申请人:Ihara Chemical Industry Co., Ltd.
公开号:US06162944A1
公开(公告)日:2000-12-19
Process for production of, from inexpensive raw materials of high commercial availability, N-cyclopropylanilines which are an important intermediate in producing a quinolonecarboxylic acid having a cyclopropyl group at the 1-position, a fluorine atom at the 6-position, and an alkyl group, an alkoxy group or a fluorine-substituted methoxy group at the 8-position (this quinolonecarboxylic acid is a useful synthetic antibacterial agent); and intermediates therefor. For example, a process for producing an N-cyclopropyl-3,4-difluoroaniline represented by the formula (4): ##STR1## includes reacting, in the presence of an acid in an alcohol type solvent, a 3,4-difluoro-2-substituted-aniline with a 1-alkoxy-1-trialkylsilyloxycyclopropane to produce an N-alkoxycyclopropylaniline represented by the general formula (3): ##STR2## and then reducing the N-alkoxycyclopropylaniline.
生产N-环丙基苯胺的过程,使用价格便宜且商业上易获得的原材料,该化合物是合成喹诺酮羧酸的重要中间体,其在1-位置带有环丙基基团,在6-位置带有氟原子,在8-位置带有烷基、烷氧基或氟取代的甲氧基基团(该喹诺酮羧酸是一种有用的合成抗菌剂);以及相关中间体。例如,生产由下式(4)表示的N-环丙基-3,4-二氟苯胺的过程包括在醇类溶剂中存在酸的情况下,将3,4-二氟-2-取代苯胺与1-烷氧基-1-三烷基硅氧基环丙烷反应,以产生由通式(3)表示的N-烷氧基环丙基苯胺,然后还原N-烷氧基环丙基苯胺。