PROCESS FOR PRODUCING N-CYCLOPROPYLANILINES AND INTERMEDIATES USED THEREFOR
申请人:IHARA CHEMICAL INDUSTRY CO., LTD.
公开号:EP0990639A1
公开(公告)日:2000-04-05
The present invention aims at providing processes for production, from inexpensive raw materials of high commercial availability, of 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.
The present invention provides a process for producing an N-cyclopropyl-3,4-difluoroaniline represented by the general formula (4):
which process comprises reacting, in the presence of an acid in an alcohol type solvent, a 3,4-difluoro-2-substituted-aniline represented by the general formula (1):
with a 1-alkoxy-1-trialkylsilyloxycyclopropane represented by the general formula (2):
to produce an N-alkoxycyclopropylaniline represented by the general formula (3):
and then reducing the N-alkoxycyclopropylaniline.
Process for production of N-cyclopropylanilines and intermediates
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.