1'-binaphthalene (Neolephos), which permits the palladium-catalyzed selective carbonylation under mild conditions, providing a general preparation of functionalized 1,3-enynes in good-to-high yields with excellent chemoselectivities. Synthetic applications that showcase the possibilities of this novel methodology include an efficient one-potsynthesis of 4-aryl-4H-pyrans as well as the rapid construction of various
The Co(II)-catalyzed selective C–H alkenylation of picolinamides with 1,3-diynes has been developed. This protocol can be applied to a variety of 1,3-diynes. In addition, both symmetrical and unsymmetrical internal alkynes were well tolerated, affording the corresponding alkenyl arenes. Moreover, control experiments indicated that C–H bond cleavage may be involved in the rate-determining step. Furthermore
Practical Oxidative Homo- and Heterocoupling of Terminal Alkynes Catalyzed by Immobilized Copper in MCM-41
作者:Ruian Xiao、Ruiya Yao、Mingzhong Cai
DOI:10.1002/ejoc.201200359
日期:2012.8
A practicaloxidativehomo- and heterocoupling of terminalalkynes was achieved in CH2Cl2 at 25 °C by using a 3-(2-aminoethylamino)propyl-functionalized MCM-41-immobilized copper(I) complex (MCM-41–2N-CuI, 1 mol-%) as the catalyst, piperidine (0.1 or 3 equiv.) as the base, and air as the environmentally friendly co-oxidant, yielding a variety of symmetrical and unsymmetrical 1,4-disubstituted 1,3-diynes
CuCl-catalyzed green oxidative alkyne homocoupling without palladium, ligands and bases
作者:Kun Yin、Chunju Li、Jian Li、Xueshun Jia
DOI:10.1039/c0gc00413h
日期:——
CuCl-catalyzed green oxidative homocoupling of terminalalkynes produces symmetrical1,4-disubstituted1,3-diynes in good to excellent yields, using air as an environmentally friendly oxidant and the occurrence of water as exclusive byproduct in the whole process, and eliminating the need for ligands, bases, oxidants and expensive palladium catalysts.
Supporting a Cu@In<sub>2</sub>O<sub>3</sub> core–shell structure on N-doped graphitic carbon cuboctahedral cages for efficient photocatalytic homo-coupling of terminal alkynes
作者:Yaya Yuan、Ya-Qun Wang、Guilin Zhuang、Qiuyan Li、Feng-Lei Yang、Xiaojun Wang、Xiguang Han
DOI:10.1039/d1ta08075j
日期:——
N-doped carbon cuboctahedral cage-supported core–shell Cu@In2O3 nanocomposites exhibit highly enhanced photocatalytic performances towards the home-coupling of terminal alkynes.