Ruthenium-Catalyzed Redox-Neutral and Single-Step Amide Synthesis from Alcohol and Nitrile with Complete Atom Economy
摘要:
A completely atom-economical and redox-neutral catalytic amide synthesis from an alcohol and a nitrite is realized. The amide C-N bond is efficiently formed between the nitrogen atom of nitrile and the alpha-carbon of alcohol, with the help of an N-heterocyclic carbene-based ruthenium catalyst, without a single by-product. A utility of the reaction was demonstrated by synthesizing C-13 or N-15 isotope-labeled amides without involvement of any separate reduction and oxidation step.
N-Heterocyclic carbene-based well-defined ruthenium hydride complexes for direct amide synthesis from alcohols and amines under base-free conditions
作者:Kunsoon Kim、Byungjoon Kang、Soon Hyeok Hong
DOI:10.1016/j.tet.2015.02.016
日期:2015.7
carbene-based ruthenium(II) hydride complexes were developed for amidesynthesisfromalcohols and amines under base-free conditions. Diverse amides were synthesized in fair-to-excellent yields. In the case of secondary amines, where direct dehydrogenative amidation is not feasible, a catalytic amount of a base was required to promote the transamidation of esters, which are byproducts of alcohol dimerization
Structure−Activity Relationships of Cycloalkylamide Derivatives as Inhibitors of the Soluble Epoxide Hydrolase
作者:In-Hae Kim、Yong-Kyu Park、Bruce D. Hammock、Kosuke Nishi
DOI:10.1021/jm101431v
日期:2011.3.24
Structure-activity relationships of cycloalkylamide compounds as inhibitors of human sEH were investigated. When the left side of amide function was modified by a variety of cycloalkanes, at least a C6 like cyclohexane was necessary to yield reasonable inhibition potency on the target enzyme. In compounds with a smaller cycloalkane or with a polar group on the left side of amide function, no inhibition was observed. On the other hand, increased hydrophobicity dramatically improved inhibition potency. Especially, a tetrahydronaphthalene (20) effectively increased the potency. When a series of alkyl or aryl derivatives of cycloalkylamide were investigated to continuously optimize the right side of the amide pharmacophore, a benzyl moiety functionalized with a polar group produced highly potent inhibition. A nonsubstituted benzyl, alkyl, aryl, or biaryl structure present on the right side of the cycloalkylamide function induced a big decrease in inhibition potency. Also, the resulting potent cycloalkylamide (32) showed reasonable physical properties.