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.
Copper(i)-catalyzed synthesis of 1,3-enynes via coupling between vinyl halides and alkynes or domino coupling of vinyl halides
作者:Yan Zhu、Tingyi Li、Xiaoming Qu、Peng Sun、Hailong Yang、Jincheng Mao
DOI:10.1039/c1ob06210g
日期:——
1,3-Enynes were easily prepared from coupling between vinylhalides and alkynes or domino coupling of vinylhalides in the presence of copper iodide. It is noteworthy that the double-bond geometry of the vinylhalides was retained during the reaction. This ligand-free protocol is potentially useful and practical.
Copper(I) Hydroxyapatite Catalyzed Sonogashira Reaction of Alkynes with Styrenyl Bromides. Reaction of <i>cis</i>-Styrenyl Bromides Forming Unsymmetric Diynes
作者:Debasree Saha、Tanmay Chatterjee、Manabendra Mukherjee、Brindaban C. Ranu
DOI:10.1021/jo3015819
日期:2012.10.19
terminal alkynes and styrenyl bromides has been achieved under the catalysis of hydroxyapatite-supported copper(I). The trans-styrenyl bromides produce the usual trans-enyne products, whereas the cis-styrenyl bromides lead to unsymmetric 1,3-diynes by the cross coupling of terminal alkyne and the alkyne generated from the cis-styrenyl bromide. A series of trans-enynes and unsymmetric 1,3-diynes have been synthesized
An efficient procedure for regio- and stereoselective synthesis of a series of conjugated enynes by a simple Pd-catalyzed cross-coupling reaction of unactivated ethylenes and ethynyl bromide has been developed. The reaction proceeds smoothly in DMF to give the corresponding products in good to excellent yields. The protocol can tolerate a broad range of functional groups on the substrates. (C) 2011 Elsevier Ltd. All rights reserved.
Copper-Catalyzed Aerobic Oxidative Transformation of Ketone-Derived<i>N</i>-Tosyl Hydrazones: An Entry to Alkynes
A novel strategy involving Cu‐catalyzedoxidative transformation of ketone‐derived hydrazone moiety to various synthetic valuable internal alkynes and diynes has been developed. This method features inexpensive metal catalyst, green oxidant, good functional group tolerance, high regioselectivity and readily available starting materials. Oxidative deprotonation reactions were carried out to form internal