C[O:2][C:3](=O)[C:4]1[CH:9]=[CH:8][CH:7]=[N:6][C:5]=1[C:10]1[CH:15]=[CH:14][C:13]([C:16]([F:19])([F:18])[F:17])=[CH:12][CH:11]=1.O[Li].O.[Li].C(Cl)(=O)C([Cl:28])=O>C(Cl)Cl.CN(C=O)C.O.C1COCC1>[F:17][C:16]([F:19])([F:18])[C:13]1[CH:14]=[CH:15][C:10]([C:5]2[N:6]=[CH:7][CH:8]=[CH:9][C:4]=2[C:3]([Cl:28])=[O:2])=[CH:11][CH:12]=1To a solution of the title B compound, 2-(4-trifluoromethyl-phenyl)-nicotinic acid methyl ester (0.626 g, 2.228 mmol) in 1:1 THF:H2O (10 mL) is added LiOH.H2O (0.187 g, 4.456 mmol). After 3.5 h, the reaction mixture is concentrated to dryness under reduced pressure. To a slurry of the crude lithium salt in methylene chloride (10 mL) is added oxalyl chloride (0.78 mL, 8.91 mmol) followed by a few drops DMF. After stirring 16 h, the reaction mixture is concentrated to dryness under reduced pressure and used as is without purification.
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