Iron-Catalyzed Regioselective α-C–H Alkylation of <i>N</i>-Methylanilines: Cross-Dehydrogenative Coupling between Unactivated C(sp<sup>3</sup>)–H and C(sp<sup>3</sup>)–H Bonds via a Radical Process
作者:Ze-Lin Li、Kang-Kang Sun、Peng-Yu Wu、Chun Cai
DOI:10.1021/acs.joc.9b00625
日期:2019.6.7
without any directing group by cross-dehydrogenative coupling between unactivatedC(sp3)–H and C(sp3)–Hbonds has been established for the first time, which provides a good complement to C(sp3)–Hactivation reactions and expands the field of Fe-catalyzed C–H functionalizations. Many different C(sp3)–Hbonds in cyclic alkanes, cyclic ethers, and toluene derivatives can be used as coupling partners. Mechanistic
A transition metal‐freeN‐arylation of primary and secondary amines with diaryliodonium salts is presented. Both acyclic and cyclic amines are well tolerated, providing a large set of N‐alkyl anilines. The methodology is unprecedented among metal‐free methods in terms of amine scope, the ability to transfer both electron‐withdrawing and electron‐donating aryl groups, and efficient use of resources
Kinetics and mechanism of reactions between 2-phenylethyl benzenesulphonates and anilines in methanol
作者:Ikchoon Lee、Yong Hoon Choi、Hai Whang Lee、Byung Choon Lee
DOI:10.1039/p29880001537
日期:——
Kinetics of reactions between 2-phenylethyl benzenesulphonates and anilines in methanol at 65.0 °C have been studied; the mechanism is discussed on the basis of crossinteractionconstants, ρij. The overall reaction was found to proceed by a dissociative SN2 mechanism with a relatively small degree of aryl participation. The fraction of the phenonium ion intermediate captured by the nucleophile, aniline
研究了在65.0°C下2-苯乙基苯磺酸盐与苯胺在甲醇中的反应动力学。该机构被交叉相互作用常数,ρ的基础上讨论IJ。发现整个反应是通过离解的S N 2机理进行的,其中芳基的参与程度相对较小。亲核辅助途径中,亲核试剂苯胺所捕获的苯离子中间体的分数已显示出随着亲核试剂的增强而增加,并且对于芳基-建议在分子间S N i机理中出现四中心过渡态。无辅助路径。
Enabling Reductive C–N Cross-Coupling of Nitroalkanes and Boronic Acids by Steric Design of P(III)/P(V)═O Catalysts
作者:Gen Li、Yuzuru Kanda、Seung Youn Hong、Alexander T. Radosevich
DOI:10.1021/jacs.2c01487
日期:2022.5.11
bond-forming reductive coupling of nitroalkanes with arylboronicacids and esters is reported. The method shows excellent chemoselectivity for the nitro/boronicacid substrate pair, allowing the synthesis of N-(hetero)arylamines rich in functionalization. The identification of a sterically reduced phosphetane catalyst capable of productive coupling in the P(III)/P(V)═O redox manifold is the key enabling development
Iridium-catalyzed reductive amination of carboxylic acids
作者:Lu Ouyang、Rui Miao、Zhanhui Yang、Renshi Luo
DOI:10.1016/j.jcat.2023.01.030
日期:2023.2
Our Ir-catalyzed reductiveamination of carboxylic acids with amines produces structurally diverse N-alkylated amines in good to excellent yields (up to 60 examples). This protocol is advantageous of mild conditions, convenient operations, and excellent functionality tolerance. The synthetic values are highlighted through the synthesis of two pharmaceutical molecules-Cinacalcet and (R)-Fendiline.
我们的 Ir 催化的羧酸与胺的还原胺化反应产生结构多样的N-烷基化胺,收率非常好(多达 60 个例子)。该协议具有条件温和、操作方便、功能容错性好等优点。通过合成两种药物分子——Cinacalcet 和 ( R )-Fendiline,突出了合成价值。