Trifluoroacetic acid → HCID 66657212, compound

Participants

Reaction Steps

To a toluene solution (4 ml) containing 3(S)-[4-(pyridin-2-yloxy)butylamino]pyrrolidine-1-carboxylic acid tert-butyl ester (0.2 g, 0.6 mmol) and 4-bromo-2-chloro-1-fluorobenzene (0.8 ml, 0.65 mmol) were added tri-tert-butylphosphine tetrafluoroborate (14 mg, 0.05 mmol), tris(dibenzylideneacetone)dipalladium (11 mg, 0.012 mmol) and sodium tert-butoxide (110 mg, 1.2 mmol) and heated under reflux under a nitrogen atmosphere for 12 hours. After cooling to room temperature, water was added to the reaction solution, and extraction with ethyl acetate was conducted. The extract was dried over magnesium sulfate and concentrated under reduced pressure, and the residue was then purified by silica gel column chromatography (n-hexane:ethyl acetate=3:1). The solvent was distilled off from the purified product under reduced pressure. The residue was dissolved in 0.4 ml dichloromethane, and trifluoroacetic acid (0.06 ml, 0.8 mmol) was added thereto, followed by stirring at room temperature for 3 hours. After concentrating under reduced pressure, the residue was purified by HPLC. After collecting objective fractions, the solvent was distilled off under reduced pressure, and 10% aqueous potassium carbonate solution was added to the residue, followed by extraction with dichloromethane. The extract was dried over magnesium sulfate and concentrated under reduced pressure, and an ethanol solution containing fumaric acid (8.1 mg) was added to the residue (ethanol solution) to thereby obtain a uniform solution. After concentration under reduced pressure, water (3 ml) was added to the residue, followed by freeze-drying to thereby obtain 19 mg of white solid (3-chloro-4-fluorophenyl)-[4-(pyridin-2-yloxy)butyl]-(S)-pyrrolidin-3-ylamine difumarate.

Provenance & Evidence