Cu-Catalyzed Formal Methylative and Hydrogenative Carboxylation of Alkynes with Carbon Dioxide: Efficient Synthesis of α,β-Unsaturated Carboxylic Acids
作者:Masanori Takimoto、Zhaomin Hou
DOI:10.1002/chem.201301456
日期:2013.8.19
by different catalyst systems, such those based on Sc, Zr, and Ni complexes, and the subsequent carboxylation of the resulting alkenylaluminum species with CO2 catalyzed by an N‐heterocyclic carbene (NHC)–copper catalyst have been examined in detail. The regio‐ and stereoselectivity of the overall reaction relied largely on the hydroalumination or methylalumination reactions, which significantly depended
由不同的催化剂体系(例如基于Sc,Zr和Ni络合物的催化剂体系)催化的各种炔烃的顺序加氢铝化或甲基铝化,以及随后的烯基铝物种被CO 2羧化已详细研究了由N-杂环卡宾(NHC)催化的铜催化剂。整个反应的区域选择性和立体选择性在很大程度上取决于加氢铝化或甲基铝化反应,这很大程度上取决于催化剂和炔烃底物。随后的Cu催化的羧化反应继续保留了烯基铝物种的立体构型。所有反应都可以在一个反应罐中进行,以有效地提供具有良好控制构型的各种α,β-不饱和羧酸,这是以前报道的方法难以构建的。该方案具有很高的区域选择性和立体选择性,简单的一锅反应操作以及使用CO 2作为起始原料,因此在实践中可能很有用且具有吸引力。