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。