Control with an iron hand: A broad range of ketimines underwent enantioselectivehydrogenation in the presence of a chiralBrønsted catalyst and a well‐defined nonchiral iron catalyst (see scheme). This procedure constitutes an attractive and environmentally favorable alternative to well‐established asymmetric hydrogenation reactions with precious‐metal catalysts.
stereoselectivity. The applicability of the solid-supported catalyst of choice to the reduction of different imines was also demonstrated. Additionally, for the first time, a catalytic reactor containing a polymer-immobilized chiral picolinamide has been employed for the stereoselectivereduction of imines with trichlorosilane under continuous flow conditions.
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