The main tasks of the present invention are to provide, from a raw material which is industrially inexpensive and easy to procure, an N-cyclopropyl-2-difluoromethoxy-3-halogenoaniline which is an important intermediate in production of a quinolonecarboxylic acid having a cyclopropyl group at the 1-position, an isoindolinyl group at the 7-position and a difluoromethoxy group at the 8-position, useful as a synthetic antibacterial agent; and an intermediate used for production thereof.
The present invention provides:
a difluoromethoxybenzene derivative represented by the following formula (1):
wherein X is a halogen atom and Y is a nitro group or an amino group;
an N-(1-alkoxycyclopropyl)-2-difluoromethoxy-3-halogenoaniline derivative represented by the following formula (2):
wherein X is a halogen atom and R1 is a lower alkyl group; and
an N-cyclopropyl-2-difluoromethoxy-3-halogeno-aniline derivative represented by the following formula (3):
wherein X is a halogen atom and R is a hydrogen atom or a 2,2-di(alkoxycarbonyl)ethylene group represented by the following formula (4):
―CH=C(CO 2R2)2 (4)
(wherein R2 is a lower alkyl group).
本发明的主要任务是利用一种工业上廉价和易于获得的原料,提供一种N-环丙基-2-二
氟甲氧基-3-卤代
苯胺,它是生产1-位有环丙基、7-位有
异吲哚啉基、8-位有二
氟甲氧基的
喹啉羧酸的重要中间体,可用作合成抗菌剂;并提供一种用于生产它的中间体。
本发明提供了
由下式(1)表示的
二氟甲氧基苯衍
生物:
其中 X 是卤素原子,Y 是硝基或
氨基;
N-(1-烷氧基环丙基)-2-二
氟甲氧基-3-卤代
苯胺衍
生物,由下式(2)表示: 其中 X 是卤原子,Y 是硝基或
氨基:
其中 X 为卤素原子,R1 为低级烷基;以及
下式(3)所代表的 N-环丙基-2-二
氟甲氧基-3-卤代
苯胺衍
生物:
其中 X 是卤素原子,R 是氢原子或下式(4)代表的 2,2-二(烷氧羰基)
乙烯基:
-CH=C(CO 2R2)2 (4)
(其中 R2 为低级烷基)。