NOVEL THREE- AND ONE-CARBON RING EXPANSION REACTIONS OF A FIVE MEMBERED CARBOCYCLIC COMPOUND
作者:Kazuo Tsuzuki、Hisanobu Hashimoto、Haruhisa Shirahama、Takeshi Matsumoto
DOI:10.1246/cl.1977.1473
日期:1977.12.5
Ethyl 2-oxo-1-(2-oxopropyl)-1-cyclopentanecarboxylate, on treatment with tBuOH-tBuOK at rt (1h), affords unusual ring expansion products ethyl 3,5-dioxo-1-cyclooctanecarboxylate, ethyl 4-acetyl-3-oxo-1-cyclohexanecarboxylate and ethyl 2-acetyl-3-oxo-1-cyclohexanecarboxylate in 19, 40 and 12% yields, respectively.
2-氧代-1-(2-氧代丙基)-1-环戊烷羧酸乙酯在室温下(1小时)用tBuOH-tBuOK处理,得到不寻常的扩环产物3,5-二氧代-1-环辛烷羧酸乙酯,4-乙酰基- 3-氧代-1-环己烷羧酸酯和2-乙酰基-3-氧代-1-环己烷羧酸乙酯的产率分别为19%、40%和12%。