Ketoprofen → Dexketoprofen

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

(±)-2-(3-Benzoylphenyl)propionic acid (12.7 g, 50 mmol) was added to tetrahydrofuran (hereinafter abbreviated to "THF") (45 ml) and dissolved. Then, (S)-(+)-3-methyl-2-phenylbutylamine (4.1 g, 25 mmol) was added dropwise with stirring. After completing the addition, the reaction solution was maintained at 35° C. to 40° C. for one hour, stirred at room temperature for 4 hours, and then cooled to 10° C. The crystal precipitated was filtered, and the filter cake was washed with cold THF (35 ml) and then dried to give a diastereomer salt (5.84 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 56% and the optical purity was 94.3% e.e.

Herkunft & Nachweise