[I:1][C:2]1[CH:3]=[CH:4][C:5]([NH:8][S:9]([C:12]2[CH:17]=[CH:16][C:15]([CH3:18])=[CH:14][CH:13]=2)(=[O:11])=[O:10])=[N:6][CH:7]=1.[H-].[Na+].Cl[CH2:22][C:23]([NH2:25])=[O:24]>CN(C)C=O>[C:23]([CH2:22][N:6]1[CH:7]=[C:2]([I:1])[CH:3]=[CH:4][CH:5]1[NH:8][S:9]([C:12]1[CH:17]=[CH:16][C:15]([CH3:18])=[CH:14][CH:13]=1)(=[O:11])=[O:10])(=[O:24])[NH2:25]To a solution of the product (1.60 g, 4.27 mmol) from Step A in 8.0 mL of dry N,N-dimethylformamide was added sodium hydride (188 mg of 60 weight % dispersion in mineral oil, 4.44 mmol). After 15 min, the solution was warmed to 60° C. for 10 min, and was then cooled to room temperature. Chloroacetamide (420 mg) was added in one portion, and the solution was then warmed to 100° C. After 2.5 h, the solution was cooled to room temperature and poured into 70 mL of ice-water. The resultant precipitate was collected, washed with water and air-dried overnight. The crude product was subsequently stirred with 20 mL of methanol for several minutes, and the product was collected by filtration to afford the title compound as a white powder. LC/MS 414.9 (M+1-H2O).
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