Fumaric Acid → (3-fluorophenyl)-(S)-pyrrolidin-3-yl-(4-trifluoromethylphenyl)amine difumarate

Participants

Reaction Steps

To a 1,2-dichloromethane solution (1 ml) containing ((S)-1-benzylpyrrolidin-3-yl)-(3-fluorophenyl)-(4-trifluoromethylphenyl)amine (0.48 g, 1.1 mmol) was added 1-chloroethyl chloroformate (0.82 g, 5.8 mmol). The mixture was stirred at room temperature for 15 hours and heated under reflux for 3 hours. The solvent was distilled off under reduced pressure, and 5 ml methanol was then added to the residue and heated under reflux for 3 hours. After distilling the solvent off under reduced pressure, the residue was then dissolved in dichloromethane and washed with an aqueous saturated sodium hydrogencarbonate solution. After drying over magnesium sulfate, the solvent was distilled off under reduced pressure. The residue was dissolved in ethanol, fumaric acid (128 mg, 1.1 mmol) was then added thereto, giving a uniform solution. The solvent was distilled off under reduced pressure, and the crystals produced by adding dichloromethane to the residue were separated by filtration and dried, giving 0.24 g of light brown powdery (3-fluorophenyl)-(S)-pyrrolidin-3-yl-(4-trifluoromethylphenyl)amine difumarate.

Provenance & Evidence