The Claisen-Haase rearrangement of β-acyloxyacrylates, RC(O·COR′) : CH·CO2Et, into the isomeric diacylacetates, RCO·CH(COR′)·CO2Et, is subject to base and acid catalysis. The reaction is intermolecular when base-catalysed and probably intramolecular when acid-catalysed.
Design, Synthesis, and in Vitro Biological Evaluation of 1<i>H</i>-1,2,3-Triazole-4-carboxamide Derivatives as New Anti-influenza A Agents Targeting Virus Nucleoprotein
The influenza virus nucleoprotein (NP) is an emerging target for anti-influenza drug development. Nucleozin (1) and its closely related derivatives had been identified as NP inhibitors displaying anti-influenza activity. Utilizing 1 as a lead molecule, we successfully designed and synthesized a series of 1H-1,2,3-triazole-4-carboxamide derivatives as new anti-influenza A agents. One of the most potent compounds, 3b, inhibited the replication of various H3N2 and H1N1 influenza A virus strains with IC50 values ranging from 0.5 to 4.6 mu M. Compound 3b also strongly inhibited the replication of H5N1 (RG14), amantidine-resistant A/WSN/33 (H1N1), and oseltamivir-resistant A/WSN/1933 (H1N1, 274Y) virus strains with IC50 values in sub-mu M ranges. Further computational studies and mechanism investigation suggested that 3b might directly target influenza virus A nucleoprotein to inhibit its nuclear accumulation.
1112. Derivatives of 6-aminopenicillanic acid. Part VI. Penicillins from 3- and 5-phenylisoxazole-4-carboxylic acids and their alkyl and halogen derivatives
作者:F. P. Doyle、J. C. Hanson、A. A. W. Long、J. H. C. Nayler、E. R. Stove