5-chloro-2-[2-chloro-4-(trifluoromethyl)phenyl]-4-methoxy-pyridazin-3-one 、
4-chloro-2-[2-chloro-4-(trifluoromethyl)phenyl]-5-methoxy-pyridazin-3-one 、
吗啉 在
氮气 、
乙酸乙酯 、
盐酸 、 Brine 、
magnesium sulfate 作用下,
反应 3.0h,
以to give 5-chloro-2-[2-chloro-4-(trifluoromethyl)phenyl]-4-hydroxy-pyridazin-3-one as a white solid (35 mg) along with its isomer 4-chloro-2-[2-chloro-4-(trifluoromethyl)phenyl]-5-hydroxy-pyridazin-3-one as a white solid (10 mg)的产率得到5-chloro-2-[2-chloro-4-(trifluoromethyl)phenyl]-4-hydroxy-pyridazin-3-one