Ligand-accelerating low-loading copper-catalyzed effective synthesis of (E)-1,3-enynes by coupling between vinyl halides and alkynes performed in water
作者:Peng Sun、Hong Yan、Linhua Lu、Defu Liu、Guangwei Rong、Jincheng Mao
DOI:10.1016/j.tet.2013.06.063
日期:2013.8
The useful conjugated enynes could be easily prepared via low-loading (0.0001 mol %) copper-catalyzed coupling between vinylhalides and terminal alkynes. It is noteworthy that this reaction could be preformed in water without using any co-solvents and the desired 1,3-enynes could be obtained with good yields. In the catalytic reaction, ligand-acceleration effect was markable.
Metal-Free Electrophilic Phosphination/Cyclization of Alkynes
作者:Yuto Unoh、Koji Hirano、Masahiro Miura
DOI:10.1021/jacs.7b02977
日期:2017.5.3
A metal-free electrophilicphosphination reaction has been developed. Electrophilic phosphorus species generated in situ from secondary phosphine oxides and Tf2O smoothly couple with alkynes possessing pendant nucleophiles to afford the corresponding phosphinated cyclization products in good yield. Preliminary NMR studies show that phosphirenium species may be involved as intermediates of the cyclization
Aromatization of dihydronaphthalenes have been accomplished under mild conditions using an organic photocatalyst. Scope and limitations of the approach have been evaluated along with the reaction mechanism.
Copper-catalyzed endo-type trifluoromethylarylation of alkynes
作者:Jun Xu、Yun-Long Wang、Tian-Jun Gong、Bin Xiao、Yao Fu
DOI:10.1039/c4cc05692b
日期:——
A new copper-catalyzed trifluoromethylarylation reaction of alkynes has been developed. The transformation represents the first example of endo-type carbotrifluoromethylation of unsaturated carbon-carbon bonds and provides efficientaccess to a variety of CF3-substituted dihydronaphthalenes and chromenes.
Formation of C(sp<sup>2</sup>)Boronate Esters by Borylative Cyclization of Alkynes Using BCl<sub>3</sub>
作者:Andrew J. Warner、James R. Lawson、Valerio Fasano、Michael J. Ingleson
DOI:10.1002/anie.201505810
日期:2015.9.14
BCl3 is an inexpensive electrophile which induces the borylativecyclization of a wide range of substituted alkynes to regioselectively form polycycles containing synthetically versatile C(sp2)boronateesters. It proceeds rapidly, with good yields and is compatible with a range of functional groups and substitution patterns. Intermolecular 1,2‐carboboration of alkynes is also achieved usingBCl3 to