A facile and effective approach for the synthesis of 4-arylidene-2-phenyl-5(4H)-oxazolones has been developed. Under solvent-assisted grinding in the presence of 2,4,6-trichloro-1,3,5-triazine, catalytic triphenylphosphine, and sodium carbonate, dehydration–condensation of hippuric acid with aromatic aldehydes proceeded rapidly within minutes at room temperature to afford the products in good to excellent
Synthesis and Anticholinesterase Activity of [(4Z)-2-Aryl-4-(arylmethylidene)-5-oxo-4,5-dihydro-1H-imidazol-1-yl]alkanoic Acids
作者:V. O. Topuzyan、V. M. Kazoyan、R. A. Tamazyan、A. G. Aivazyan、L. Kh. Galstyan
DOI:10.1134/s1070428018090178
日期:2018.9
ω-[(4Z)-2-Aryl-4-arylmethylidene-5-oxo-4,5-dihydro-1H-imidazol-1-yl]alkanoic acids were synthesized by reaction of N-substituted α,β-dehydropeptides with chloro(trimethyl)silane or 1,1,1,3,3,3-hexamethyldisilazane. Both initial peptides and (4H)-imidazol-5-one derivatives based thereon were tested for anticholinesteraseactivity.
Palladium-Catalyzed Diastereo- and Enantioselective Formal [3 + 2]-Cycloadditions of Substituted Vinylcyclopropanes
作者:Barry M. Trost、Patrick J. Morris、Simon J. Sprague
DOI:10.1021/ja309003x
日期:2012.10.24
We describe a palladium-catalyzeddiastereo- and enantioselectiveformal [3 + 2]-cycloaddition between substituted vinylcyclopropanes and electron-deficient olefins in the form of azlactone- and Meldrum's acid alkylidenes to give highly substitutedcyclopentane products. By modulation of the electronic properties of the vinylcyclopropane and the electron-deficient olefin, high levels of stereoselectivity
Hepatitis C (HCV) infection is a cause of chronic liver disease such as cirrhosis, carcinoma, or liver failure, and the current therapy is effective in only 50% of patients. Serine proteases, which are present in HCV, are the most studied class of proteolytic enzymes, and are a primary target in the drug development field. In this paper, we describe the synthesis and biological studies of a novel class of peptide mimetic compounds as potential HCV serine protease inhibitors.
Chemoselective Reduction of Azlactones Using Schwartz’s Reagent
作者:Danielle L. J. Pinheiro、Eloah P. Ávila、Gabriel M. F. Batista、Giovanni W. Amarante
DOI:10.1021/acs.joc.7b00820
日期:2017.6.2
Highly chemoselective addition of Schwartz’s reagent to widely available azlactones is described. This method allows the preparation of challenged functionalized α-amino aldehydes, in good to high isolated yields at room temperature, after only 2 min reaction. The presence of sensitive functionalities or electronic factors does not compromise the potential of the method. The use of an excess of the