[CH3:1][S:2](Cl)(=[O:4])=[O:3].[CH3:6][C:7]1[C:8]([N+:15]([O-:17])=[O:16])=[C:9]([CH:12]=[CH:13][CH:14]=1)[CH2:10][OH:11].C(N(CC)CC)C>C(Cl)Cl>[CH3:1][S:2]([O:11][CH2:10][C:9]1[CH:12]=[CH:13][CH:14]=[C:7]([CH3:6])[C:8]=1[N+:15]([O-:17])=[O:16])(=[O:4])=[O:3]At 10-15° C., 27 g (0.23 mol) of methanesulfonyl chloride dissolved in 20 ml of CH2Cl2 is dripped into a mixture of 34 g (0.2 mol) of 3-methyl-2-nitrobenzyl alcohol and 27 g (0.27 mol) of triethylamine in 100 ml of CH2Cl2. The reaction mixture is stirred for 1 hour at room temperature and is then extracted with water. The organic phase is dried over MgSO4 and evaporated down. There is obtained as residue 48 g of the title compound as a yellow oil, containing about 10% of the corresponding benzyl chloride as impurity. The crude product is used for the next reaction without any further purification.
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