m-Chloroperbenzoic acid → 7-(3-Methylsulphonylpropylamino)-4-oxo-2-(2-propoxyphenyl)-3,4-dihydropyrimido[4,5-d]-pyrimidine

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A solution of 7-(3-methylsulphinylpropylamino)-4-oxo-2-(2-propoxyphenyl)-3,4,-dihydropyrimido[4,5-d]-pyrimidine (0.80 g) and m-chloroperoxybenzoic acid (0.40 g) in dichloromethane (50 ml) was stirred at ambient temperature for 24 hours. During this time further m-chloroperoxybenzoic acid (about 200 mg) was added on 2 occasions. The solution was washed with dilute aqueous sodium bicarbonate (3×25 ml) and the combined washings back-extracted with a little dichloromethane. The combined organic layer was washed with water and then brine, dried (magnesium sulphate) and evaporated under reduced pressure to yield a residue. This was recrystallized three times from methanol to yield the title compound, 0.51 g, m.p. 222-3° C.

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