Selective cine Substitution of 1-Arylethenyl Acetates with Arylboron Reagents and a Diene/Rhodium Catalyst
作者:Jung-Yi Yu、Ryosuke Shimizu、Ryoichi Kuwano
DOI:10.1002/anie.201002745
日期:2010.8.23
When the crowd says Bo: A carbon–carbon bond is selectively formed at the β position of 1‐arylethenyl acetate when the alkenyl substrate is reacted with arylboronic acids in the presence of a cycloocta‐1,5‐diene/rhodiumcatalyst. The choice of the ligand is crucial for the unusual cinesubstitution.
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。
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.
Catalyst‐Free and Oxidant‐Free Cascade Difluoroalkylation and Controllable C−F Bond Activation of Aryl Enol Acetates for the Synthesis of β‐Fluoroenones and β‐Enaminones
作者:Wenshuang Li、Ruyan Liu、Ruonan Li、Shihaozhi Wang、Dianjun Li、Jinhui Yang
DOI:10.1002/adsc.202100681
日期:2021.12.7
Arylenolacetates and DMF could promote radical difluoroalkylation of arylenolacetates to generate α,α-difluoro-γ-ketoacetates without a catalyst, an oxidant, or a base. When using different bases, β-fluoroenones and β-enaminones were synthesized by controllableC−Fbondactivation. These transformations provide an alternative method for the cascadedifluoroalkylation and C−F bonds activation of