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.
                            2-(4-
硝基苯基)-2-
甲基丙二酸酯是通过 4-
硝基苯基卤化物与
甲基丙二酸酯在碱存在下反应制备的。碱最好是碱
金属氢氧化物或
碳酸钾。产物可还原成相应的 2-(4-
氨基苯基)-2-
甲基丙二酸酯。这两种酯的 3-
氟-4-
硝基苯基和 4-
氨基-3-
氟苯基衍
生物都很新颖。
氨基苯基
丙二酸酯可与苯化合物偶联并进行脱羧反应,得到 2-芳基
丙酸,如
氟比洛芬。另外,4-硝基
苯丙二酸酯脱羧后可进行还原和偶联,同样可得到 2-芳基
丙酸和酯。