Heterogeneous Chiral Diene‐Rh Complexes for Asymmetric Arylation of α,β‐Unsaturated Carbonyl Compounds, Nitroalkenes, and Imines
作者:Tatsuya Kuremoto、Tomohiro Yasukawa、Shū Kobayashi
DOI:10.1002/adsc.201900526
日期:2019.8.21
A chiral diene ligand with tertiary alkyl amine‐derived secondary amide moiety was immobilized on cross‐linked polystyrene (PS) by radical polymerization, which was combined with Rh to form heterogeneous chiral Rh complexes (PS‐diene Rh−Cl). PS‐diene Rh−Cl catalyzed asymmetric arylation reactions of α,β‐unsaturated carbonyl compounds (ketones, esters, and amides), nitroalkenes, and imines afforded
通过自由基聚合将具有叔烷基胺衍生的仲酰胺部分的手性二烯配体固定在交联的聚苯乙烯(PS)上,然后与Rh结合形成异质的手性Rh络合物(PS-diene Rh-Cl)。PS-二烯Rh-Cl催化的α,β-不饱和羰基化合物(酮,酯和酰胺),硝基烯烃和亚胺的不对称芳基化反应以高收率提供了所需的产物,并具有出色的对映选择性。PS-二烯Rh-Cl在空气中稳定,可以存放几个月,可以重复使用10次以上,而不会降低收率或对映选择性。我们还开发了一种活化PS-二烯Rh-Cl以生成更多活性物质的方法。