Synthesis of unsymmetrical benzils <i>via</i> palladium-catalysed α-arylation–oxidation of 2-hydroxyacetophenones with aryl bromides
作者:Takanori Matsuda、Souta Oyama
DOI:10.1039/d0ob00575d
日期:——
cross-coupling reaction between 2-hydroxyacetophenones and aryl bromides in the presence of a palladium catalyst. Experimental studies suggested a reaction mechanism involving a one-pot tandem palladium-catalysed α-arylation and oxidation, where aryl bromides play a dual role as mild oxidants as well as arylating agents.
One-Pot Synthesis of Unsymmetrical Benzils by Oxidative Coupling Using Selenium Dioxide and p-Toluenesulfonic Acid Monohydrate
作者:Md. Rumum Rohman、Icydora Kharkongor、Mantu Rajbangshi、Hormi Mecadon、Badaker M. Laloo、Priti R. Sahu、Iadeishisha Kharbangar、Bekington Myrboh
DOI:10.1002/ejoc.201101012
日期:2012.1
The oxidative coupling of the α-carbon atom of aromatic ketones with unactivated arenes in the presence of seleniumdioxide and p-toluenesulfonic acid monohydrate is described. A number of unsymmetrical benzils have been prepared in good yields (38–75 %) with high regioselectivity. The generality and functional tolerance of this new protocol is demonstrated. The mechanistic pathway for the oxidative
Electrochemical oxidation-induced benzyl C H carbonylation for the synthesis of aromatic α-diketones
作者:Yu-Fang Tan、Yuan Chen、Rui-Xue Li、Zhi Guan、Yan-Hong He
DOI:10.1016/j.tetlet.2021.153593
日期:2022.1
direct carbonylation of benzyl CH bond for the synthesis of aromatic α-diketones is described. In this process, tetrabutylammonium iodide (nBu4NI) not only acts as an electrolyte, but its iodine anion is oxidized to an iodine radical at the anode, acting as a hydrogen atom transfer agent. The iodine radical extracts the benzyl hydrogen atom and causes the carbonylation of the benzyl position, where O2 in
描述了电化学氧化诱导的苄基 C H 键直接羰基化合成芳族 α-二酮。在这个过程中,四丁基碘化铵(n Bu 4 NI)不仅起到电解质的作用,而且其碘阴离子在阳极被氧化成碘自由基,起到氢原子转移剂的作用。碘自由基提取苄基氢原子并引起苄基位置的羰基化,其中空气中的O 2用作氧源。