Magnetic magnetite nanoparticals catalyzed selective oxidation of α-hydroxy ketones with air and one-pot synthesis of benzilic acid and phenytoin derivatives
A clean and efficient protocol for selective oxidation of α-hydroxy ketones using magnetic magnetite nanoparticals (Fe3O4·MNPs) as catalyst with air as green oxidant has been developed. Application of Fe3O4·MNPs was also proved to be successful in one-pot synthesis of benzilic acid and phenytoin derivatives. The facile one-pot procedure enhanced the production efficiency, shortened the reaction time
已开发出一种清洁有效的方案,以磁性磁铁矿纳米粒子(Fe 3 O 4 ·MNPs)为催化剂,以空气为绿色氧化剂,选择性氧化α-羟基酮。Fe 3 O 4 ·MNPs在单锅合成苯甲酸和苯妥英衍生物中也被证明是成功的。简便的一锅法提高了生产效率,缩短了反应时间,并最大程度地减少了化学废物。值得注意的是,该催化剂可以重复使用至少五次,而没有任何明显的活性损失。
One-pot cascade synthesis of α-diketones from aldehydes and ketones in water by using a bifunctional iron nanocomposite catalyst
作者:Tao Song、Xin Zhou、Xiaoxue Wang、Jianliang Xiao、Yong Yang
DOI:10.1039/d0gc03739g
日期:——
A new methodology for the synthesis of α-diketones was reported via a one-pot cascade process from aldehydes and ketones catalyzed by a bifunctional iron nanocompositeusing H2O2 as a green oxidant in water. The one-pot strategy showed excellent catalytic stability, comprehensive suitability of substrates and important practical utility for directly synthesizing biologically active and medicinally
据报道,通过双锅铁纳米复合物在水中使用H 2 O 2作为绿色氧化剂,通过醛和酮的一锅级联过程,合成了一种合成α-二酮的新方法。一锅法显示出优异的催化稳定性,底物的全面适用性和重要的实际实用性,可通过间歇过程直接合成具有生物活性和医学价值的N-杂环。
A Simple and Improved Procedure for the Conversion of Alkynes to 1,2-Diketones by Indirect Electrooxidation With Ruthenium Tetroxide as a Mediator
作者:Sigeru Torii、Tsutomu Inokuchi、Youzou Hirata
DOI:10.1055/s-1987-27950
日期:——
Indirect electrooxidation of alkynes 1 using ruthenium tetroxide as a mediator, leading to 1,2-diones 2 in 72-87%, is described. The electrolysis is carried out in the presence of a catalytic amount of ruthenium dioxide dihydrate in a two phase system of saturated aqueous sodium chloride and carbon tetrachloride. The overoxidation of 1,2-diones to the corresponding carboxylic acid, an unavoidable drawback generally encountered in the metal oxidation of acetylenes, is suppressed greatly by maintaining the pH of the aqueous phase at 4 and conducting the reaction at 0-5°C. The synthetic utility of this electrochemical oxidation is exemplified by the preparation of 2i (82%), a key intermediate for the synthesis of furaneol 4, from the commercially available 1i.
A catalyst-free and transition-metal-free method for the synthesis of 1,2-diketones from aerobic alkyne oxidation was reported. The oxidation of various internal alkynes, especially more challenging aryl-alkyl acetylenes, proceeded smoothly with inexpensive, easily handled, and commercially available potassium persulfate and an ambient air balloon, achieving the corresponding 1,2-diketones with up
We report an electrochemical protocol for the direct oxidation of internal alkynes in air to provide 1,2-diketones. A variety of functional groups and heterocycle-containing substrates can be tolerated well under mild conditions.