ethyl 7-(4-ethoxycarbonylpiperazin-1-yl)-1-(2-hydroxyethyl)-4-oxo-1,6-naphthyridine-3-carboxylate 在
氯化亚砜 作用下,
以
氯仿 为溶剂,
以78%的产率得到1-(2-Chloro-ethyl)-7-(4-ethoxycarbonyl-piperazin-1-yl)-4-oxo-1,4-dihydro-[1,6]naphthyridine-3-carboxylic acid ethyl ester