[CH3:1][S:2][C:3]1[N:8]=[C:7]([NH:9][C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=2)[C:6]([C:16]([O:18]CC)=[O:17])=[CH:5][N:4]=1.[OH-].[Li+]>C(O)C>[NH:9]([C:7]1[C:6]([C:16]([OH:18])=[O:17])=[CH:5][N:4]=[C:3]([S:2][CH3:1])[N:8]=1)[C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1A solution of ethyl 2-(methylthio)-4-(phenylamino)pyrimidine-5-carboxylate (4.0 g, prepared according to the reported preparation in Barvian, M.; et al. J. Med. Chem. 2000, 43, 4606) in ethanol (50 mL) was treated with 2 N lithium hydroxide (50 mL) at room temperature for 16 hours. The reaction mixture was washed with ether and then brought to pH 6 via the addition of 1 N hydrochloric acid. The resulting precipitate was collected by filtration, azeotroped with toluene and dried under vacuum to obtain the title compound (2.2 g) having the following physical data.
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