Visible-Light-Mediated Direct Decarboxylative Acylation of Electron-Deficient Heteroarenes Using α-Ketoacids
作者:Sabyasachi Manna、Kandikere Ramaiah Prabhu
DOI:10.1021/acs.joc.9b00004
日期:2019.5.3
Acylation of electron-deficient heteroaromatic compounds has been developed using visible light. α-Ketoacids have been used as an efficient source of acyl radicals under photoredox conditions. The in situ generated acyl radicals from α-ketoacids have been coupled to a wide variety of electron-deficient heteroaromatic compounds in a Minisci type reaction. This method would be attractive to access biologically
Radical C−H Acylation of Nitrogen Heterocycles Induced by an Aerobic Oxidation of Aldehydes
作者:Subhasis Paul、Manotosh Bhakat、Joyram Guin
DOI:10.1002/asia.201900857
日期:2019.9.16
ketones is described herein. The reaction involves cross-dehydrogenative coupling between aldehydes and heteroaromatic bases with molecularoxygen (O2 ). The key aspect of the method is the generation of reactive acyl radical via homolytic activation of aldehyde C-H bond using O2 as the sole oxidant. The reaction has a good substrate scope with respect to aldehydes and functionalized nitrogen heterocycles
Synthesis of Axially Chiral 1,1′-Binaphthalenes by Palladium-Catalysed Cross-Coupling Reactions of Triorganoindium Reagents
作者:Ángeles Mosquera、Miguel A. Pena、José Pérez Sestelo、Luis A. Sarandeses
DOI:10.1002/ejoc.201300042
日期:2013.5
heterocyclic analogues can be efficiently prepared by palladium-catalysedcross-couplingreactions between tri(1-naphthyl)indium reagents and 1-halonaphthalenes and haloisoquinolines. The reactions were usually carried out in THF at 80 °C with a slight excess of the indium reagent (40 mol-%) and a low catalyst loading (4 mol-% Pd) to afford the cross-coupling products in good yields (45–99 %). The method allows
Construction of Heterobiaryl Skeletons through Pd-Catalyzed Cross-Coupling of Nitroarenes and Heterocyclic Arylborononate Esters with a Sterically Demanding NHC Ligand
作者:Wei Chen、Wanzhi Chen、Miaochang Liu、Huayue Wu
DOI:10.1021/acs.orglett.2c02796
日期:2022.9.30
cross-couplings of nitroarenes and heteroarylboronate esters has been developed. A number of heterobiaryl compounds containing pyridine, pyrimidine, quinoline, furan, thiophene, and pyrazole were prepared using [Pd(cinnamyl)Cl]2/2-aryl-5-(2,4,6-triisopropylphenyl)-2,3-imidazolylidene[1,5-a]pyridines as the catalysts in good to excellent yields. The synthetic practicality of this approach is demonstrated through
已经开发了钯催化的硝基芳烃和杂芳基硼酸酯的 Suzuki-Miyaura 交叉偶联。使用[Pd(肉桂基)Cl] 2 /2-芳基-5-(2,4,6-三异丙基苯基)-2,3-制备了许多含有吡啶、嘧啶、喹啉、呋喃、噻吩和吡唑的杂二芳基化合物咪唑亚基[1,5- a ]吡啶作为催化剂,收率良好。这种方法的合成实用性通过类药物分子的合成得到证明。
Photocatalytic Aerobic Coupling of Azaarenes and Alkanes via Nontraditional Cl<sup>•</sup> Generation
作者:Manotosh Bhakat、Bitasik Khatua、Joyram Guin
DOI:10.1021/acs.orglett.2c01784
日期:2022.7.29
photocatalytic generation of Cl• from a common chlorinated solvent, dichloroethane, under aerobic conditions and its successful utilization toward the cross-dehydrogenative coupling of alkanes and azaarenes via hydrogen atom transfer with Cl•. The process is free from chloride salt, toxic oxidant, and UV light. It is applicable to a broad spectrum of substrates. The proposed mechanism involving Cl• is