[F:1][C:2]1[C:7]([C:8]([F:11])([F:10])[F:9])=[CH:6][CH:5]=[CH:4][C:3]=1[CH2:12][C:13]([OH:15])=O.C(Cl)(=O)C(Cl)=O.[NH2:22][C:23](=[N:29]O)[C:24]([O:26][CH2:27][CH3:28])=[O:25].C(N(CC)C(C)C)(C)C>ClCCl.N1C=CC=CC=1.CN(C=O)C>[F:1][C:2]1[C:7]([C:8]([F:9])([F:10])[F:11])=[CH:6][CH:5]=[CH:4][C:3]=1[CH2:12][C:13]1[O:15][N:29]=[C:23]([C:24]([O:26][CH2:27][CH3:28])=[O:25])[N:22]=1
This compound was prepared according to general method 2 with (step I) 2-(2-fluoro-3-(trifluoromethyl)phenyl)acetic acid (0.420 g; 1.89 mmol) and oxalyl chloride (0.176 mL; 2.08 mmol) in dichloromethane (12 mL) with few drops of DMF and (step II) ethyl 2-amino-2-(hydroxyimino)acetate (0.250 g; 1.89 mmol) and N,N diisopropylethylamine (0.527 mL; 3.03 mmol) in dichloromethane (10 mL) and (step III) pyridine (18 mL). The crude material was purified by flash chromatography on silica (eluent 20 to 100% ethyl acetate in heptane) to yield 0.085 g (14%) of ethyl 5-(2-fluoro-3-(trifluoromethyl)benzyl)-1,2,4-oxadiazole-3-carboxylate as a white solid.
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