Trifluoroacetic acid → HCID 18980914, compound

Participants

Reaction Steps

To 74 g (149 mmole) of N-(4-trifluoromethylphenyl)-3-(4-chlorophenyl)-4-carbo-t-butoxyamino-4-methyl-4,5-dihydro-1H-pyrazole-1-carboxamide (Example 2) was added 74 g of trifluoroacetic acid and 74 g of chloroform. The mixture was refluxed for 40 minutes while gas was evolved and then an additional 20 minutes. The mixture was then concentrated in vacuo and then partitioned between ethyl ether and dilute aqueous sodium hydroxide. The organic layer was washed with brine, dried over magnesium sulfate, concentrated in vacuo, and the resulting solid was triturated with hexanes and filtered yielding 50 g (85%) of a white solid, mp 165°-167° C.

Provenance & Evidence