Enantioselective Hydroboration of Styrenes with Markovnikov Selectivity Catalyzed by a Rhodium(I)-NHC Complex
作者:Kartick Dey、Zeqing Chen、Natalia Fridman、Graham de Ruiter
DOI:10.1021/acs.organomet.4c00002
日期:2024.4.22
developing field where N-heterocyclic carbenes (NHCs) are making increasingly more impact. Herein, we report the synthesis and characterization of carbene-oxazoline containing proligands that exhibit two chiral centers. The corresponding rhodium(I) complexes show excellent activity toward the asymmetric hydroboration of styrenes, which occurs with good regio– and enantioselectivity (up to 96% ee). The
无膦配体的不对称催化是一个快速发展的领域,其中 N-杂环卡宾 (NHC) 的影响力越来越大。在此,我们报告了含有具有两个手性中心的卡宾-恶唑啉配体的合成和表征。相应的铑(I)配合物对苯乙烯的不对称硼氢化反应表现出优异的活性,并且具有良好的区域选择性和对映选择性(高达 96% ee)。随后氧化所得硼酸酯,并以中等至良好的收率(高达 75%)分离出相应的手性醇。总体而言,硼氢化反应在环境条件下(CH 2 Cl 2;25 °C)发生,与各种官能团相容,并且可以轻松地从相应的烯烃获得手性仲醇。