Iridium-Catalyzed Asymmetric Hydrogenation of Racemic β-Keto Lactams via Dynamic Kinetic Resolution
作者:Deng-Hui Bao、Xue-Song Gu、Jian-Hua Xie、Qi-Lin Zhou
DOI:10.1021/acs.orglett.6b03397
日期:2017.1.6
A highly efficient Ir-catalyzed asymmetric hydrogenation of racemic β-keto lactams via dynamic kinetic resolution (DKR) for the synthesis of optically active β-hydroxyl lactams has been described. With the Ir-SpiroSAP catalyst, a series of racemic β-keto lactams including β-keto γ-, δ-, and ε-lactams were hydrogenated to chiral β-hydroxy lactams in high yields (87–99%) with excellent enantio- and
已经描述了通过动态动力学拆分(DKR)的高效Ir催化的外消旋β-酮内酰胺的不对称氢化,用于合成光学活性的β-羟基内酰胺。使用Ir-SpiroSAP催化剂,可将一系列外消旋的β-酮内酰胺(包括β-酮γ-,δ-和ε-内酰胺)以高收率(87-99%)氢化成手性β-羟基内酰胺,同时具有出色的对映体性能。在温和的反应条件下,在低催化剂负载下的非对映选择性(83–99.9%ee,顺/反:97:3–> 99:1)。该有效方法已成功地用于氟喹诺酮类抗生素前马氟沙星的手性中间体的合成。