Mander reductive alkylation of methyl 2-methoxybenzoate with prenyl bromide and hydrolysis of the enol ether afforded methyl 6-oxo-1-prenyl-2-cyclohexenecarboxylate. This was converted in five steps (reduction of the ketone, saponification, iodolactonization, ozonolysis, and intramolecular aldol reaction) to a spiro lactone cyclopentenal. An efficient first synthesis of (+/-)-vibralactone was completed
用异
戊烯基
溴对
2-甲氧基苯甲酸甲酯进行还原性烷基化反应和烯醇醚的
水解,得到6-氧代-1-异
戊烯基-2-
环己烯甲酸甲酯。将其分为五个步骤(还原酮,皂化,
碘内酰胺化,
臭氧分解和分子内羟醛反应)转变为
螺内酯环戊烯醛。(+/-)-vibralactone的有效的第一个合成是通过用活化的Zn进行逆
碘内酯化,β-内酯的形成(vibralactone C)和醛的还原而完成的。除了
碘代内酯用于保护
异戊二烯基双键和
羧酸的新用途外,未使用任何保护基。