[C:1]([O:4][CH2:5][C:6]1[N:11]=[C:10]([C:12]([F:15])([F:14])[F:13])[N:9]=[C:8]([C:16]([O:18]CC)=[O:17])[CH:7]=1)(=[O:3])[CH3:2].O.[OH-].[Li+]>O1CCCC1.O>[C:1]([O:4][CH2:5][C:6]1[N:11]=[C:10]([C:12]([F:13])([F:15])[F:14])[N:9]=[C:8]([C:16]([OH:18])=[O:17])[CH:7]=1)(=[O:3])[CH3:2]A solution of ethyl 6-[(acetyloxy)methyl]-2-(trifluoromethyl)pyrimidine-4-carboxylate (0.95 g, 3.2 mmol, from Step B) in tetrahydrofuran (8.7 mL) at 0° C. was treated with Lithium hydroxide, monohydrate (140 mg, 3.2 mmol) in water (1.3 mL). The reaction was stirred for 15 minutes, then was treated with 1N HCl to pH˜4 while still in the ice bath. THF was removed from the mixture in vacuo. The product was extracted first with ethyl acetate, then with several portions of 10% isopropanol in CHCl3, including periodic adjustment of pH as necessary. The extracts were combined and dried over sodium sulfate, filtered and concentrated to afford a yellow oil, which was used without further purification.
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