4,5-diphenyltetrahydro-3h-pyrazol-3-one → HCID 9912069, compound

Participants

Reaction Steps

4,5-Diphenyl-3-pyrazolidinone (3.00 g, 12.6 mmol) was dissolved in 40 mL THF under nitrogen, then a solution of 4-chloro-3-trifluoromethylphenylisocyanate (2.87 g, 13.0 mmol, 1.03 eq.) in 10 mL THF added over 2 min. After 2.3 hr, solvent was removed in vacuo, and the residue triturated with 25 mL toluene. The resulting solid was pulverized, washed twice with toluene, and dried in vacuo at 65° C. to give 4.94 g (85%) white solid.

Provenance & Evidence