An efficient and simple palladium-catalyzed approach for the synthesis of aryl ketones from low-cost nitriles and arylhydrazines using molecular oxygen (O2) as sole oxidant via C–N bond cleavage is reported. Various aryl ketones were synthesized in moderate to good yields under mild conditions. A possible mechanism involving the PdII/Pd0 catalytic cycle process is depicted, and a cationic palladium
据报道,一种有效且简单的钯催化方法可通过低成本的腈和芳肼,使用分子氧(O 2)作为唯一氧化剂通过C–N键断裂来合成芳基酮。在温和的条件下以中等至良好的产率合成了各种芳基酮。描述了涉及Pd II / Pd 0催化循环过程的可能机理,并通过ESI-MS检测了阳离子钯中间体。
A General Synthesis of Diarylketones by Means of a Three-Component Cross-Coupling of Aryl and Heteroaryl Bromides, Carbon Monoxide, and Boronic acids
Pd(OAc)2/di-1-adamantyl-n-butylphosphine (cataCXium A) is highly active in the three-component Suzuki carbonylation and represents the most general catalyst system reported up to now. A broad range of aryl/heteroarylbromides and aryl boronic acids can be coupled to the corresponding diarylketones at low catalyst loadings.
Binuclear Palladium Complex Immobilized on Mesoporous SBA-16: Efficient Heterogeneous Catalyst for the Carbonylative Suzuki Coupling Reaction of Aryl Iodides and Arylboronic Acids Using Cr(CO)6 as Carbonyl Source
作者:Mahsa Niakan、Zahra Asadi、Mohammad Emami
DOI:10.1007/s10562-019-03087-w
日期:2020.2
a binuclear palladiumcomplex immobilized on the organo-functionalized SBA-16 was prepared and structurally characterized by routine techniques. Characterizations indicated that the mesostructure of SBA-16 was maintained after the immobilization of palladiumcomplex. Then, the prepared nanomaterial was applied as a heterogeneous catalyst in the carbonylative Suzukicouplingreaction of aryl iodides
A three-component coupling of tetramethylammonium pentacarbonyl(acyl)chromates, aryl iodides, and CO takes place under CO atmosphere in the presence of a catalytic amount of Pd(PPh3)4 to afford the corresponding unsymmetrical α-diketones in good yield. By performing the reaction under argon atmosphere, unsymmetrical ketones are prepared instead of α-diketones.
在 CO 气氛中,在一定量的 Pd(PPh3)4 催化下,四甲基五羰基(酰基)铬酸铵、芳基碘化物和 CO 发生三组份偶联反应,以良好的收率得到相应的非对称 α-二酮。在氩气环境下进行反应,可以制备出不对称酮,而不是 α-二酮。
Divergent Acyl and Decarbonylative Liebeskind–Srogl Cross-Coupling of Thioesters by Cu-Cofactor and Pd–NHC (NHC = N-Heterocyclic Carbene) Catalysis
作者:Shiyi Yang、Xiang Yu、Michal Szostak
DOI:10.1021/acscatal.2c05550
日期:2023.2.3
cross-coupling reactions of thioesters by selective acyl C(O)–S cleavage have emerged as a powerful platform for the preparation of complex molecules. Herein, we report divergent Liebeskind–Srogl cross-coupling of thioesters by Pd–NHC (NHC = N-heterocycliccarbene) catalysis. The reaction provides straightforward access to functionalized ketones by highly selective C(acyl)–S cleavage under mild conditions. Most