[C:1]([C:5]1[C:10](=[O:11])[CH:9]=[CH:8][N:7]([C:12]2[CH:17]=[CH:16][CH:15]=[C:14]([C:18]([F:21])([F:20])[F:19])[CH:13]=2)[N:6]=1)(=O)[CH2:2][CH3:3].[CH3:22][O-].[Na+].[C:25]1([NH:31][NH2:32])[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1.CO>C(OC)=O.O.Cl>[CH3:3][C:2]1[CH:22]=[N:32][N:31]([C:25]2[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=2)[C:1]=1[C:5]1[C:10](=[O:11])[CH:9]=[CH:8][N:7]([C:12]2[CH:17]=[CH:16][CH:15]=[C:14]([C:18]([F:21])([F:20])[F:19])[CH:13]=2)[N:6]=1
To a suspension of 3-propanoyl-1-[3-(trifluoromethyl)phenyl]pyridazin-4(1H)-one (384 mg, 1.30 mmol) in methyl formate (3.8 mL) was added NaOMe (28% in MeOH, 326 mg, 1.69 mmol) at room temperature. The mixture was stirred at room temperature for 3.5 h. The mixture was diluted with water and 1 M HCl aqueous solution, extracted with AcOEt, washed with brine, dried over Na2SO4, filtered, concentrated in vacuo and crystallized with AcOEt/hexane. To the solid were added phenylhydrazine (0.405 mL, 4.12 mmol) and MeOH (6.7 mL). The mixture was heated to reflux for 15 h. The mixture was diluted with 1 M HCl aqueous solution, extracted with AcOEt, washed with saturated NaHCO3 aqueous solution, dried over Na2SO4, filtered, concentrated in vacuo, purified by column chromatography on silica gel (hexane/AcOEt=50/50 to 0/100) and crystallized with AcOEt/heptane to yield the title compound (161 mg, 39% yield) as a pale yellow solid: mp 208-211° C. 1H NMR (DMSO-d6, 300 MHz): δ ppm 2.09 (3H, s), 6.62 (1H, d, J=8.0 Hz), 7.26-7.35 (3H, m), 7.35-7.44 (2H, m), 7.64-7.85 (5H, m), 8.95 (1H, d, J=8.2 Hz). Anal. Calcd for C21H15F3N4O: C, 63.63; H, 3.81; N, 14.14. Found: C, 63.46; H, 3.92; N, 13.98.
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