Palladium-Catalyzed Synthesis of 1,2-Diketones from Aryl Halides and Organoaluminum Reagents Using <i>tert</i>-Butyl Isocyanide as the CO Source
作者:Bo Chen、Xiao-Feng Wu
DOI:10.1021/acs.orglett.9b04414
日期:2020.1.17
In this work, an interesting and practical procedure for the synthesis of 1,2-diketonesfrom aryl halides and organoaluminum reagents has been developed. Employing tert-butyl isocyanide as the CO source and palladium as the catalyst, the desired 1,2-diketones were isolated in good to excellent yields with good functional group tolerance. Concerning the reaction partners, besides aryl halides, both
Iodine-Catalyzed Synthesis of 1,2-Diaryldiketones by Oxidative Cleavage of 1,3-Diaryldiketones with DMSO
作者:Yu Yuan、Haitao Zhu
DOI:10.1002/ejoc.201101028
日期:2012.1
A metal-free, efficient, practical, and convenient process based on an iodine-catalyzedoxidativecleavage reaction has been developed to form 1,2-diaryldiketons in high yields from 1,3-diaryldiketones. The reaction is performed in DMSO and in air, and a mechanism was proposed according to the reaction evidence.
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.
Photoredox Catalytic Phosphite‐Mediated Deoxygenation of α‐Diketones Enables Wolff Rearrangement and Staudinger Synthesis of β‐Lactams
作者:Hui Yang、Haijun Li、Guo Wei、Zhiyong Jiang
DOI:10.1002/anie.202107080
日期:2021.9
activation of C=O bonds by exploiting the photoredox chemistry of 1,3,2-dioxaphospholes, readily accessible fromα-diketones and trialkyl phosphites, is reported. This mild and environmentally friendly strategy provides an unprecedented and efficient access to the Wolff rearrangement reaction which traditionally entails α-diazoketones as precursors. The resulting ketenes could be precisely trapped by