Trifluoroacetic acid → 1-Cyclobutyl-3-(2-fluoro-4-(piperazine-1-carbonyl)phenyl)urea

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Reaction Steps

tert-Butyl 4-(4-(3-cyclobutylureido)-3-fluorobenzoyl)piperazine-1-carboxylate (2.8 g, 66.67 mmol), trifluoracetic acid and dichloromethane were stirred for 20 hours then concentrated under reduced pressure. The residue was taken up in dichloromethane/methanol, loaded on to a strong cation exchange column and washed with dichloromethane/methanol. Elution of the column with 2M ammonia in methanol gave the title compound (1.6 g). MS (ESI) m/z: 321.4 [M+H]+

Provenance & Evidence