ethyl 8-chlorosulfonyl-1-oxaspiro[4.5]dec-7-ene-7-carboxylate 、
2-氯-4-氟苯胺 在
三乙胺 作用下,
以
乙酸乙酯 为溶剂,
生成 ethyl 8-[N-(2-chloro-4-fluorophenyl)sulfamoyl]-1-oxaspiro[4.5]dec-6-ene-7-carboxylate 、 ethyl 8-[N-(2-chloro-4-fluorophenyl)sulfamoyl]-1-oxaspiro[4.5]dec-6-ene-7-carboxylate