Ir-Catalyzed Enantioselective Hydrogenation of 2<i>H</i>-1,4-Benzoxazines with a Chiral 1,2,3,4-Tetrahydro-1-naphthylamine Derived Phosphine-aminophosphine Ligand
作者:Juan Hu、Daoyong Wang、Zhuo Zheng、Xiangping Hu
DOI:10.1002/cjoc.201200944
日期:2012.11
Unsymmetrical hybrid chiral phosphine‐aminophosphine ligandderived from 1,2,3,4‐tetrahydro‐1‐naphthylamine has been found to be highly efficient in the Ir‐catalyzed asymmetric hydrogenation of various 3‐aryl‐2H‐1,4‐benzoxazines, providing good enantioselectivities (up to 95% ee) and high catalytic activity (S/C up to 5000).
已发现衍生自1,2,3,4-四氢-1-萘胺的不对称杂化手性膦-氨基膦配体在各种3-芳基-2 H -1,4-苯并恶嗪的Ir催化不对称氢化中非常有效,提供良好的对映选择性(高达95%ee)和高催化活性(S / C高达5000)。
Asymmetric Transfer Hydrogenation of Heterocyclic Compounds in Continuous Flow Using an Immobilized Chiral Phosphoric Acid as the Catalyst
作者:Pavel Nagorny、Oleksii Zhelavskyi、Yin-Jia Jhang
DOI:10.1055/a-2085-5256
日期:2023.8
This manuscript describes transfer hydrogenation of bicyclic nitrogen-containing heterocycliccompoundsusing the immobilized chiral phosphoric acid catalyst (R)-PS-AdTRIP in batch and continuous flow. A significant improvement in enantioselectivities is achieved in continuous flow with a fluidized bed reactor packed with (R)-PS-AdTRIP when the flow rate is increased from 0.2 mL/min to 2.0–2.5 mL/min
该手稿描述了使用固定化手性磷酸催化剂 ( R )-PS-AdTRIP 以间歇和连续流进行双环含氮杂环化合物的转移氢化。当流速从 0.2 mL/min 增加到 2.0–2.5 mL/min 时,使用填充 ( R )-PS-AdTRIP的流化床反应器在连续流动中实现了对映选择性的显着改善。优化的连续流动条件始终比使用 2 mol% ( R )-PS-AdTRIP 的间歇转移氢化提供高 4–6% ee 的选择性,并用于使用相同的流化床反应器生成多种手性产物。