Optically active benzoxazines and bezothiazines and a process for their stereospecific preparation
申请人:GIST-BROCADES N.V.
公开号:EP0368410A2
公开(公告)日:1990-05-16
Optically active 7,8-difluoro-3,4-dihydro-3-methyl-2H-[1,4]benzoxazines and 7,8-difluoro-3,4-dihydro-2-methyl-2H-[1,4]benzoxazines and the corresponding benzothiazines of formula III,
where, one of the substituents R1, R2, R3 and R4 is CH20H or -CH2Z, the remaining being hydrogen, X denotes fluoro, chloro, methyl or hydrogen, Y is oxygen or sulfur and Z is hydrogen, fluoro or protected hydroxyl are obtained as the stereochemically pure products of a stereospecific synthesis using a 3,4-difluoronitrobenzene substituted with a stereochemically pure 2-(1-hydroxyisopropoxy), 2-(2-hydrox-I ypropoxy), 2-(1-hydroxyisopropylthio) or 2-(2-hydroxypropylthio) substituent.
The obtained compounds are suited for the production of optically active pyridobenzoxazines and pyridobenzothiazines, among which are useful antibacterial optically active quinolones, particularly (S)-(-)-ofloxacin.
具有光学活性的 7,8-二氟-3,4-二氢-3-甲基-2H-[1,4]苯并噁嗪和 7,8-二氟-3,4-二氢-2-甲基-2H-[1,4]苯并噁嗪以及相应的式 III 的苯并噻嗪、
其中,取代基 R1、R2、R3 和 R4 之一为 CH20H 或 -CH2Z,其余为氢;X 表示氟、氯、甲基或氢;Y 表示氧或硫,Z 表示氢、在使用立体化学纯度为 2-(1-羟基异丙氧基)、2-(2-羟基-I y 丙氧基)、2-(1-羟基异丙硫基)或 2-(2-羟基丙硫基)取代基取代的 3,4-二氟硝基苯进行立体特异性合成时,可获得氟或受保护羟基的立体化学纯度为 3,4-二氟硝基苯的产物。
所得到的化合物适用于生产光学活性吡啶并噁嗪类和吡啶并噻嗪类化合物,其中包括有用的抗菌光学活性喹诺酮类化合物,特别是 (S)-(-)-ofloxacin 。