Enantioselective synthesis of tunable chiral pyridine–aminophosphine ligands and their applications in asymmetric hydrogenation
作者:Youran Liu、Fei Chen、Yan-Mei He、Chenghao Li、Qing-Hua Fan
DOI:10.1039/c9ob00770a
日期:——
ligands were enantioselectively synthesized based on chiral 2-(pyridin-2-yl)-substituted 1,2,3,4-tetrahydroquinoline scaffolds, which were obtained in high yields and with excellent enantioselectivities via ruthenium-catalyzed asymmetric hydrogenation of 2-(pyridin-2-yl)quinolines. The protocol features a wide substrate scope and mild reaction conditions, enabling scalable synthesis. These chiral
基于手性2-(吡啶-2-基)-取代的1,2,3,4-四氢喹啉骨架,对映选择性地合成了一个可调谐的手性吡啶-氨基膦配体的小型文库,该文库以高收率和优异的对映选择性通过钌催化的2-(吡啶-2-基)喹啉不对称氢化。该方案具有广泛的底物范围和温和的反应条件,可实现可扩展的合成。这些手性P,N配体已成功应用于Ir催化的基准烯烃和具有挑战性的七元环亚胺(包括苯并ze庚因和苯并二氮杂卓)的不对称加氢反应。在2,4-二芳基-3 H-苯并[ b ]氮杂和2,4-不对称氢化反应中,具有出色的对映和非对映选择性(高达99%ee和> 20:1 dr)和/或前所未有的化学选择性。二芳基-3 H-苯并[ b ] [1,4]二氮杂pine。