Sodium Hydroxide → 3,4-dihydro-6-(3,4-dihydroxyphenyl)-1,3-dimethyl-4-(2,4,6-trimethylphenylimino)-2(1H)-pyrimidinone

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Reaction Steps

A solution of 3,4-dihydro-6-(3,4-dimethoxyphenyl)-1,3-dimethyl-4-(2,4,6-trimethylphenylimino)-2(1H)pyrimidinone (5.0 g) in aqueous hydrobromic acid (47%) (50 ml) was refluxed for 1.5 hours. After being cooled to ambient temperature, the solution was neutralized with aqueous sodium hydroxide, and extracted with chloroform. The organic layer was washed with brine, dried over sodium sulfate, and evaporated. The resulting oil was crystallized from a mixture of diisopropyl ether and ethyl acetate (1:1 v/v) to give 3,4-dihydro-6-(3,4-dihydroxyphenyl)-1,3-dimethyl-4-(2,4,6-trimethylphenylimino)-2(1H)-pyrimidinone (4.41 g).

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