Triethylamine → N-(2-Fluoroethyl)-N,1-dimethyl-1H-pyrazole-4-carboxamide

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Reaction Steps

Methyl-1H-pyrazole-4-carboxylic acid (1.0 g, 7.93 mmol) was combined with DMF (10.0 ml) to give a colorless solution. Et3N (3.3 ml, 23.8 mmol) and 2-(1H-benzo[d][1,2,3]triazol-1-yl)-1,1,3,3-tetramethylisouronium tetrafluoroborate (TBTU, 2.8 g, 8.72 mmol) were added and the reaction mixture was stirred at RT for 1 h. 2-Fluoroethyl-methylamine hydrochloride (991 mg, 8.72 mmol) was added and stirring was continued overnight. DMF was removed under HV and the crude product (5.93 g brown oil) was purified by chromatography with a 50 g SiO2—NH2 cartridge (CH2Cl2/MeOH 95:5). The resulting product was dried under HV at RT for 48 h. Yellow oil (1.40 g, 92%); MS: m/z=186.1 [M+H]+.

Provenance & Evidence