Josiphos-Type Binaphane Ligands for Iridium-Catalyzed Enantioselective Hydrogenation of 1-Aryl-Substituted Dihydroisoquinolines
作者:Huifang Nie、Yupu Zhu、Xiaomu Hu、Zhao Wei、Lin Yao、Gang Zhou、Pingan Wang、Ru Jiang、Shengyong Zhang
DOI:10.1021/acs.orglett.9b03251
日期:2019.11.1
displayed excellent enantioselectivity and good reactivity in the asymmetric hydrogenation of challenging 1-aryl-substituted dihydroisoquinoline substrates (full conversions, up to >99% ee, 4000 TON). The use of 40% HBr (aqueous solution) as an additive dramatically improved the asymmetric induction of these catalysts. This transformation provided a highly efficient and enantioselective access to chiral
描述了一系列Josiphos型双苯甲醚配体的简便合成方法和有用的应用。这些手性二膦的铱络合物在具有挑战性的1-芳基取代的二氢异喹啉底物的不对称氢化中显示出出色的对映选择性和良好的反应性(完全转化,高达> 99%ee,4000 TON)。使用40%HBr(水溶液)作为添加剂可显着改善这些催化剂的不对称诱导。该转化提供了对手性1-芳基取代的四氢异喹啉的高效和对映选择性的途径,这在天然产物和生物活性分子中非常重要且常见。