化学
降冰片烯
烷基化
烯烃
卡宾
铑
选择性
反应性(心理学)
催化作用
药物化学
有机化学
聚合
医学
病理
替代医学
聚合物
标识
DOI:10.1246/bcsj.20170316
摘要
Rhodium-catalyzed alkylation reactions of C-H bonds (hydroarylation) in aromatic amides that contain an 8-aminoquinoline as a directing group with alkenes are discussed. Various alkenes, including acrylic esters, styrenes, α,β-unsaturated butyrolactones, dihydrofurans, maleimides, and norbornene derivatives are applicable to this C-H alkylation. The reaction with norbornene gives unusual endo-hydroarylation products in a high degree of selectivity. The use of a carboxylic acid as an additive dramatically increases both the reactivity and the selectivity of the reaction. The results of deuterium-labeling experiments suggest that hydrometalation or carbometalation, which are commonly accepted mechanisms for C-H alkylation reactions, are not involved. Instead, the reaction appears to proceed through a rhodium carbene intermediate generated from the alkene. Rhodium-catalyzed alkylation reactions of C-H bonds (hydroarylation) in aromatic amides that contain an 8-aminoquinoline as a directing group with alkenes are discussed. Various alkenes, including acrylic esters, styrenes, α,β-unsaturated butyrolactones, dihydrofurans, maleimides, and norbornene derivatives are applicable to this C-H alkylation. The reaction with norbornene gives unusual endo-hydroarylation products in a high degree of selectivity. The use of a carboxylic acid as an additive dramatically increases both the reactivity and the selectivity of the reaction. The results of deuterium-labeling experiments suggest that hydrometalation or carbometalation, which are commonly accepted mechanisms for C-H alkylation reactions, are not involved. Instead, the reaction appears to proceed through a rhodium carbene intermediate generated from the alkene.
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