吡啶 、
4-(2-fluoro-4-methylanilino)-1-methyl-6-oxo-1,6-dihydro-3-pyridinecarboxylic acid 、
三氟乙酸五氟苯酯 在
crude residue 、 silica gel 、
ethyl acetate n-hexane 作用下,
以
四氢呋喃 为溶剂,
以to give 2,3,4,5,6-pentafluorophenyl 4-(2-fluoro-4-methylanilino)-1-methyl-6-oxo-1,6-dihydro-3-pyridinecarboxylate (90%)的产率得到2,3,4,5,6-pentafluorophenyl 4-(2-fluoro-4-methylanilino)-1-methyl-6-oxo-1,6-dihydro-3-pyridinecarboxylate