交叉亲电反应是 CC 键形成的一个有前景的策略。最近的研究主要集中在与有机卤化物的反应上。在这里,我们报告了 CN 和 CO 亲电试剂之间的偶联反应,证明了通过 CN 和 CO 裂解构建 CC 键的可能性。已经研究了苄基/芳基铵盐和乙烯基/芳基 CO 亲电试剂之间的几种反应。初步机理研究表明,苄基铵是通过自由基机制活化的。
direct cross‐coupling reaction between diarylzinc (Ar2Zn) and aryltrimethylammonium salts (ArNMe3+⋅−OTf) in the presence of LiCl, via C−N bond cleavage. The reaction takes place smoothly upon heating in THF without any external catalyst, enabling an efficient and chemoselective formation of biaryl products. Mechanistic studies indicate that the reaction proceeds through a single electrontransfer route
We have developed a simple and direct method for the synthesis of arylethers by reacting alcohols/phenols (ROH) with aryl ammonium salts (ArNMe3+), which are readily prepared fromanilines (ArNR′2, R′=H or Me). This reaction proceeds smoothly and rapidly (within a few hours) at room temperature in the presence of a commercially available base, such as KOtBu or KHMDS, and has a broad substrate scope
This work describes a base-mediated borylsilylation of benzylic ammoniumsalts to synthesize geminal silylboronates bearing benzylic proton under mild reaction conditions. Deaminative silylation of aryl ammoniumsalts was also achieved in the presence of LiOtBu. This strategy which is featured with high efficiency, mild reaction conditions, and good functional group tolerance provides efficient routes
这项工作描述了碱介导的苄基铵盐的硼基甲硅烷基化,以在温和的反应条件下合成带有苄基质子的孪晶甲硅烷基硼酸酯。在 LiO t Bu存在下也实现了芳基铵盐的脱氨基甲硅烷基化。该策略具有高效、反应条件温和、官能团耐受性好的特点,为胺类的后期官能化提供了有效途径。
Construction of C–C Bond via C–N and C–O Cleavage
作者:Xiaobo Pang、Rong-De He、Xing-Zhong Shu
DOI:10.1055/s-0039-1691525
日期:2020.4
possibility of construction of C–C bond via C–N and C–O cleavage. A number of reactions between benzyl ammoniums and vinyl acetates, aryl ammoniums and vinyl acetates, and benzyl ammoniums and aryl C–O electrophiles have been studied. We also disclosed that benzyl ammonium salts can be activated by low-valent nickel to be radicals. 1 Introduction 2 Cross-Coupling of C–N and C–O Electrophiles 3 Summary
Synthesis of Phenols from Aryl Ammonium Salts under Mild Conditions
作者:Pufan Ni、Lei Yang、Yi Shen、Lei Zhang、Yueyue Ma、Maolin Sun、Ruihua Cheng、Jinxing Ye
DOI:10.1021/acs.joc.2c01133
日期:2022.10.7
A general method for the synthesis of phenols from electron-deficient aryl ammonium salts or heteroaryl ammonium salts undermildconditions was developed. Benzaldehyde oxime, acetohydroxamic acid, and hydroxylamine hydrochloride were investigated as hydroxide surrogates respectively. With these hydroxide surrogates, a series of phenols were prepared in yields of 20–98%.