The invention relates to a novel preparation of 3-fluoroquinolines of formula (I)
in which R1, R2, R3 and R4 represent:
a) a fluorine;
b) an alkyl optionally substituted with one to three fluorines, with OR5 in which R5 is an alkyl, a hydrogen or a hydroxyl-protecting group, or with NR′R″ in which R′ and R″ represent an alkyl, a hydrogen or an amino-protecting group;
c) OR6 in which R6 represents a hydrogen, a phenol-protecting group or an alkyl, optionally substituted with a fluorine, with OR5 or with NR′R″ as defined above;
d) NR′1R″1 in which R′1 and R″1 have the values of R′ et R″ or represent an alkyl substituted with a fluorine, with OR5 or NR′R″ as defined above;
e) CO2Ra, in which Ra represents hydrogen, alkyl or a carboxyl-protecting group, and also novel intermediate compounds.
The quinolines of formula (I) are intermediates useful in the preparation of compounds having antibacterial activity, described in particular in applications WO 02/40474 or WO 02/72572.
本发明涉及一种
3-氟喹啉的新制备方法,其
化学式为(I),其中R1、R2、R3和R4表示:a)
氟;b)烷基,可选地用一到三个
氟代替,或者用OR5代替,其中R5表示烷基、氢或羟基保护基,或用NR′R″代替,其中R′和R″表示烷基、氢或
氨基保护基;c)OR6,其中R6表示氢、
酚保护基或烷基,可选地用
氟代替,或者用上述定义的OR5或NR′R″代替;d)NR′1R″1,其中R′1和R″1具有R′和R″的值,或表示用
氟代替的烷基,或用上述定义的OR5或NR′R″代替;e)CO2Ra,其中Ra表示氢、烷基或羧基保护基,并且本发明还涉及新的中间体化合物。化合物(I)的
喹啉是有用的中间体,可用于制备具有抗菌活性的化合物,特别是在WO 02/40474或WO 02/72572的申请中描述的化合物。