A study of the arylation of ethyl 4-oxocyclohex-2-enecarboxylate and a number of its derivatives by aryl-lead triacetates has been carried out. Ethyl 2-methyl-4-oxocyclohex-2-enecarboxylate (Hagemann's ester)(7), and ethyl 4-oxocyclohex-2-enecarboxylate (10a) and its double bond isomer (10b) were found to undergo regiospecific arylation at C-1 in good yield, whereas the compounds (14) and (16), which
已经进行了4-
氧代
环己-2-
烯基
羧酸乙酯及其许多衍
生物被芳基-三
乙酸铅芳基化的研究。发现
2-甲基-4-
氧代
环己-2-
烯基
羧酸乙酯(哈格曼
酯)(7)和4-
氧代
环己-2-
烯基
羧酸乙酯(10a)及其双键异构体(10b)在C-1处具有区域特异性芳基化作用具有良好收率的化合物,而具有C-3取代基的化合物(14)和(16),由于在C-1和C-3处均芳基化而产生的产物收率低。后者的行为也通过含有6-
甲基取代基的异构体(20a)和(20b)表现出来。