5-(3,4-bis-benzyloxy-5-nitro-phenyl)-1-methyl-2-(2-trifluoromethyl-1-oxy-pyridin-3-yl)-1H-pyrrole-3-carboxylic acid ethyl ester 在
三溴化硼 、
甲醇 作用下,
以
dichlorometane 为溶剂,
反应 1.5h,
以93%的产率得到5-(3,4-dihydroxy-5-nitrophenyl)-1-methyl-2-(2-trifluoromethyl-1-oxypyridin-3-yl)-1H-pyrrole-3-carboxylic acid ethyl ester