Ketoprofen → Dexketoprofen

Participants

Reaction Steps

That is, (±)-2-(3-benzoylphenyl)propionic acid (12.7 g, 50 mmol) was dissolved in MIBK (76 ml) and (S)-(+)-3-methyl-2-phenylbutylamine (4.9 g, 30 mmol) was added dropwise at 40° C. This reaction solution was stirred at 35° C. to 40° C. for one hour, followed by at room temperature for 5 hours and then at 10° C. to 15° C. for one hour. Then, the crystal precipitated was filtered, and the filter cake was washed with cold MIBK (30 ml) and dried to give a diastereomer salt (8.34 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 80%. Melting point: 129°-131° C. Optical purity: 94.3% e.e.

Provenance & Evidence