Development of Immobilized Carreira (Phosphoramidite, Olefin) Ligands and Application in Iridium-Catalyzed Asymmetric Allylic Amination
作者:Leijie Zhou、Nicola Zanda、Moreshwar Chaudhari、Mariane Felicio Da Silva、Miquel A. Pericàs
DOI:10.1021/acs.joc.2c02589
日期:2023.2.17
A family of polystyrene-supported (phosphoramidite, olefin) ligands L1–L4, based on the original design by Defieber and Carreira, has been developed and applied in iridium-catalyzed asymmetric allylic amination of unmasked allylic alcohols (27 examples, up to 99% ee). Among them, functional resins L1 and L4 exhibit important advantages such as easy preparation, ligand recyclability, and easy handling
基于 Defieber 和 Carreira 的原始设计,开发了一系列聚苯乙烯支持的(亚磷酰胺、烯烃)配体 L1 – L4,并将其应用于铱催化的未掩蔽烯丙醇的不对称烯丙基胺化反应(27 个实例,高达 99% ee)。其中,功能性树脂L1和L4具有重要的优点,例如易于制备、配体可回收性以及易于连续使用的处理。作为一个独特的优势,催化使用L1和L4的铱络合物允许直接重复使用复合物中涉及的高百分比昂贵的铱金属,这在相应的单体复合物的均相条件下是无法实现的。