Highly selective catalytic Friedel–Crafts acylation and sulfonylation of activated aromatic compounds using indium metal
作者:Doo Ok Jang、Kyung Soo Moon、Dae Hyan Cho、Joong-Gon Kim
DOI:10.1016/j.tetlet.2006.06.099
日期:2006.8
Friedel–Crafts acylation of activated benzenes with various aromatic and aliphatic acid chlorides was studied in the presence of indium metal. The reaction was accomplished in high isolated yields under solvent or solvent-less conditions. The method is also applicable for preparing diaryl sulfones from aromatic compounds and aryl sulfonylchlorides.
Pd-Catalyzed CH Oxygenation with TFA/TFAA: Expedient Access to Oxygen-Containing Heterocycles and Late-Stage Drug Modification
作者:Gang Shan、Xinglin Yang、Linlin Ma、Yu Rao
DOI:10.1002/anie.201207458
日期:2012.12.21
Acid brings the oxygen: A generalmethod for palladium‐catalyzed CH oxygenation has been developed for the facilesynthesis of a wide range of functionalized phenols with readily available aryl ketones, benzoates, benzamides, acetanilides, and sulfonamides. A trifluoroacetic acid/trifluoroacetic acid anhydride solvent system serves as the oxygen source and is the critical factor for CH activation
Pd(II)-Catalyzed Direct <i>ortho</i>-C–H Acylation of Aromatic Ketones by Oxidative Decarboxylation of α-Oxocarboxylic Acids
作者:Pui-Yiu Lee、Peiwen Liang、Wing-Yiu Yu
DOI:10.1021/acs.orglett.7b00677
日期:2017.4.21
A Pd-catalyzed decarboxylative acylation of aromaticketones with α-oxocarboxylic acids was developed, and 1,2-diacylbenzenes were formed in up to 90% yield with excellent ortho-selectivity. This work demonstrates the first successful attempt to direct C–H acylation of aromaticketones without the need for prederivatization to imines. The acylation reaction was inhibited by radical scavengers such
Electrochemical [4+2] Annulation‐Rearrangement‐Aromatization of Styrenes: Synthesis of Naphthalene Derivatives
作者:Yueyue Ma、Jufeng Lv、Chengyu Liu、Xiantong Yao、Guoming Yan、Wei Yu、Jinxing Ye
DOI:10.1002/anie.201902315
日期:2019.5.13
We report the first electrochemical strategy to synthesize functionalized naphthalene derivatives through [4+2] annulation—rearrangement–aromatization from styrenes under mild conditions. The electrolysis does not require metals, oxidants and high valence substrates, indicating the atom and step‐economy ideals. The dehydrodimer produced through [4+2] cycloaddition of 4‐methoxy α‐methyl styrene is isolated
1,3‐Alkyl Transposition in Allylic Alcohols Enabled by Proton‐Coupled Electron Transfer
作者:Kuo Zhao、Gesa Seidler、Robert R. Knowles
DOI:10.1002/anie.202105285
日期:2021.9.6
for the isomerization of acyclic allylic alcohols into β-functionalized ketones via 1,3-alkyl transposition. This reaction proceeds via light-driven proton-coupled electron transfer (PCET) activation of the O−H bond in the allylic alcohol substrate, followed by C−C β-scission of the resulting alkoxy radical. The transient alkyl radical and enone acceptor generated in the scission event subsequently