[Na].[CH3:2][O-:3].[Na+].F[B-](F)(F)F.CO[N+:12]1[N:13]([C:18]2[CH:23]=[CH:22][C:21]([C:24]([F:27])([F:26])[F:25])=[CH:20][CH:19]=2)[N:14]=[C:15]([CH3:17])[CH:16]=1>CO.O>[CH3:2][O:3][C:16]1[C:15]([CH3:17])=[N:14][N:13]([C:18]2[CH:19]=[CH:20][C:21]([C:24]([F:25])([F:26])[F:27])=[CH:22][CH:23]=2)[N:12]=1
Sodium metal (0.25 g, 11.0 mmol) was stirred at 23° C. in methanol (10 mL) until a clear solution was obtained. This sodium methoxide solution was added to crude 1-methoxy-4-methyl-2-[4-(trifluoromethyl)phenyl]-2H-1,2,3-triazolium tetrafluoroborate (1:1) (i.e. the product of Step B, 1.1 g, 3.2 mmol). The reaction mixture was stirred at 23° C. for 6 h, during which time a white precipitate formed. The reaction mixture was diluted with water (20 mL) and extracted with ethyl acetate (40 mL, 10 mL). The organic layer was dried (MgSO4) and concentrated under reduced pressure. The crude residue was purified by chromatography on silica gel eluting with 0 to 10% ethyl acetate in hexanes to afford the title compound (0.82 g) as a colorless solid.
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