通过二酯前体的快速真空热解 (FVP) 在气相中生成束缚的双-2,5-二亚甲基-2,5-二氢呋喃。这些基于呋喃的双(对醌二甲烷)显示出发生导致大环的反应。观察到的产物强烈支持涉及环状双自由基中间体的机制。通过高级 ab initio 计算研究了呋喃基对醌二甲烷的形成和相应的环化化学。理论研究揭示了熵驱动消除步骤在高温 FVP 化学中的重要性。
An Expedient Route for the Stereoselective Construction of Bridged Polyheterocyclic Ring Systems Using the Tandem “Pincer” Diels−Alder Reaction
作者:Mark Lautens、Eric Fillion
DOI:10.1021/jo9701593
日期:1997.6.1
The tandem "pincer" Diels-Alder reaction, consisting of two consecutive [4 + 2] cycloadditions between two dienes and an acetylenic bis-dienophile, has been applied toward the rapid construction of bridged polyoxacyclic ring systems when furan derivatives are used as the diene components. The study has demonstrated the stereoselectivity (exo-exo adduct), the chemoselectivity ("pincer" vs "domino")
Synthesis and ethylene-promoted metathesis of adducts of tandem [4+2]/[4+2] cycloaddition between bis-furyl dienes and maleic acid derivatives
作者:Elizaveta A. Kvyatkovskaya、Polina P. Epifanova、Eugeniya V. Nikitina、Aleksey A. Senin、Victor N. Khrustalev、Kirill B. Polyanskii、Fedor I. Zubkov
DOI:10.1039/d0nj04528d
日期:——
During this work, a series of 1,4:5,8-diepoxynaphthalenes, annellated with various carbo- and heterocycles, was synthesized based on the tandem intermolecular/intramolecular [4+2] cycloaddition of bis-furyl dienes with moderately to highly reactive cyclic dienophiles (maleic anhydride and maleinimides). The stereochemistry of the resulting adducts was established using 2D NMR and X-ray structural analysis