Process for preparing therapeutic 2-arylpropionic acids and esters, and novel arylmethylmalonate esters
申请人:THE UPJOHN COMPANY
公开号:EP0032620A1
公开(公告)日:1981-07-29
2-(4-Nitrophenyl)-2-methylmalonate esters are prepared by reacting 4-nitrophenyl halides with methylmalonate esters in the presence of a base. The base is preferably an alkali metal hydroxide or potassium carbonate. The products can be reduced to the corresponding 2-(4-aminophenyl)-2-methylmalonate esters. The 3-fluoro-4-nitrophenyl and 4-amino-3-fluorophenyl deriviatives of both types of esters are novel.
The aminophenylmalonate esters may be coupled with a benzene compound and decarboxylated to give 2-arylpropionic acids such as flurbiprofen. Alternatively, decarboxylation of the 4-nitrophenylmalonate ester may be followed by reduction and coupling, again to give 2-arylpropionic acids and esters.