An efficient method for the construction of polysubstituted 4-pyridones via self-condensation of β-keto amides mediated by P<sub>2</sub>O<sub>5</sub> and catalyzed by zinc bromide
作者:Liquan Tan、Peng Zhou、Cui Chen、Weibing Liu
DOI:10.3762/bjoc.9.304
日期:——
is presented for the synthesis of polysubstituted 4-pyridones and 2-pyridones from beta-keto amides. A variety of beta-keto amides are used in this approach, and a wide range of functionalized 4-pyridones and 2-pyridones were obtained in good to excellent yields. When employing the N-aryl beta-keto amides as the substrates in this protocol, 4-pyridones are resulted, however, when using N-aliphatic-substituted
Preparation and antiinflammatory activity of 2- and 4-pyridones
作者:James Benjamin Pierce、Zaven S. Ariyan、Gaye Stuart Ovenden
DOI:10.1021/jm00344a008
日期:1982.2
been self-condensed to form pyridones. N-Alkylacetoacetamides give 2-pyridones, while N-arylacetoacetamides give 4-pyridones. In an attempt to develop nonacidic, nonsteroidal antiinflammatory agents, the pyridones were tested in a carrageenan-induced pedal edema assay in rats. While the 2-pyridones were not active, 9 of 17 4-pyridones tested were active, and one compound (4g) had antiinflammatory efficacy
Mediated by sodium persulfate (Na(2)S(2)0(8)), a series of polysubstituted 4-pyridones were synthesized via self-condensation of N-aryl acetoacetamides, during which a novel N to C 1,3-acyl migration should be involved. The structure of 4-pyridone was unequivocally confirmed by X-ray diffraction analysis. However, the self-condensation of N-benzyl acetoacetamides under the same condition gave polysubstituted 2-pyridones instead of 4-pyridones.
Syntheses of 5-(Alkylaminocarbonyl)-4,6-dimethyl-2-pyridones from N-Alkyl-3-oxobutanamides
Bivalent ligands can engage homodimeric protein targets with high affinity due to avidity effects. This study shows that compounds conjugated to a masked formyl acetamide can be coupled efficiently and conveniently through trifluoroacetic acid (TFA)-catalyzed pyridone formation. In most cases, the product is produced in nearly quantitative yield and in excellent purity. The reaction is tolerant of