Transition‐Metal‐Free DMAP‐Mediated Aromatic Esterification of Amides with Organoboronic Acids
作者:Tao Wang、Yanqing Wang、Kai Xu、Yuheng Zhang、Jiarui Guo、Lantao Liu
DOI:10.1002/ejoc.202100478
日期:2021.6.14
A new, transition-metal-free, effective method for aromatic esterification of amides with organoboronic acids has been developed, leading to a wide range of benzoate derivatives with yields ranging from moderate to good. The catalytic reaction shows broad substrate scope and excellent functional group tolerance.
Ligand-Controlled Chemoselective C(acyl)–O Bond vs C(aryl)–C Bond Activation of Aromatic Esters in Nickel Catalyzed C(sp<sup>2</sup>)–C(sp<sup>3</sup>) Cross-Couplings
converted into the alkylated arenes and ketone products, respectively. The utility of this newly developed protocol was demonstrated by its wide substrate scope, broad functional group tolerance and application in the synthesis of keyintermediates for the synthesis of bioactive compounds. DFT studies on the oxidative addition step helped rationalizing this intriguing reaction chemoselectivity: whereas
Nickel-Catalyzed C–CN Bond Formation via Decarbonylative Cyanation of Esters, Amides, and Intramolecular Recombination Fragment Coupling of Acyl Cyanides
An efficientnickel-catalyzed decarbonylative cyanation reaction which allows the direct functional-group interconversion of readily available esters into the corresponding nitriles was developed. This reaction successfully offers access to structurally diverse nitriles with high efficiency and excellent functional-group tolerance and provides a good alternative to classical synthetic pathways from
palladacycle‐catalyzed aromatic carbonylation reaction of arylformates with aryl iodides or bromides has been developed. Commercially available and easily prepared arylformates were employed as carbonyl sources without the use of externalcarbonmonoxide. The present catalytic system shows broad functional group tolerance and affords aryl benzoate derivatives in good to excellent yields.
An alternative route for boron phenoxide preparation from arylboronic acid and its application for C O bond formation
作者:Seong-Ryu Joo、In-Kyun Lim、Seung-Hoi Kim
DOI:10.1016/j.tetlet.2020.152197
日期:2020.8
An efficientsynthetic route to benzyl phenyl ether preparation has been successfully developed via a one-pot synthetic protocol utilizing a combination of arylboronic acids, hydrogen peroxide (H2O2), and benzyl halides. The whole procedure consists of two consecutive reactions, formation of boron phenoxide from arylboronic acids and its nucleophilic attack. A simple operation under mild conditions
通过使用芳基硼酸,过氧化氢(H 2 O 2)和苄基卤化物的组合的一锅合成方案,已经成功地开发了制备苄基苯基醚的有效合成途径。整个过程包括两个连续的反应,由芳基硼酸形成苯氧硼及其亲核攻击。已经采用了在温和条件下的简单操作,例如室温离子液体(氢氧化胆碱),有氧环境以及不存在金属和碱催化剂。也成功地完成了利用替代代苯甲酸苄酯的扩展。