Synthesis of 1,4‐Dicarbonyl Compounds by Visible‐Light‐Mediated Cross‐Coupling Reactions of α‐Chlorocarbonyls and Enol Acetates
作者:Qiang Liu、Rui‐Guo Wang、Hong‐Jian Song、Yu‐Xiu Liu、Qing‐Min Wang
DOI:10.1002/adsc.202000791
日期:2020.10.21
visible‐light‐mediatedradical coupling reactions of α‐chloroketones and enol acetates to afford 1,4‐dicarbonyl compounds, which are important precursors and intermediates in organic synthesis. The reaction involves photoredox‐catalyzed activation of the α‐chloroketone upon photoelectron transfer, carbon–chlorine bond cleavage, and coupling of the resulting radical with the carbon–carbon double bond of the
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.
Highly efficient Cu(I)-catalyzed trifluoromethylation of aryl(heteroaryl) enol acetates with CF3 radicals derived from CF3SO2Na and TBHP at room temperature
An efficient method for the Cu(I)-catalyzed synthesis of α-trifluoromethyl ketones via the addition of CF3 to aryl(heteroaryl) enolacetates by using the readily available CF3SO2Na (Langlois reagent) has been developed. The reaction is experimentally simple and carried out at room temperature, providing good to excellent yields with wide functional group tolerance.
通过加入CF的对α-三氟甲基酮的铜(I)催化合成的有效方法3至芳基通过使用容易获得的CF(杂芳基)乙酸酯烯醇3 SO 2 Na(上兰洛伊斯试剂)已被开发。该反应是简单的实验,并在室温下进行,以优异的产率提供了良好的与宽官能团耐受性。
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