4-cyano-5-ethyl-3-iodo-1-methyl-1H-pyrrole-2-carboxylic acid ethyl ester 、
2-[4-(2,4-Difluorophenoxy)phenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane 在
silica gel 、
ethyl acetate n-hexane 作用下,
以to provide the final title compound, 4-cyano-5-ethyl-3-[4-(2,4-difluoro-phenoxy)-phenyl]-1-methyl-1H-pyrole-2-carboxylic acid ethyl ester的产率得到