cyclophanes have received increasing attention for drug discovery due to their unique properties arising from the conformational strain. However, the catalytic asymmetric synthesis of planar-chiral cyclophanes is one of the long-standing challenges in chemistry. We herein report a Brønsted acid-catalyzed asymmetric transfer hydrogenation (ATH) reaction of cyclophane-derived imines, providing the planar-chiral
平面手性环烷由于其构象应变产生的独特性质而在药物发现中受到越来越多的关注。然而,平面手性环芳烷的催化不对称合成是
化学领域长期面临的挑战之一。我们在此报道了环芳衍生
亚胺的布朗斯台德酸催化不对称转移氢化(ATH)反应,以良好的产率(高达 98%)和高对映选择性(高达 >99% ee)提供平面手性环芳。可变的 ansa 桥允许 ATH 反应通过动力学拆分或动态动力学拆分过程发生。带有适当苯环取代基的[11]–[14]环
芳烃经历KR过程,而[15]–[17]环
芳烃以DKR方式经历ATH反应。进行对照实验以了解反应机理和对映选择性的起源。