A NEW PROCESS FOR PREPARING A QUINOLONE-CARBOXYLIC ACID

摘要

The invention provides a process for preparing a quinolone-carboxylic acid derivatives of formula (I), wherein: R1is H, halogen, NH2; R2is halogen; R3is H, halogen, C1-C4alkoxy, CN; R4is C3-C6cycloalkyl, C1-C4alkyl, C1-C4alkoxyC1-C4alkyl, C1-C4alkylaminoC1-C4alkyl. The invention also provides a new intermediate of acetophenone of formula (II).