[CH3:1][S:2](Cl)(=[O:4])=[O:3].[Cl:6][C:7]1[N:8]([CH2:15][C:16]([OH:20])([CH3:19])[CH2:17][OH:18])[CH:9]=[C:10]([N+:12]([O-:14])=[O:13])[N:11]=1.Cl>N1C=CC=CC=1>[Cl:6][C:7]1[N:8]([CH2:15][C:16]([OH:20])([CH3:19])[CH2:17][O:18][S:2]([CH3:1])(=[O:4])=[O:3])[CH:9]=[C:10]([N+:12]([O-:14])=[O:13])[N:11]=1Methanesulfonyl chloride (2.01 ml, 25.72 mmol) was added to a solution of 2-chloro-1-(2,3-dihydroxy-2-methylpropyl)-4-nitroimidazole prepared in Example 3 (5.05 g, 21.43 mmol) in pyridine (10 ml) with cooling on ice-bath and the resulting mixture was stirred at room temperature for 1.5 hours. 6N hydrochloric acid was added to the mixture, and the resulting mixture was extracted with ethyl acetate. The organic phase was dried over magnesium sulfate, and then concentrated under reduced pressure to afford 2-chloro-1-(2-hydroxy-3-methanesulfonyloxy-2-methylpropyl)-4-nitroimidazole (6.72 g, quantitative) as a yellow oil.
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