Synthesis of Flurbiprofen

Ethyl 2-fluoro-4-biphenylacetate, prepared from 4-acetyl-2-fluorobiphenyl via the Willgerodt reaction and subsequent esterification, is treated first with diethyl carbonate and sodium ethoxide, then with dimethyl sulfate to give diethyl 2-(2-fluoro-4-biphenylyl)-2-methyl malonate. Saponification followed by acidification affords the malonic acid, which is decarboxylated at 180 – 200 ?C to yield flurbiprofen.

Application of Flurbiprofen

Flurbiprofen has been used at 150 ~ 300 mg/d in the treatment of rheumatoid arthritis, osteoarthritis, and ankylosing spondylitis. Gastrointestinal disturbances, particularly dyspepsia, are the principal adverse effects.

Trade names

Ansaid (Pharmacia & Upjohn, CIS; Upjohn, Canada, Czech Republic, Poland, USA), Cebutid (Knoll, France), Froben (Kanoldt, Germany; Ebewe, Austria; Boots, Spain, The Netherlands, Portugal), Tulip (Upjohn, Spain).