(4R,4aS,12bS)-4a-hydroxy-9-methoxy-3-methyl-2,4,7a,13-tetrahydro-1H-4,12-methanobenzofuro[3,2-e]isoquinolin-7-one → Oxycodone

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Reaction Steps

14-Hydroxycodeinone (4.98 g) and acetic acid (155 g) were added to a Parr shaker equipped with hydrogen inlet and outlet connectors. The mixture was shaken for about 5 minutes to completely dissolve the 14-hydroxycodeinone at ambient temperature. The system was then evacuated and the Parr shaker was filled with nitrogen. In one portion, under the nitrogen atmosphere, 10% Pd/C (50% water wet, 4.0 g) was added. The system was then evacuated, and was filled with hydrogen gas to a pressure of about 38 psi. The hydrogen inlet from the supply tank was then closed and the mixture was shaken at an initial pressure of 38 psi for about 3 hours (at ambient temperature). After 3 hours of shaking, the system was evacuated and filled with nitrogen. The contents were filtered over a hyflo-supercel filtering pad (3 g, wetted with water). The Parr bottle and wet cake were then rinsed with acetic acid (2×21 g). The filtrate was concentrated in vacuo to dryness at temperature NMT 50° C. The residue was then dissolved with de-ionized water (50 g), and the pH adjusted to about 11.0 to 12.0 using 20% aqueous KOH solution and concentrated ammonium hydroxide (4 g). The mixture was then extracted with ethyl acetate (4×135 g), and the combined organic layers concentrated in vacuo to dryness. A yield of 3.51 to 4.26 g of crude oxycodone with HPLC purity of over 85A % (70.0 to 85.0% yield) was obtained.

Provenance & Evidence