A cobalt-catalyzed decarboxylative methylation of aliphatic redox-active esters [N-(acyloxy)phthalimides; RAEs] with trimethylaluminum under mild conditions was developed, providing a method for transforming a carboxylate group into a methyl group without redox fluctuation. Primary and secondary RAEs were both amenable substrates, whereas a tertiary RAE delivered an elimination product. Triethylaluminum
脂肪族氧化还原活性酯 [N-(酰氧基)邻苯二甲酰亚胺;RAEs] 与三甲基铝在温和条件下的开发,提供了一种将羧酸盐基团转化为甲基基团而没有氧化还原波动的方法。一级和二级 RAE 都是适合的底物,而三级 RAE 提供消除产物。三乙基铝也用于提供脱羧乙基化产物。
An Efficient Copper-Catalyzed Etherification of Aryl Halides
An efficient and mild copper-catalyzed ether formation from arylhalides and aliphatic alcohols has been developed. The key to the successful coupling is the use of lithium alkoxide, directly or in situ generated by lithium tert-butoxide, and the corresponding alcohol as solvent.
Synthesis of Alkyl Aryl Ethers by O-Arylation of Alcohols with Diaryliodonium Salts: Scope, Limitations, and Mechanism
作者:David R. Stuart、Rory T. Gallagher、Soocheta Jha、Bryan E. Metze
DOI:10.1055/a-2198-3637
日期:2024.5
6-trimethoxyphenyl)iodonium salts and aliphatic alcohols under weak base conditions. The scope of the reaction is presented, with 16 examples ranging in yield from moderate to high (54–96%). The limitations of the reaction are also presented. Mechanistic experiments reveal a complex network of reactions that include side reactions that generate arynes and oxidize the alcohol nucleophile.
are demonstrated as efficient arylating agents of aliphaticalcohols under metal‐free conditions. The reaction proceeds at roomtemperature within 90 min to give alkyl aryl ethers in good to excellent yields. Aryl groups with electron‐withdrawing substituents are transferred most efficiently, and unsymmetric iodonium salts give chemoselective arylations. The methodology has been applied to the formal