Direct covalent immobilizaion of chiral phosphine oxide: Hollow mesoporous polystyrene nanospheres as a platform for efficient heterogeneous enantioselective reductive aldol reaction
作者:Zuyun Yin、Jie Liu、Jianing Zhang、Xuebing Ma
DOI:10.1016/j.mcat.2023.113363
日期:2023.8
with a thin and mesoporous shell suitable for fast mass transfer of reactants and products. In the asymmetric reductive aldol reaction of α, β-unsaturated ketones and benzaldehydes with HSiCl3, HMPNs@BINAPO shows the comparable good to excellent catalytic performances to homogeneous BINAPO and good reusability without an obvious decrease in diastereoselectivity and enantioselectivity.
昂贵的手性氧化膦的多相催化由于其体积庞大而受到多步骤繁琐的固定化和有限的传质的困扰。在本文中,开发了一种简单直接的策略,将(S)-2,2′-双(二苯基膦)-1,1′-二氧化联萘(BINAPO)共价锚定到中空介孔聚苯乙烯纳米球(HMPN)上来制造HMPN通过一锅 Friedel-Crafts 烷基化支持 BINAPO (HMPNs@BINAPO)。HMPNs@BINAPO 具有纳米级和球形形态,具有薄且介孔的壳,适合反应物和产物的快速传质。α,β-不饱和酮和苯甲醛与 HSiCl 3的不对称还原羟醛反应,HMPNs@BINAPO 显示出与均相 BINAPO 相当的良好至优异的催化性能以及良好的可重复使用性,而非对映选择性和对映选择性没有明显下降。