Compounds of formula (XII), (XX), (XX'),(XXI) and
in which R1 represents fluorinated methoxy, R3 represents hydrogen or amino, R3' represents hydrogen or nitro, R3" represents hydrogen, nitro or amino, X and X' represent halogen and R17 represents a carboxy protecting group, are useful in the preparation of 4-oxoquinoline-3-carboxylic acid derivatives.
式(XII)、(XX)、(XX')、(XXI)和(XXI)化合物
其中 R1 代表
氟化甲氧基,R3 代表氢或
氨基,R3'代表氢或硝基,R3 "代表氢、硝基或
氨基,X 和 X'代表卤素,R17 代表羧基保护基团,可用于制备 4-氧代
喹啉-3-羧酸衍
生物。