[NH2:1][C:2]1[N:7]=[C:6]([NH:8][C:9]([O:11][CH3:12])=[O:10])[CH:5]=[C:4]([O:13][S:14]([C:17]2[CH:22]=[CH:21][C:20]([CH3:23])=[CH:19][CH:18]=2)(=[O:16])=[O:15])[N:3]=1.ClC1C=CC=C(C(OO)=[O:32])C=1.CCCCCC>CO.C(Cl)Cl>[NH2:1][C:2]1[N+:7]([O-:32])=[C:6]([NH:8][C:9]([O:11][CH3:12])=[O:10])[CH:5]=[C:4]([O:13][S:14]([C:17]2[CH:22]=[CH:21][C:20]([CH3:23])=[CH:19][CH:18]=2)(=[O:16])=[O:15])[N:3]=120.6 g of methyl 2-amino-6-[(p-tolylsulphonyl)oxy]-4-pyrimidinecarbamate are suspended in 120 ml of methanol and 720 ml of methylene chloride. While stirring there are added thereto at room temperature 20.5 g of m-chloroperbenzoic acid and after 6 hours a further 16.3 g of m-chloroperbenzoic acid. The mixture is stirred overnight and subsequently treated with 1.5 l of hexane, whereby a precipitate separates. The precipitate is filtered off under suction and dried, there being obtained crude methyl 2-amino-6-[(p-tolylsulfonyl)oxy]-4-pyrimidinecarbamate-3-oxide of melting point 139°-142°.
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