An improved process for preparing the antimicrobial compound flumequine is disclosed. The first step of the process comprises reacting 4-fluoroaniline with crotonaldehyde under acidic conditions at a temperature between 50.degree. and 60.degree. C. In the second step, the product of the first step is treated to provide a mixture of 6-fluoroquinaldine and 6-fluorotetrahydroquinaldine. This mixture is then treated with base in the presence of weak acid followed by reducing to provide 6-fluorotetrahydroquinaldine. This compound is then treated according to known procedures to form flumequine.
本发明揭示了一种改进的制备抗微
生物化合物
氟喹诺酮的方法。该方法的第一步包括在50°C至60°C的酸性条件下,将
4-氟苯胺与
巴豆醛反应。在第二步中,第一步的产物被处理成
6-氟喹啉和6-
氟四氢喹啉的混合物。然后,在弱酸存在下,该混合物被碱处理,然后还原以提供6-
氟四氢喹啉。然后,根据已知的程序处理该化合物以形成
氟喹诺酮。