Copper(<scp>i</scp>)-catalyzed asymmetric intramolecular C-arylation with ureas as the additives: highly enantioselective formation of spirooxindoles
作者:Haowen Ma、Jiajie Feng、Wei Zhou、Chen Chen、Zhuoji Deng、Fengtao Zhou、Yifan Ouyang、Xinhao Zhang、Qian Cai
DOI:10.1039/d1ob01327k
日期:——
copper-catalyzed asymmetric intramolecular C-arylation reaction with ureas as the co-catalysts. By forming hydrogen bonds with 1,3-dicarbonyl structures, ureas can activate the substrates, stabilize the carbanion intermediates and the products, and fix the syn-configurations of 1,3-dicarbonyl structures. They help enhance the reactivity, prevent side reactions and improve the enantioselectivities.
开发了一种以尿素为助催化剂的铜催化不对称分子内 C-芳基化反应的协同催化策略。通过与 1,3-二羰基结构形成氢键,脲可以活化底物,稳定碳负离子中间体和产物,并固定 1,3-二羰基结构的顺式构型。它们有助于提高反应性、防止副反应并提高对映选择性。