.50 mmol) was dissolved in DCM and acetyl chloride (196 mg, 2.50 mmol) was added. Allowed to stir at room temperature for 1 h, at which time a solid was collected by filtration providing the title compound (690 mg, 61%)
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