Water → 4-(4-fluorophenyl)-3-[4-(methylthio)phenyl]-5-(trifluoromethyl)-1H-pyrazole

Participants

Reaction Steps

Crude 2-(4-fluorophenyl)-1-[4-(methylthio)phenyl]-4,4,4-trifluoro-1,3-butanedione (Example 3, Step 2) (1.0 g) was reacted with anhydrous hydrazine (0.13 g) in glacial acetic acid. The mixture was held at 80°-110° C. for 18 hours and poured into water. The resulting solid precipitate was filtered, purified by HPLC and recrystallized from methylene chloride-hexane to give 4-(4-fluorophenyl)-3-[4-(methylthio)phenyl]-5-(trifluoromethyl)-1H-pyrazole as a solid (0.88 g, 89%): mp 189°-190° C.

Provenance & Evidence