Selective Electrochemical Oxygenation of Alkylarenes to Carbonyls
作者:Xue Li、Fang Bai、Chaogan Liu、Xiaowei Ma、Chengzhi Gu、Bin Dai
DOI:10.1021/acs.orglett.1c02651
日期:2021.10.1
An efficient electrochemical method for benzylic C(sp3)–H bond oxidation has been developed. A variety of methylarenes, methylheteroarenes, and benzylic (hetero)methylenes could be converted into the desired aryl aldehydes and aryl ketones in moderate to excellent yields in an undivided cell, using O2 as the oxygensource and lutidinium perchlorate as an electrolyte. On the basis of cyclic voltammetry
已经开发了一种用于苄基 C(sp 3 )-H 键氧化的有效电化学方法。各种甲基芳烃、甲基杂芳烃和苄基(杂)亚甲基可以在未分割的电池中以中等至极好的收率转化为所需的芳醛和芳酮,使用 O 2作为氧源,高氯酸镥作为电解质。在循环伏安法研究、18 O 标记实验和自由基捕获实验的基础上,提出了一种可能的单电子转移机制用于电氧化反应。
A simple synthesis of ketone from carboxylic acid using tosyl chloride as an activator
作者:Debasis Sahoo、Sohini Sarkar、Samaresh Jana
DOI:10.1016/j.tetlet.2019.151084
日期:2019.9
An effective process for the conversion of carboxylic acid to ketone has been discovered. In this process, carboxylic acid has been activatedusing p-toluene sulphonyl group. Under the optimized condition, aromatic, aliphatic heteroaromatic carboxylic acids have been proved to be good substrates for this methodology. The byproduct of this reaction can be removed very easily during work up process.
Stereodivergent Synthesis of Trisubstituted Enamides: Direct Access to Both Pure Geometrical Isomers
作者:Luca Massaro、Jianping Yang、Suppachai Krajangsri、Emanuele Silvi、Thishana Singh、Pher G. Andersson
DOI:10.1021/acs.joc.9b01803
日期:2019.11.1
either (E)- or (Z)-isomers of trisubstituted enamides. Starting from an extensive range of ketones, it was possible to synthesize and isolate the desired pure isomer by switching the reaction conditions. Lewis acid activation enables the formation of the (E)-isomers in high stereoselectivity (>90:10) and good yields. On the other hand, the use of a Brønsted acid allows the preparation of the (Z)-isomers
A novel cobalt(II)porphyrin-mediated acceptorless dehydrogenation of methanol is reported for the first time. This methodology has been applied for the coupling of a variety of ketones with methanol to produce 1,5-diketones along with H2 and H2O as the environment friendly byproducts. This paradigm was also demonstrated for a one-pot synthesis of substitutedpyridines using a sequential addition protocol
The iron(III)-catalyzed cross-coupling reaction between Grignard reagents and acylchlorides was found to be widely applicable to the synthesis of various functionalized ketones in good yields under mild conditions; the series of examples includes the synthesis of chiral methyl ketones and symmetric diketones.