Carbon Dioxide-Mediated C(<i>sp</i><sup>2</sup>)–H Arylation of Primary and Secondary Benzylamines
作者:Mohit Kapoor、Pratibha Chand-Thakuri、Michael C. Young
DOI:10.1021/jacs.9b03375
日期:2019.5.15
the pharmacological importance of ortho-arylbenzylamines, however, effective ortho-C-C bond formation of free primary and secondarybenzylamines using PdII remains an outstanding challenge. Presented herein is a new strategy for constructing ortho-arylated primary and secondarybenzylamines mediated by carbon dioxide (CO2). The use of CO2 with Pd is critical to allowing this transformation to proceed
通过过渡金属催化的 CH 活化形成 CC 键已成为快速制造新键的重要策略。然而,尽管邻芳基苄胺具有药理学重要性,但使用 PdII 形成游离伯胺和仲苄胺的有效邻 CC 键仍然是一个突出的挑战。本文提出了一种用于构建由二氧化碳 (CO2) 介导的邻位芳基化伯和仲苄胺的新策略。CO2 与 Pd 的使用对于允许这种转化在相对温和的条件下进行至关重要,机械研究表明它 (CO2) 直接参与速率决定步骤。此外,较温和的温度提供了无需脱保护即可直接使用或加工的游离胺产品。
Carbon Dioxide-Driven Palladium-Catalyzed C–H Activation of Amines: A Unified Approach for the Arylation of Aliphatic and Aromatic Primary and Secondary Amines
site-selective γ-arylation of alkyl- and benzylic amines via a palladium-catalyzed C–H bond-activation process. By using carbon dioxide as an inexpensive, sustainable, and transient directing group, a wide variety of amines were arylated at either γ-sp3 or sp2 carbon–hydrogen bonds with high selectivity based on substrate and conditions. This newly developed strategy provides straightforward access to important
One-Pot C–H Arylation/Lactamization Cascade Reaction of Free Benzylamines
作者:Pratibha Chand-Thakuri、Vinod G. Landge、Mohit Kapoor、Michael C. Young
DOI:10.1021/acs.joc.0c00542
日期:2020.5.15
ortho-arylation of benzylamines followed by in situ lactamization. This cascade sequence is enabled by the use of 2-iodobenzoates, which facilitates C-H arylation from the free amine under conditions that typically require an improved directing group approach. This reaction is characterized by a broad substrate scope with good functional group tolerance. The need for an ester versus carboxylic acid-functionalized
Native Amine-Directed ortho-C–H Halogenation and Acetoxylation /Condensation of Benzylamines
作者:Michael C. Young、Pratibha Chand-Thakuri、Indunil Alahakoon、Daniel Liu、Mohit Kapoor、John F. Kennedy、Kenneth W. Jenkins、Allison M. Rabon
DOI:10.1055/a-1625-9095
日期:2022.1
Free or unfunctionalized benzylamines are well known to participate in C–H activation in the presence of palladium salts. Despite the ease with which these complexes can be activated, subsequent functionalization of the dimeric cyclometalates can be challenging. We demonstrate herein a free primary amine based C–H activation/functionalization protocol that allows for the ortho-C–H chlorination and