作者:Juan A. Faraldos、Robert M. Coates、José-Luis Giner
DOI:10.1021/jo4017056
日期:2013.10.18
involves a 6-endo epoxide ring-opening with ester participation that simultaneously inverts the 3R-configuration of the (3R)-2,3-epoxy-2-fluoroprenyl acetate intermediate and installs the ketone functionality of the semiochemical. Extensive NMR studies validate the proposed 6-endo mechanism of the featured rearrangement, which under anhydrous conditions resulted in the formation of two bicyclic 1,3-dioxan-5-ones
雄性科罗拉多马铃薯甲虫分泌的信息素的简明制剂[即。(3 S )-1,3-二羟基-3,7-二甲基-6-辛烯-2-one]从2-氟橙花醇或2-氟香叶醇开始,分四步完成。合成中的关键步骤涉及酯参与的 6-内环氧化物开环,同时反转(3 R )-2,3-环氧-2-氟异戊二烯乙酸酯中间体的 3 R-构型并安装符号化学。广泛的 NMR 研究验证了所提出的特征重排的 6-endo 机制,该机制在无水条件下通过前所未有的分子内 Prins 环化形成两个双环 1,3-二恶烷-5-酮。