[CH3:1][N:2]1[C:6]([CH3:7])=[CH:5][N:4]=[C:3]1[C:8]1[CH:13]=[CH:12][C:11]([C:14]([F:17])([F:16])[F:15])=[CH:10][CH:9]=1.C=O.[C:20]([O-])(=[O:22])C.[Na+].[OH-].[Na+]>C(O)(=O)C>[CH3:1][N:2]1[C:6]([CH3:7])=[C:5]([CH2:20][OH:22])[N:4]=[C:3]1[C:8]1[CH:9]=[CH:10][C:11]([C:14]([F:16])([F:17])[F:15])=[CH:12][CH:13]=1
A mixture of 1,5-dimethyl-2-(4-trifluoromethylphenyl)imidazole (0.6 g), aqueous formaldehyde (3.5 ml of 36%), sodium acetate (0.6 g), and acetic acid (0.5 ml) was refluxed for 24 hours. The mixture was cooled, and concentrated sodium hydroxide added until the mixture was just: basic, keeping the temperature at about 10° C. The mixture was extracted with methylene chloride, and solvent removed from the organic layer under reduced pressure. The residue was flash-chromatographed on silica gel, eluting with methylene chloride containing methanol (97/3), to yield 0.4 g of 1,5-dimethyl-4-hydroxymethyl-2-(4-trifluoromethyl-phenyl)imidazole, m.p. 152° C.
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