[O:1]([C:8]1[N:13]=[CH:12][C:11]([C:14](=[O:16])[CH3:15])=[CH:10][N:9]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[C:17](OCC)(=[O:23])[C:18]([O:20][CH2:21][CH3:22])=[O:19].C[O-].[Na+].CO>C(OCC)C>[O:23]=[C:17]([CH2:15][C:14](=[O:16])[C:11]1[CH:12]=[N:13][C:8]([O:1][C:2]2[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=2)=[N:9][CH:10]=1)[C:18]([O:20][CH2:21][CH3:22])=[O:19]A mixture consisting of 1-(2-phenoxypyrimidin-5-yl)ethanone (Example 38, Step B, 214 mg, 1.00 mmol) and diethyl oxalate (0.14 mL, 150 mg, 1.0 mmol) in diethyl ether (10 mL) under a nitrogen atmosphere at room temperature was stirred for ten minutes. Sodium methoxide (65 mg, 1.2 mmol) was subsequently added followed by methanol (1.0 mL). The solution was stirred overnight at room temperature. The off-white precipitate which had formed was collected by filtration and washed with diethyl ether. The solid was dissolved in water and the pH adjusted to 3 using acetic acid. The solid precipitate which formed was filtered and washed with water. The solid was air dried to afford a mixture comprising both the ethyl and methyl esters.
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