[CH3:1][C:2]1[N:10]=[CH:9][CH:8]=[CH:7][C:3]=1[C:4]([OH:6])=O.C(O)C.C(=O)=O.C([N-]C(C)C)(C)C.[Li+].[F:25][C:26]1[CH:27]=[C:28]([CH:31]=[CH:32][C:33]=1[O:34][C:35]([F:38])([F:37])[F:36])[C:29]#[N:30]>O1CCCC1>[F:25][C:26]1[CH:27]=[C:28]([C:29]2[N:30]=[C:4]([OH:6])[C:3]3[CH:7]=[CH:8][CH:9]=[N:10][C:2]=3[CH:1]=2)[CH:31]=[CH:32][C:33]=1[O:34][C:35]([F:37])([F:38])[F:36]300 mg 2-methyl-nicotinic acid was suspended in 10 mL of tetrahydrofuran, and cooled to −70° C. with a bath of ethanol/dry ice. 3.3 mL lithium diisopropylamide (2.0 M in tetrahydrofuran/n-heptane/ethylbenzene) was added dropwise over 10 min and the mixture was stirred for 1.5 h at 0° C. After this time, it was cooled again to -70° C. and 0.9 g 3-fluoro-4-trifluoromethoxy-benzonitrile (4.1) was added quickly. Then the reaction mixture was stirred for 2 h at −70° C. and then warmed overnight to ambient temperature. The solvent was distilled off, diluted with ethyl acetate, 10 mL phosphate buffer and 5 mL 2N aqueous hydrochloric acid solution (pH 6-7). The formed precipitate was collected and dried. The resulting liquid phase was separated and the water phase extracted twice with ethyl acetate. The organic phase was dried over magnesium sulfate, concentrated and the residue suspended in ether and ethyl acetate. The precipitate was collected, dried and combined with the first precipitate.
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