Asymmetric Reductive Amination with Pinacolborane Catalyzed by Chiral SPINOL Borophosphates
作者:Zhenwei Wu、Hualing He、Minglei Chen、Linfei Zhu、Weitao Zheng、Yang Cao、Jon C. Antilla
DOI:10.1021/acs.orglett.2c03866
日期:2022.12.30
The catalyticasymmetric reductive amination of ketones with pinacolborane employing chiral SPINOL-derived borophosphates as catalysts has been realized. A series of chiral amine derivatives bearing multiple functional groups were obtained in good to excellent yields and enantioselectivities (up to 97% yield, 98% ee) under mild reaction conditions. Moreover, the synthetic applicability of the established
使用手性 SPINOL 衍生的硼磷酸盐作为催化剂,酮与频哪醇硼烷的催化不对称还原胺化反应已经实现。在温和的反应条件下,获得了一系列具有多个官能团的手性胺衍生物,具有良好至优异的产率和对映选择性(高达 97% 产率,98% ee)。此外,该方法的合成适用性已通过 ( R )-Fendiline 的不对称合成得到证明。
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.
Cooperative Catalysis: Combining an Achiral Metal Catalyst with a Chiral Brønsted Acid Enables Highly Enantioselective Hydrogenation of Imines
作者:Weijun Tang、Steven Johnston、Chaoqun Li、Jonathan A. Iggo、John Bacsa、Jianliang Xiao
DOI:10.1002/chem.201302437
日期:2013.10.11
Asymmetric hydrogenation of imines leads directly to chiral amines, one of the most important structural units in chemical products, from pharmaceuticals to materials. However, highly effective catalysts are rare. This article reveals that combining an achiral pentamethylcyclopentadienyl (Cp*)–iridium complex with a chiral phosphoric acid affords a catalyst that allows for highly enantioselective hydrogenation