对映选择合成
对称化
化学
硼氢化
立体中心
配体(生物化学)
立体化学
合作性
硼酸化
酰胺
催化作用
广场互动
齿合度
烷基
组合化学
有机化学
金属
芳基
受体
生物化学
作者
Tianhang Wang,Minyan Wang,Yandong Wang,Mingjie Li,Youdou Zheng,Qianwei Chen,Yue Zhao,Zhuangzhi Shi
出处
期刊:Chem
[Elsevier]
日期:2023-01-01
卷期号:9 (1): 130-142
被引量:1
标识
DOI:10.1016/j.chempr.2022.09.014
摘要
•Chemoselective C–C borylation ahead of the competitive C–H borylation •Distinguishing the proximal and distal C–C σ-bonds of cyclopropanes •Ligand cooperativity leading to excellent enantioselectivity •Mechanistic probes of ligand roles and the key steps of σ-hydroboration Given the utility of enantioenriched alkylboronates, asymmetric borylation has attracted substantial research interest in recent decades. Herein, a catalytic enantioselective hydroboration through desymmetrization of enantiotopic carbons in cyclopropanes involving C–C bond activation is reported. Treatment of cyclopropanes bearing an amide directing group in the presence of rhodium catalysis using HBpin as a boron source allows the construction of a series of alkyl boronates containing γ-stereogenic amines. The key to high enantioselectivity relies on two distinct ligands that act cooperatively: an exogenous monodentate chiral phosphite that induces enantioselectivity and an endogenous acetylacetonate that exerts a remarkably positive influence on the enhancement of enantioselectivity. Detailed experimental and computational studies elucidate the effect of ligand cooperativity and the key steps involving σ-bond activation process, C–B bond formation, and the absolute configuration of products. Given the utility of enantioenriched alkylboronates, asymmetric borylation has attracted substantial research interest in recent decades. Herein, a catalytic enantioselective hydroboration through desymmetrization of enantiotopic carbons in cyclopropanes involving C–C bond activation is reported. Treatment of cyclopropanes bearing an amide directing group in the presence of rhodium catalysis using HBpin as a boron source allows the construction of a series of alkyl boronates containing γ-stereogenic amines. The key to high enantioselectivity relies on two distinct ligands that act cooperatively: an exogenous monodentate chiral phosphite that induces enantioselectivity and an endogenous acetylacetonate that exerts a remarkably positive influence on the enhancement of enantioselectivity. Detailed experimental and computational studies elucidate the effect of ligand cooperativity and the key steps involving σ-bond activation process, C–B bond formation, and the absolute configuration of products.
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