Chiral Counteranion-Aided Asymmetric Hydrogenation of Acyclic Imines
摘要:
When combined with a chiral phosphate counteranion, a chiral diamine-ligated Ir(III) catalyst displayed excellent enantioselectivities in the asymmetric hydrogenation of a wide range of acyclic imines, affording chiral amines in up to 99% ee.
Bifunctional Catalysis: Direct Reductive Amination of Aliphatic Ketones with an Iridium-Phosphate Catalyst
作者:Barbara Villa-Marcos、Chaoqun Li、Keith R. Mulholland、Philip J. Hogan、Jianliang Xiao
DOI:10.3390/molecules15042453
日期:——
pathway to these amines is directasymmetric reductive amination (DARA) of prochiral ketones. This paper shows that a wide range of aliphatic ketones can be directly aminated under hydrogenation conditions, affording chiral amines with good to excellent yields and with enantioselectivities up to 96% ee. The catalysis is effected by the cooperative action of a cationic Cp*Ir(III) complex and its phosphate
手性胺是精细化工、医药和农化产品中普遍存在的官能团之一,这些胺最方便、经济和生态友好的合成途径是前手性酮的直接不对称还原胺化(DARA)。这篇论文表明,在氢化条件下可以直接胺化范围广泛的脂肪族酮,从而提供具有良好到极好的产率和高达 96% ee 的对映选择性的手性胺。催化作用受阳离子 Cp*Ir(III) 络合物及其磷酸盐反阴离子的协同作用的影响。
Li, Chaoqun; Villa-Marcos, Barbara; Xiao, Jianliang, Journal of the American Chemical Society, 2009, vol. 131, p. 6967 - 6969
When combined with a chiral phosphate counteranion, a chiral diamine-ligated Ir(III) catalyst displayed excellent enantioselectivities in the asymmetric hydrogenation of a wide range of acyclic imines, affording chiral amines in up to 99% ee.