Deprotonative directed ortho cupration of aromatic/heteroaromatic C-H bond and subsequent oxidation with t-BuOOH furnished functionalized phenols in high yields with high regio- and chemoselectivity. DFT calculations revealed that this hydroxylation reaction proceeds via a copper (I → III → I) redox mechanism. Application of this reaction to aromatic C-H amination using BnONH2 efficiently afforded
芳族/杂芳族 CH 键的去质子定向邻铜化和随后用 t-BuOOH 氧化以高产率和高区域选择性和化学选择性提供官能化酚。DFT 计算表明,这种羟基化反应是通过铜 (I → III → I) 氧化还原机制进行的。将该反应应用于使用 BnONH2 的芳族 CH 胺化有效地提供了相应的伯苯胺。这些反应显示出广泛的范围和良好的官能团兼容性。还展示了这些转化的催化版本。
Rhodium(III)-Catalyzed Direct CH Olefination of Arenes with Aliphatic Olefins
A rhodium(III)‐catalyzed direct ortho CH bond olefination of arenes, including but not limited to benzamides, arylpyridines and indoles, with a variety of unactivated aliphatic olefins has been developed. In the presence of catalytic amounts of dichloro(pentamethylcyclopentadienyl)rhodium(III) dimer [Cp*RhCl2]2}, copper(II) acetate monohydrate [Cu(OAc)2⋅H2O] and silver hexafluoroantimonate(V) (AgSbF6)
Asymmetric Deoxygenative Alkynylation of Tertiary Amides Enabled by Iridium/Copper Bimetallic Relay Catalysis
作者:Zhaokun Li、Feng Zhao、Wei Ou、Pei‐Qiang Huang、Xiaoming Wang
DOI:10.1002/anie.202111029
日期:2021.12.13
An Ir/Cu bimetallicrelaycatalysis was developed to achieve the challenging asymmetricdeoxygenativealkynylation of inert amides under mild conditions, affording a series of synthetically important chiral propargylamines in high yields with good to excellent enantioselectivities.
A Direct and Mild Conversion of Tertiary Aryl Amides to Methyl Esters Using Trimethyloxonium Tetrafluoroborate: A Very Useful Complement to Directed Metalation Reactions
作者:Gary E Keck、Mark D McLaws、Travis T Wager
DOI:10.1016/s0040-4020(00)00969-8
日期:2000.12
of tertiary amides directly to methyl esters has been investigated. The process involves a two-step, one pot procedure in which a tertiary amide is first treated with trimethyloxonium tetrafluoroborate to generate an imidate intermediate which is then hydrolyzed, generally by the addition of saturated aqueous sodium bicarbonate solution. Although this process fails for aliphaticamides, very good yields
Rhodium(III) and Hexabromobenzene-A Catalyst System for the Cross-Dehydrogenative Coupling of Simple Arenes and Heterocycles with Arenes Bearing Directing Groups
can be used as the cooxidant/catalyst modifier for the [RhIIICp*]‐catalyzed (Cp*=C5Me5) dehydrogenativecross‐coupling of benzamides with simple benzene derivatives (see scheme, DG=directing group). Similarly, heterocycles can be coupled and druglike structures formed. Mechanistic studies suggest a unique and multiple role of the Cu(OAc)2/C6Br6 system and a nonchelate‐assisted CH activation as the
C 6 Br六和 毒品!C 6 Br 6可用作苯甲酰胺与简单苯衍生物的[Rh III Cp *]催化(Cp * = C 5 Me 5)脱氢交叉偶联的助氧化剂/催化剂改性剂(请参见方案,DG =指导基团)。类似地,杂环可以偶联并形成药物样结构。机理研究表明,Cu(OAc)2 / C 6 Br 6系统具有独特的多重作用,而非螯合物辅助的CH活化是决定速率的步骤。