Phenylhydrazine → HCID 58072432, compound

Participants

Reaction Steps

To a solution of ethyl trifluoroacetate (0.139 mL, 1.17 mmol) in methyl tert-butyl ether (1 mL) was added NaOMe (28% in MeOH, 245 mg, 1.27 mmol) at room temperature. To the mixture was added a solution of 3-acetyl-1-[3-(trifluoromethyl)phenyl]pyridazin-4(1H)-one (300 mg, 1.06 mmol) in THF (1.5 mL) and methyl tert-butyl ether (1.5 mL) at room temperature. The mixture was stirred at room temperature for 2 days. The mixture was diluted with 1 M HCl aqueous solution, extracted with AcOEt, washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. To the residue were added phenylhydrazine (0.209 mL, 2.12 mmol) and AcOH (3.5 mL). The mixture was heated to reflux for 90 min. The mixture was diluted with 1 M HCl aqueous solution, extracted with AcOEt, washed with NaHCO3 aqueous solution, dried over MgSO4, filtered, concentrated in vacuo, purified by column chromatography on silica gel (hexane/AcOEt=50/50 to 0/100), crystallized with AcOEt/hexane and purified by HPLC to yield the title compound (9.6 mg, 2% yield) as a white solid: mp 190-191° C. 1H NMR (DMSO-d6, 300 MHz): δ ppm 6.73 (1H, d, J=7.9 Hz), 7.37-7.81 (10H, m), 8.97 (1H, d, J=8.3 Hz). Anal. Calcd for C21H12F6N4O: C, 56.01; H, 2.69; N, 12.44. Found: C, 55.70; H, 2.81; N, 12.23.

Provenance & Evidence