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
MCM-41-immobilized Schiff base-pyridine bidentate copper(I) complex as a highly efficient and recyclable catalyst for the Sonogashira reaction
作者:Hong Zhao、Bin Huang、Yichao Wu、Mingzhong Cai
DOI:10.1016/j.jorganchem.2015.07.029
日期:2015.11
base-pyridine bidentate copper(I) complex [MCM-41-Sb,Py–CuI] was conveniently prepared from commercially available and inexpensive 3-aminopropyltriethoxysilane via immobilization on MCM-41, followed by reacting with pyridine-2-carboxaldehyde and copper(I) iodide. It was found that this heterogeneous coppercomplex is a highlyefficientcatalyst for the Sonogashira coupling of arylhalides with terminal alkynes
Recyclable and reusable NiCl<sub>2</sub>(PPh<sub>3</sub>)<sub>2</sub>/CuI/PEG-400/H<sub>2</sub>O system for the sonogashira coupling reaction of aryl iodides with alkynes
作者:Ting Wei、Tingli Zhang、Bin Huang、Yuxin Tuo、Mingzhong Cai
DOI:10.1002/aoc.3394
日期:2015.12
Sonogashira reaction has been developed. In the presence of NiCl2(PPh3)2 and CuI, the coupling reaction of aryl iodides with terminal alkynes was carried out smoothly in a mixture of poly(ethyleneglycol) (PEG‐400) and water at 100°C with K2CO3 as base to afford a variety of arylacetylenes in good to excellent yields. The isolation of the products was readily performed by extraction with petroleum ether, and
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
Photosensitizer-free, visible light-mediated recyclable gold-catalyzed cross-coupling of aryldiazonium salts and alkynyltrimethylsilanes
作者:Jiajia Li、Junmin Chen、Hefeng Zhu、Mingzhong Cai
DOI:10.1039/d3nj02853d
日期:——
temperature to afford diverse arylalkynes in moderate to good yields with high functional group tolerance, including aryl halides incompatible with traditional cross-coupling. This new heterogenizedgold(I) catalyst could be easily recovered through a simple centrifugation process and reused at least nine times without any significant drop in its catalytic efficiency.