Fluorine-containing Heterocycles: X. Acetoacetamides in the Synthesis of Fluorine-containing Chromone
摘要:
Fluorine-containing chromone-3-carboxamides were synthesized by reaction of tetra(penta)fluorobenzoyl chlorides with acetoacetamides in dichloromethane in the presence of triethylamine. Nucleophilic substitution of fluorine atoms by amine rests in compounds synthesized was investigated.
Copper‐Catalyzed Mild Nitration of Protected Anilines
作者:Elier Hernando、Rafael R. Castillo、Nuria Rodríguez、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1002/chem.201404000
日期:2014.10.20
A practical copper‐catalyzed direct nitration of protected anilines, by using one equivalent of nitric acid as the nitrating agent, has been developed. This procedure features mild reaction conditions, wide structural scope (with regard to both N‐protecting group and arene substitution), and high functional‐group tolerance. Dinitration with two equivalents of nitric acid is also feasible.
compounds. The conformational ratio of these compounds in solution was correlated linearly with Hammett’s σp value of the substituent on the anilide ring, reflecting the repulsive interaction between the carbonyl group and the electron-rich aryl group. The addition of acid into the solution of 6, bearing pentafluorobenzoyl group, switched the stable amide conformation. In addition, the sizeable rotational
基于酰胺的分子开关在结构多样性上有其局限性。在这项工作中,我们设计并合成了一系列基于五氟苯甲酰基的苯甲酰苯胺化合物。这些化合物在溶液中的构象比与苯胺环上取代基的Hammett σ p值线性相关,反映了羰基和富电子芳基之间的排斥相互作用。在带有五氟苯甲酰基的6溶液中加入酸,改变了稳定的酰胺构象。此外,由五氟苯甲酰基部分诱导的6的相当大的旋转屏障使我们能够通过1 H NMR 光谱监测构象转变。
Hydrogen Bond Directed Photocatalytic Hydrodefluorination: Overcoming Electronic Control
作者:Mohammad B. Khaled、Roukaya K. El Mokadem、Jimmie D. Weaver
DOI:10.1021/jacs.7b06847
日期:2017.9.20
photocatalytic C–F functionalization of highly fluorinated arenes is a powerful method for accessing functionalized multifluorinated arenes. The decisive step in the determining regioselectivity in fluorine functionalization is fluoride fragmentation from the radical anion of the multifluorinated arene. To date, the availability of regioisomers has been dictated by the innate electronics of the fluorinated arene
Fluorine-containing Heterocycles: X. Acetoacetamides in the Synthesis of Fluorine-containing Chromone
作者:G. N. Lipunova、E. V. Nosova、M. I. Kodess、V.N. Charushin
DOI:10.1023/b:rujo.0000045899.90635.62
日期:2004.8
Fluorine-containing chromone-3-carboxamides were synthesized by reaction of tetra(penta)fluorobenzoyl chlorides with acetoacetamides in dichloromethane in the presence of triethylamine. Nucleophilic substitution of fluorine atoms by amine rests in compounds synthesized was investigated.