Combining Transition Metal Catalysis with Radical Chemistry: Dramatic Acceleration of Palladium-Catalyzed CH Arylation with Diaryliodonium Salts
作者:Sharon R. Neufeldt、Melanie S. Sanford
DOI:10.1002/adsc.201200738
日期:2012.12.14
This paper describes a photoredox palladium/iridium-catalyzed C-H arylation with diaryliodonium reagents. Details of the reaction optimization, substrate scope, and mechanism are presented along with a comparison to a related method in which aryldiazonium salts are used in place of diaryliodonium reagents. The unprecedentedly mild reaction conditions (25 masculineC in methanol), the requirement for
Iridium(<scp>iii</scp>)-catalyzed regioselective direct arylation of sp<sup>2</sup> C–H bonds with diaryliodonium salts
作者:Pan Gao、Li Liu、Zhuangzhi Shi、Yu Yuan
DOI:10.1039/c6ob01145d
日期:——
A regioselectivedirectarylation of arenes and olefins at the ortho position is reported. The key to the high selectivity is the appropriate choice of diaryliodonium salts as the arylating reagent in the presence of a cationic iridium(III) catalyst. The coordination of the metal with an oxygen atom or a nitrogen atom and subsequent C–H activation allows for directarylation with coupling partners
Compounds and Methods for Catalytic Directed ortho Substitution of Aromatic Amides and Esters
申请人:Zhao Yigang
公开号:US20120302752A1
公开(公告)日:2012-11-29
Methods are described for efficient and regioselective reactions that are Ru-catalyzed and either (i) amide-directed C—H, C—N, C—O activation/C—C bond forming reactions, (ii) ester-directed C—O and C—N activation/C—C bond forming reactions, or (iii) amide-directed C—O activation/hydrodemethoxylation reactions. All of these reactions of directed C—H, C—N, C—O activation/coupling reactions establish a catalytic base-free DoM-cross coupling process at non-cryogenic temperature. High regioselectivity, yields, operational simplicity, low cost, and convenient scale-up make these reactions suitable for industrial applications. Many previously unknown amide-substituted or ester-substituted aryl and heteroaryl compounds are presented with synthetic details also provided.
Aminocarbonylation of Aryl Halides Using a Nickel Phosphite Catalytic System
作者:Jinhun Ju、Miso Jeong、Jeongju Moon、Hyun Min Jung、Sunwoo Lee
DOI:10.1021/ol702058e
日期:2007.10.1
The nickel and phosphite catalytic system with sodium methoxide enables a very efficient aminocarbonylation reaction to be performed between aryl iodides or bromides and N,N-dimethylformamide (DMF). Phosphite ligand 1, which is very stable to air and moisture and, furthermore, inexpensive, afforded the highest reaction yield.
method for the copper-catalyzed synthesis of N-substitutedbenzamides was explored. In the presence of CuBr and di-tert-butyl peroxide, various N-substitutedbenzamides were prepared through amidation of benzoic acid by using commercially available and cheap tetraalkylthiuram disulfides as amine sources. With this protocol, a series of 14 N-substitutedbenzamides were furnished in good to excellent yields
摘要 探索了一种简便的铜催化合成 N-取代苯甲酰胺的方法。在 CuBr 和二叔丁基过氧化物的存在下,使用市售的廉价四烷基秋兰姆二硫化物作为胺源,通过苯甲酸的酰胺化制备了各种 N-取代的苯甲酰胺。使用该协议,提供了一系列 14 N 取代苯甲酰胺,产量良好。广泛的底物范围和良好的收率显示了其在有机合成中的实用合成价值。图形概要