A stereoselective total synthesis of rhoiptelol B, a diarylheptanoid isolated from the fruits of Rhoiptelea chiliantha, is described. The tetrahydropyran ring was constructed via an intramolecular allylation methodology.
A convergent total synthesis of (−)-dactylolide is described. Constructing the 2,6-disubstituted exo-methylene THP moiety was achieved by the intramolecular allylation of α-acetoxy ether. The cyclization precursor was prepared from two segments, an alcohol and carboxylic acid derivatives, by esterification followed by reductive acetylation.
Aziridine–allylsilane-mediated synthesis of exocyclic γ-amino olefins and azabicyclo[x.y.1]-systems
作者:David J Lapinsky、Stephen C Bergmeier
DOI:10.1016/s0040-4020(02)00725-1
日期:2002.8
We have shown that connection of C-2 of an allylsilane to a tethered aziridine ring yields exocyclic γ-amino olefins and desilylated azabicyclo[x.2.1]-systems upon cyclization with BF3·OEt2. Furthermore, manipulation of a specific exocyclic γ-amino olefin provided access to an azabicyclo[3.3.1]nonane. This methodology should be useful for the preparation of natural products and pharmacologically active
我们已经表明,在用BF 3 ·OEt 2环化后,烯丙基硅烷的C -2与束缚的氮丙啶环连接会生成环外γ-氨基烯烃和脱甲硅氮杂双环[ x .2.1]-系统。此外,对特定的环外γ-氨基烯烃的操作提供了访问氮杂双环[3.3.1]壬烷的途径。该方法学对于制备包含这些双环杂环系统的天然产物和药理活性剂应该是有用的。
A Convenient and Versatile Preparation of Unsymmetrical Bis-metallic Isobutene Derivatives
作者:Bernard Leroy、Benoît Driesschaert
DOI:10.1055/s-2006-948188
日期:2006.8
Synthetically useful unsymmetrical bis-silyl or silylstannyl isobutene derivatives are conveniently prepared from selenoisobutene 5, a versatile equivalent of the isobutene dianion. Sequential treatment of this selenated compound with n-butyl-lithium and the required chlorosilanes or chlorostannanes leads efficiently to the corresponding functionalized isobutenes.
Dichloro(2,2,2-trifluoroethoxy)oxovanadium(V). A Remarkably Effective Reagent for Promoting One-Electron Oxidative Cyclization and Unsymmetrical Coupling of Silyl Enol Ethers
作者:Kendal Ryter、Tom Livinghouse
DOI:10.1021/ja973585e
日期:1998.3.1
[2-((Trimethylsilyl)methyl)prop-2-enyl]- lithium. A Versatile Reagent for the Synthesis of 2-Substituted Propenylsilanes