Structurally selective stereospecific cyclization of E,E,E,E-geranylfarnesol and its acetate by fluorosulfonic acid
作者:P. F. Vlad、N. D. Ungur、Nguyen Van Hung
DOI:10.1007/bf00633409
日期:1988.9
We have shown previously for the case of sesquiand diterpenes that fluorosulfonic acid is an effective cyclizing agent, ensuring the structurally selective stereospecific occurrence of the reaction [i, 2]. It appeared of interest to investigate the interaction of fluorosulfonic acid with E,E,E,E-geranylfarnesol (I) and its acetate (II), since, in the first place; the cyclization of acyclic sesterterpenoids
我们之前已经在倍半和二萜的情况下表明,氟磺酸是一种有效的环化剂,可确保反应发生结构选择性立体有择性 [i, 2]。研究氟磺酸与 E,E,E,E-香叶基法呢醇 (I) 及其乙酸酯 (II) 的相互作用似乎很有趣,因为首先;无环二萜类化合物的环化作用根本没有被研究过,其次,反应的结果应该是形成了四环烃系统,通过脂肪族化合物的环化作用还无法获得令人满意的产率没有将以特定方式排列的其他结构片段引入后者的分子,从而稳定反应过程中产生的碳正离子 [3]。