Catalytic Enantioselective Formation of Chiral-Bridged Dienes Which Are Themselves Ligands for Enantioselective Catalysis
作者:M. Kevin Brown、E. J. Corey
DOI:10.1021/ol9025793
日期:2010.1.1
This paper reports a method for highly enantioselective Diels−Alder reaction with an acetylene equivalent to produce chiral-bridged dienes. These dienes, by coordination to Rh(I), can serve as catalysts for the enantioselective addition of vinyl or aryl groups to α,β-unsaturated ketones.
Chiral Metal Nanoparticle Systems as Heterogeneous Catalysts beyond Homogeneous Metal Complex Catalysts for Asymmetric Addition of Arylboronic Acids to α,β-Unsaturated Carbonyl Compounds
as novel heterogeneous chiral catalysts for the asymmetric 1,4-addition of arylboronic acids to α,β-unsaturated carbonyl compounds, as representative C-C bond-forming reactions. The reactions proceeded smoothly to afford the corresponding β-arylated products in high to excellent yields and outstanding enantioselectivities with wide substrate scope. Remarkably, the nanoparticle catalysts showed performance
我们描述了手性金属纳米粒子系统作为新型多相手性催化剂的用途,用于芳基硼酸与 α,β-不饱和羰基化合物的不对称 1,4-加成反应,作为代表性的 CC 键形成反应。反应顺利进行,以高产率和优异的对映选择性提供相应的 β-芳基化产物,底物范围广。值得注意的是,纳米颗粒催化剂在产率、对映选择性和催化转化率方面表现出优于相应的均相金属配合物的性能。该催化剂可以成功回收并重新用于克级合成,催化剂负载量低,而不会显着损失活性。研究了活性物种的性质,