Direct C(sp3)-Hfunctionalization of alkylnitriles is a low toxic and facile route to nitrile-containing compounds. In this research, the Ag2CO3-mediated nitrile methylenation of enol acetates is developed to prepare γ-ketonitriles through the direct C(sp3)-Hoxidativefunctionalization of acetonitrile. A radical pathway is proposed, and acetonitrile serves both as solvent and CN-containing radical
烷基腈的直接C(sp3)-H官能化是向含腈化合物的低毒易制毒途径。在这项研究中,开发了通过乙腈的直接C(sp 3)-H氧化功能化,由Ag 2 CO 3介导的烯醇乙酸盐腈腈甲基化反应,以制备γ-酮腈。提出了一种自由基途径,乙腈既是溶剂又是含CN的自由基源。
Visible-Light-Promoted Synthesis of α-CF<sub>2</sub>H-Substituted Ketones by Radical Difluoromethylation of Enol Acetates
An efficient and novel visible-light-promoted radical difluoromethylation of enol acetates for the synthesis of α-CF2H-substituted ketones has been described. Upon irradiation under blue LED with catalytic amounts of fac-Ir(ppy)3, this photocatalytic procedure employs difluoromethyltriphenylphosphonium bromide as a radical precursor. Various α-CF2H-substituted ketones are successfully created via designed
Ir(ppy)<sub>3</sub>-Catalyzed, Visible-Light-Mediated Reaction of α-Chloro Cinnamates with Enol Acetates: An Apparent Halogen Paradox
作者:Thomas Föll、Julia Rehbein、Oliver Reiser
DOI:10.1021/acs.orglett.8b02484
日期:2018.9.21
activation of vinyl chloridesderivedfrom α-chloro ethyl cinnamates via oxidative quenching of excited photocatalyst fac-Ir(ppy)3 is described. Upon photoelectron transfer and chloride extrusion, the corresponding vinyl radical can be efficiently trapped by enol acetates, giving rise to synthetically useful 1,4-dicarbonyl compounds in good to excellent yields. This transformation is distinguished by
Reductive Alkylation of Alkenyl Acetates with Alkyl Bromides by Nickel Catalysis
作者:Rong‐De He、Yunfei Bai、Guan‐Yu Han、Zhen‐Zhen Zhao、Xiaobo Pang、Xiaobo Pan、Xue‐Yuan Liu、Xing‐Zhong Shu
DOI:10.1002/anie.202114556
日期:2022.1.21
A new C−C bond-forming reaction between alkenyl acetates and alkyl bromides was achieved by reductive nickel catalysis. This method offers very mild reaction conditions for facile and precise synthesis of structurally versatile aliphatic alkenes using readily available and stable alkenyl reagents. It allows for a gram-scale reaction and modification of biologically active molecules, and it affords
Synthesis of β-CF3 Ketones through Copper/Silver Cocatalyzed Oxidative Coupling of Enol Acetates with ICH2CF3
作者:Wei Deng、Jiannan Xiang、Niannian Yi、Yi Xiong、De Chen、Sheng Zeng、Chaozhihui Cheng、Pengjie Wang
DOI:10.1055/s-0037-1610257
日期:2018.10
A simple method for the synthesis of β-CF3 ketones through copper/silver cocatalyzed oxidative coupling of enol acetates with ICH2CF3 has been developed. Enol acetates were chosen as the source of carbonyl group, giving the β-CF3 ketones in moderate yields. Control experiments imply that a radical process maybe involved in this reaction.