Acetonitrile → ethyl 1-(2-chloro-5-fluoropyrimidin-4-yl)-3-methyl-1H-pyrazole-4-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a solution of ethyl 3-methyl-1H-pyrrole-4-carboxylate (3.15 g, 20.5 mmol) in acetonitrile (MeCN) were added potassium carbonate (5.7 g, 41 mmol) and 2,4-dichloro-5-fluoropyrimidine (3.4 g, 20.5 mmol) at room temperature. The resulting slurry was heated at 80° C. for 3 hours with monitoring a reaction with LC-MS or thin layer chromatography (TLC). It was diluted with ethyl acetate and washed with brine. The collected organic layer was dried over anhydrous sodium sulfate and then partially concentrated in vacuo. To this, n-hexanes were added to form pale yellow precipitates. The resulting solids were collected by filtration and rinsed with n-hexanes and then dried under high vacuum to give 4.9 g (85%) of the target intermediate 3; MS (ESI) m/z 285 [M+H]+

Provenance & Evidence