Water → HCID 178503131, compound

Participants

Reaction Steps

The crude ketone from step 1 (23.9 g) was stirred in 500 mL methanol and 100 mL water with 8 mL hydrazine hydrate at reflux under nitrogen for 24 hour. The mixture was cooled, concentrated, diluted with ethyl acetate, washed successively with 1N HCl and brine, dried over MgSO4 and concentrated in vacuo. Recrystallization from ethyl acetate-hexane gave 4-(4-fluorophenyl)-3-[4-(methylthio)phenyl]-1H-pyrazole as a pale yellow solid (16.9 g, 90.1%). Elemental analysis Calc'd for C16H13 N2FS: C, 67.58, H, 4.61, N, 9.85, S, 11.28. Found: C, 67.44, H, 4.76, N, 9.69, S, 11.27.

Provenance & Evidence