Transition-Metal-Free Synthesis of Electron Rich 1,3-Dienes via Base Promoted Isomerization of Propargylic Ethers
作者:Chunxiang Liu、Guogang Deng、Xin Li、Yiren Xu、Kaili Yu、Wen Chen、Hongbin Zhang、Xiaodong Yang
DOI:10.1002/ejoc.201901743
日期:2020.1.31
An efficient and broadly applicable method for the construction of functionalized electron rich 1,3‐dienes through a base promoted isomerization reaction of propargylic ethers is presented. This process features easy handling reaction conditions, transition‐metal‐free isomerization, high isolated yields, and most of all, it could be used for late stage modification of natural products.
immobilization on graphite felt for solid-phase acetylenecouplingreaction was achieved by electrochemical polymerization of the substrate precursor containing a pyrrole side chain, where the amount of substrate on the electrode surface was easily controlled by the number of repeated cyclic voltammetric scannings. Couplings between terminal acetylenes and the iodobenzene-modified graphite felt electrode
On the regiochemistry of Mitsunobu alkylations of hydrazine derivatives
作者:Damian G. Dunford、Faryal Chaudhry、Benson Kariuki、David W. Knight、Robert C. Wheeler
DOI:10.1016/j.tetlet.2012.10.084
日期:2012.12
That differentially protected hydrazines of the type TsNHNHCOR3 undergo regiospecific Mitsunobu reactions with a variety of alcohols, R1R2CHOH in a generalised manner, to give good to excellent yields of the mono-adducts Ts(R1R2CH)NNHCOR3, has been proven by X-ray crystallographic analysis.
TsNHNHCOR 3类型的受不同保护的肼与多种醇R 1 R 2 CHOH以广义方式进行区域特异性的Mitsunobu反应,以使单加合物Ts(R 1 R 2 CH)NNHCOR 3的收率达到良好至极佳的水平,已通过X射线晶体学分析证明。
Pyrazine- and pyridine-substituted prop-2-yn-1-ols, but-3-yn-2-ols, and but-3-yn-2-ones – purification, stability, and handling revised
作者:Claudia Schindler、Carola Schulzke
DOI:10.1007/s10593-016-1811-0
日期:2015.11
A short series of alkynyl-substituted pyrazine and pyridine derivatives was synthesized by the palladium-catalyzed Sonogashiracross-couplingreactions between arylhalides and alkynes. All the products are either white solids or colorless liquids, which is partly in contrast to previous reports. After purification, a color change or intense darkening was observed, in some cases starting almost immediately