[Cl:1][C:2]1[N:3]([CH2:10][C@:11]([OH:15])([CH3:14])[CH2:12][OH:13])[CH:4]=[C:5]([N+:7]([O-:9])=[O:8])[N:6]=1.[CH3:16][S:17](Cl)(=[O:19])=[O:18].Cl>N1C=CC=CC=1>[Cl:1][C:2]1[N:3]([CH2:10][C@:11]([OH:15])([CH3:14])[CH2:12][O:13][S:17]([CH3:16])(=[O:19])=[O:18])[CH:4]=[C:5]([N+:7]([O-:9])=[O:8])[N:6]=1(R)-2-Chloro-1-(2,3-dihydroxy-2-methylpropyl)-4-nitroimidazole prepared in Example 10 (879 g, 3.73 mol) was dissolved in pyridine (1778 ml) and cooled to 5° C. To this solution, methanesulfonyl chloride (432.7 ml, 5.59 mol) was added dropwise below 15° C., and the resulting mixture was stirred at the same temperature for 1 hour. To the mixture, 6N hydrochloric acid (5500 ml) was added below 30° C., and the resulting mixture was stirred for 40 minutes with cooling on ice-bath. The precipitates were filtered off and washed with water and toluene in this order to afford primary crystals. In addition, the filtrate was extracted with ethyl acetate (5 liters) twice. The organic phase was washed with water, dried over magnesium sulfate, and filtered to afford a solid. The filtrate was concentrated under reduced pressure. To the residue, toluene was added and the precipitates were filtered off to afford a solid. The solids were combined and dried at 60° C. to afford (R)-2-chloro-1-(2-hydroxy-3-methanesulfonyloxy-2-methylpropyl)-4-nitroimidazole (942.6 g, yield 81%) as a white powder.
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