作者:Yanzhao Wang、Yuanyuan Liu、Kun Li、Guoqiang Yang、Wanbin Zhang
DOI:10.1002/adsc.201700175
日期:2017.6.6
ruthenocene-based phosphine-oxazoline ligand tBu-mono-RuPHOX or the diphosphine ligand BINAP, were developed for the asymmetric hydrogenation of 5,6-dihydropyrazin-2(1H)-ones, affording chiral piperazin-2-ones in good yields and with moderate to good ees. Different catalytic behaviors for the hydrogenation of these types of substrate were observed with these two catalyst systems. Our tBu-mono-RuPHOX ligand, which
从基于钌茂茂的膦-恶唑啉配体t Bu-mono-RuPHOX或二膦配体BINAP生成的两种不同的铱催化剂体系用于5,6-二氢吡嗪-2(1 H)-的不对称氢化,得到手性哌嗪-2-酮,收率高,ee中等至良好。用这两种催化剂体系观察到用于这些类型的底物氢化的不同催化行为。我们的t Bu-mono-RuPHOX配体带有带有手性的钌茂茂骨架,被发现是[Ir(L)(COD)] BArF催化剂体系的最佳配体,可提供所需的产物,ee最高可达94%。