Dissymmetrically Substituted Diphosphines with Two Atropisomeric Axes and Their Application in Asymmetric Hydrogenation of Imines
作者:Gaspard Hedouin、Racha Abed Ali Abdine、Quentin Dherbassy、Christophe Michon、Ignacio Funes‐Ardoiz、Françoise Colobert、Joanna Wencel‐Delord
DOI:10.1002/adsc.202300527
日期:2023.6.20
diphosphine ligands used in asymmetric catalysis are C2-symmetric and their structural modifications are often limited. Herein, we reported the design of original enantiopure dissymmetrical diphosphines, BiaxPhos, bearing two atropisomeric axes. Their original chiral architecture combined with important modularity, renders BiaxPhos ligands appealing candidates for asymmetric catalysis, as illustrated
尽管具有巨大的潜力和广泛的应用,但用于不对称催化的大多数二膦配体是C 2-对称且它们的结构修饰通常是有限的。在此,我们报道了带有两个阻转异构轴的原始对映纯不对称二膦 BiaxPhos 的设计。其原始的手性结构与重要的模块化相结合,使 BiaxPhos 配体成为不对称催化的有吸引力的候选者,如 Ir-BiaxPhos 催化的不对称亚胺氢化所示,在温和条件下为手性胺提供了优异的对映选择性。值得注意的是,结合实验机理研究和 DFT 计算描绘了尚未探索的机理场景,这意味着烯胺互变异构形式的氢化而不是亚胺的经典还原。