Reactivity of Electron-Deficient Alkynes on Gold Nanoparticles
作者:Antonio Leyva-Pérez、Judit Oliver-Meseguer、Jose R. Cabrero-Antonino、Paula Rubio-Marqués、Pedro Serna、Saud I. Al-Resayes、Avelino Corma
DOI:10.1021/cs400362c
日期:2013.8.2
Propiolates cyclotrimerize in the presence of catalytic amounts of gold nanoparticles to give aryl benzoates in high yields and with turnover frequencies of thousands per hour. Types of alkynes other than propiolates do not react, and, if molecular oxygen is present and dissociated by the gold nanoparticles, electron-rich arenes engage with the propiolate to form a new C-C bond. The activation of propiolates and electron-rich arenes to form C-C bonds, beyond gold-catalyzed Michael additions, constitutes a new example of how and where gold nanoparticles modify the electronic density of unsaturated C-C bonds and opens the door to future transformations.
Gold-Catalyzed Ethynylation of Arenes
作者:Teresa de Haro、Cristina Nevado
DOI:10.1021/ja909726h
日期:2010.2.10
A novel gold-catalyzed ethynylation of aromatic rings with electron-deficient alkynes via gold catalyzed C-H activation of both C(sp)-H and C(sp(2))-H bonds has been developed. This transformation provides aromatic propiolates difficult to prepare by other methods, highlighting the synthetic potential of gold chemistry.