6,7-dichloro-1-ethyl-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid 、
N-羟乙基哌嗪 在
乙醇 、
乙二醇甲醚 作用下,
以
二甲基亚砜 为溶剂,
反应 3.33h,
以3.5 g of 6-chloro-1-ethyl-7-[4-(β-hydroxyethyl)-piperazinyl]-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid, m.p. 215° C., were obtained的产率得到6-chloro-1-ethyl-7-[4-(2-hydroxy-ethyl)-piperazin-1-yl]-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid