Ketoprofen → Dexketoprofen

Participants

Reaction Conditions

Reaction Steps

(±)-2-(3-Benzoylphenyl)propionic acid (12.7 g, 50 mmol) was added to methyl ethyl ketone (hereinafter abbreviated to "MEK") (70 ml) and dissolved with heating. Then, (S)-(+)-3-methyl-2-phenylbutylamine (4.9 g, 30 mmol) was added dropwise with stirring. After completing the addition, the reaction solution was stirred at 35°C. to 40°C. for one hour and then at room temperature for 4 hours, and finally maintained at 10°C. for 3 hours. The crystal precipitated was filtered, and the filter cake was washed with cold MEK (35 ml) and dried to give a diastereomer salt (7.72 g) of (S)-(+)-2-(3-benzoylphenyl) propionic acid with (S)-(+)-3-methyl-2-phenylbutylamine. The yield of the product based on (S)-(+)-2-(3-benzoylphenyl) propionic acid contained in the starting material was 74%.

Provenance & Evidence