[F:1][C:2]([F:17])([F:16])[C:3]1[CH:8]=[CH:7][C:6]([C:9]2[O:10][CH:11]=[C:12]([CH2:14][OH:15])[N:13]=2)=[CH:5][CH:4]=1.C(N(CC)CC)C.[CH3:25][S:26](Cl)(=[O:28])=[O:27].O>O1CCCC1>[CH3:25][S:26]([O:15][CH2:14][C:12]1[N:13]=[C:9]([C:6]2[CH:5]=[CH:4][C:3]([C:2]([F:1])([F:16])[F:17])=[CH:8][CH:7]=2)[O:10][CH:11]=1)(=[O:28])=[O:27]A solution of {2-[4-(trifluoromethyl)phenyl]-1,3-oxazol-4-yl}methan-1-ol (0.19 g, 0.78 mmol) in tetrahydrofuran (15 ml) was cooled to 0° C., and triethylamine (0.33 ml, 2,34 mmol) was added, followed by methanesulfonyl chloride (0.12 ml, 1.56 mmol) dropwise. The mixture was stirred for 1 hour at 0° C., then water was added, and product was extracted with ethyl acetate. The organic layer was dried over sodium sulfate, and solvent removed from the filtrate under reduced pressure, to yield {2-[4-(trifluoromethyl)phenyl]-1,3-oxazol-4-yl}methyl methylsulfonate, the mesyl derivative of a compound of formula (15),
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