Mechanistic Insight into Cu-Catalyzed C–N Coupling of Hindered Aryl Iodides and Anilines Using a Pyrrol-ol Ligand Enables Development of Mild and Homogeneous Reaction Conditions

Mechanistic Insight into Cu-Catalyzed C–N Coupling of Hindered Aryl Iodides and Anilines Using a Pyrrol-ol Ligand Enables Development of Mild and Homogeneous Reaction Conditions
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使用吡咯-醇配体对铜催化受阻芳基碘化物和苯胺的 C-N 偶联机理进行深入研究,可开发温和且均相的反应条件

DOI:
10.1021/acscatal.2c06201
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发表时间:
2023
期刊:
影响因子:
12.9
通讯作者:
Blackmond, Donna G.
Blackmond, Donna G.
中科院分区:
化学1区
文献类型:
--
作者:
de Gombert, Antoine;Darù, Andrea;Ahmed, Tonia S.;Haibach, Michael C.;Li-Matsuura, Rei;Yang, Cassie;Henry, Rodger F.;Cook, Silas P.;Shekhar, Shashank;Blackmond, Donna G.

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对Cu催化的空间位阻芳基碘与空间位阻苯胺的C-N偶联反应进行了机理研究,以阐明最近报道的吡咯醇配体如何影响该反应。动力学,光谱和计算工具有助于探测活性催化剂物种的性质和循环中的速率决定步骤。与大多数已知的Cu系统相反,发现氧化加成先于胺的配位。这些研究有助于设计一种在温和条件下使用完全均相系统的有效工艺,以及通过温度扫描和控制碱的添加实现高产率的方案。XX型配体获得的见解可能会导致在铜催化偶联反应中挑战底物类的一般方法。
Mechanistic studies of the Cu-catalyzed C–N coupling of sterically hindered aryl iodides with sterically hindered anilines are carried out to shed light on how a recently reported pyrrol-ol ligand affects the reaction. Kinetic, spectroscopic, and computational tools help to probe the nature of the active catalyst species and the rate-determining step in the cycle. In contrast to most known Cu systems, oxidative addition is found to precede coordination of the amine. These studies help to design an efficient process under mild conditions using a fully homogeneous system as well as protocols that enable high yields by temperature scanning and controlled addition of the base. The insights obtained for the XX-type ligand may lead to a general approach for challenging substrate classes in Cu-catalyzed coupling reactions.
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