Cyclization of Gold Acetylides: Synthesis of Vinyl Sulfonates via Gold Vinylidene Complexes
作者:Janina Bucher、Thomas Wurm、Kumara Swamy Nalivela、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/anie.201310280
日期:2014.4.7
Differently substituted terminal alkynes that bear sulfonate leaving groups at an appropriate distance were converted in the presence of a propynyl gold(I) precatalyst. After initial formation of a gold acetylide, a cyclization takes place at the β‐carbon atom of this species. Mechanistic studies support a mechanism that is related to that of dual gold‐catalyzed reactions, but for the new substrates
在丙炔基金(I)预催化剂的存在下,将具有适当距离的磺酸盐离去基团的不同取代的末端炔烃进行了转化。乙炔化金最初形成后,在该物种的β-碳原子上发生环化。机理研究支持一种与双重金催化反应相关的机制,但对于新的底物,仅需一个金原子即可激活底物。形成亚乙烯基金络合物后,它与磺酸盐的离去基团形成紧密的接触离子对,这两个部分的重组产生了乙烯基磺酸盐,这是有价值的目标,可以用作例如交叉偶联反应的前体。