Double Arylation of Diynes and Alkynylation of Functionalized Heteroaryl Halides by a Practical Heck Reaction in an Ionic Liquid
作者:Jean-Cyrille Hierso、Samer Saleh、Michel Picquet、Philippe Meunier
DOI:10.1055/s-0031-1289861
日期:2011.12
The efficient palladium-catalyzed alkynylation of electron-rich bromoheteroarenes, incorporating deactivating electron-donating methyl and methoxy groups, and the (hetero)arylation of diynes, take place in the imidazolium ionic liquid [BMIM][BF4], as a highly polar non-volatile solvent. This method may constitute a sustainable alternative to classical solvents such as dioxane, DMF, NMP, or DMAc. New enynes are formed in the presence of a system encompassing a copper-free palladium catalyst, triphenylphosphine as ligand, and various inexpensive bases. The enyne molecules reported are selectively synthesized in high yields and are mostly unprecedented.
在咪唑离子液体[BMIM][BF4]这种高极性非挥发性溶剂中,可以高效地催化富电子溴杂环戊烯的炔化反应,以及二炔(杂)芳基化反应。这种方法可以替代二恶烷、DMF、NMP 或 DMAc 等传统溶剂。新的炔烃是在一个包含无铜钯催化剂、三苯基膦配体和各种廉价碱的体系中形成的。报告中的炔分子是以高产率选择性合成的,而且大多是前所未有的。