Method of preparing D-propoxyphene
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United States of America Patent
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May 17, 1994
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app pub date -
Mar 19, 1992
filing date -
May 26, 1989
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Abstract
D-propoxyphene can be prepared by reacting d-oxyphene and propionic anhydride. Preferably, an excess of propionic anhydride is used. The reaction easily proceeds at temperatures of 70.degree. to 80.degree. C. and produces yields exceeding 95 percent of theory. The free base d-propoxyphene can easily be converted in high yields to its hydrochloride or napsylate salts, both analgesics.
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