Process for production of fluoroalkoxy-substituted benzamides and their intermediates
申请人:Albemarle Corporation
公开号:US06822114B1
公开(公告)日:2004-11-23
Roflumilast and new key intermediates therefor are prepared by processes involving use of carbonylation technology. Good overall yields can be achieved using available starting materials. The starting material for the process can be catechol, an o-R1-phenol, an o-R1-p-X-phenol, or a 1-X-3-R1-4-R2-benzene, where R1, is a C1-6 alkoxy, C3-7 cycloalkoxy, C3-7 cycloalkylmethoxy, or benzyloxy group, or a C1-4 alkoxy group which is completely or partially substituted by fluorine; R2 is a C1-4 alkoxy group which is completely or partially substituted by fluorine; and X is Cl, Br, or I.
Roflumilast和新的关键中间体是通过使用羰基化技术制备的。使用可用的起始材料可以获得良好的总产率。该过程的起始材料可以是邻苯二酚,o-R1-苯酚,o-R1-p-X-苯酚或1-X-3-R1-4-R2-苯,其中R1是C1-6烷氧基,C3-7环烷氧基,C3-7环烷基甲氧基或苄氧基或完全或部分被氟替代的C1-4烷氧基; R2是完全或部分被氟替代的C1-4烷氧基; X是Cl,Br或I。