Trifluoroacetic anhydride → HCID 21712134, compound

Participants

Reaction Conditions

Reaction Steps

2.6 go 5-chloro-3-fluoro-2-(5-methanesulfonyl-1,4-dimethyl-[1H]-pyrazol-3-yl)-pyridine-1-oxide (Example P40) are introduced into 35 ml of dry dimethylformamide. At a temperature of 10° C., 16.8 g of trifluoroacetic anhydride are added dropwise and the mixture is then stirred overnight at 22° C., subsequently poured into 2 liters of ice-water and extracted with tert-butyl methyl ether. After drying over magnesium sulfate, filtering and concentrating to dryness by evaporation in vacuo, 1.8 g of the desired compound are obtained as crude product, which can be used directly in the next step.

Provenance & Evidence