Gold-Catalyzed Oxidative Coupling of Alkynes toward the Synthesis of Cyclic Conjugated Diynes
作者:Xiaohan Ye、Haihui Peng、Chiyu Wei、Teng Yuan、Lukasz Wojtas、Xiaodong Shi
DOI:10.1016/j.chempr.2018.07.004
日期:2018.8
developed as an efficient approach for the synthesis of challenging cyclic conjugated diynes (CCD). Compared with the classic copper-promoted oxidative coupling reaction of alkynes, this gold-catalyzed process exhibited a faster reaction rate due to rapid reductive elimination from the Au(III) intermediate. This unique reactivity thus allowed a challenging diyne macrocyclization to take place with high
Investigation of an Efficient Palladium-Catalyzed C(sp)−C(sp) Cross-Coupling Reaction Using Phosphine−Olefin Ligand: Application and Mechanistic Aspects
作者:Wei Shi、Yingdong Luo、Xiancai Luo、Lei Chao、Heng Zhang、Jian Wang、Aiwen Lei
DOI:10.1021/ja8049436
日期:2008.11.5
A pi-acceptor phosphine-electron-deficient olefin ligand was found effective in promoting Pd-catalyzed C(sp)-C(sp) cross-coupling reactions. The new protocol realized the cross-coupling of a broad scope of terminal alkynes and haloalkynes in good to excellent yields with high selectivities. Electron-rich alkynes, which are normally difficult substrates in Glaser couplings, could be employed as either
Nickel-Catalyzed Oxidative Coupling Reactions of Two Different Terminal Alkynes Using O<sub>2</sub> as the Oxidant at Room Temperature: Facile Syntheses of Unsymmetric 1,3-Diynes
作者:Weiyan Yin、Chuan He、Mao Chen、Heng Zhang、Aiwen Lei
DOI:10.1021/ol8027863
日期:2009.2.5
Two different terminal alkynes now can be coupled together in the presence of NiCl2·6H2O/CuI by using an excess of one of the terminal alkyne substrates. The new method employed 20 mol % TMEDA as the ligand and environmentally benign O2 or air as the oxidant. It is the first example using Ni-salt as catalyst by employing air or O2 as oxidant, which led to efficient heterocoupling of two different alkynes
现在,可以通过使用过量的一种末端炔烃基质在NiCl 2 ·6H 2 O / CuI存在下将两个不同的末端炔烃偶联在一起。该新方法采用20 mol%的TMEDA作为配体,并采用对环境无害的O 2或空气作为氧化剂。这是第一个使用镍盐作为催化剂,通过使用空气或O 2作为氧化剂的例子,这导致了两个不同炔烃的有效异质偶联。
Copper Nanoparticles on Ordered Mesoporous Carbon Nitride Support: a Superior Catalyst for Homo- and Cross-Coupling of Terminal Alkynes under Base-Free Conditions
作者:Hang Xu、Liangying Wu、Jing Tian、Jun Wang、Peng Wang、Xiyu Niu、Xiaoquan Yao
DOI:10.1002/ejoc.201901296
日期:2019.10.24
A novel heterogeneous catalyst (Cu NPs‐OMCN) was synthesized and utilized as a highly efficient catalyst for homo‐ and cross‐coupling of terminalalkynesunder base‐free conditions in ethanol. Various symmetrical and unsymmetrical 1,3‐diynes were obtained with good to excellent yields. Furthermore, the heterogeneous catalyst could be recovered and reused for several times with satisfactory yields.