ethyl 4-chloro-7-fluoro-8-(2,3,5-trifluorophenyl)quinoline-3-carboxylate 、
ethyl thietane-3-carboxylate 在
lithium hexamethyldisilazane 作用下,
以
四氢呋喃 为溶剂,
以2.22 g的产率得到ethyl 4-[3-(ethoxycarbonyl)thietan-3-yl]-7-fluoro-8-(2,3,5-trifluorophenyl)quinoline-3-carboxylate