[CH2:1]([O:4][C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][C:6]=1[C:11]1[NH:12][C:13](=[O:20])[C:14]([N:18]=O)=[C:15]([NH2:17])[N:16]=1)[CH:2]=[CH2:3].C(N(CC)CC)C.S(S([O-])=O)([O-])=O.[Na+].[Na+].C(O)(=O)C>O>[CH2:1]([O:4][C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][C:6]=1[C:11]1[NH:12][C:13](=[O:20])[C:14]([NH2:18])=[C:15]([NH2:17])[N:16]=1)[CH:2]=[CH2:3]2-(2-Allyloxyphenyl)-4-amino-5-nitrosopyrimid-6-one (6.3 g.) was suspended in a solution of triethylamine (15 ml.) in water (250 ml.). Sodium dithionite (12 g.) was added in portions with stirring at room temperature. The temperature of the mixture was then raised to 60° C., and it was stirred at this temperature for a further 20 minutes. The pH of the mixture was adjusted to 7 by the addition of glacial acetic acid, and the mixture cooled in ice/water. The solid was filtered off and washed with water to give 2-(2-allyloxyphenyl)-4,5-diaminopyrimid-6-one (5.1 g.), m.p. 127°-130° C.
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