4-Hydroxy-3-quinolinecarboxamides with antiarthritic and analgesic activities
作者:Francois Clemence、Odile Le Martret、Francoise Delevallee、Josette Benzoni、Alain Jouanen、Simone Jouquey、Michel Mouren、Roger Deraedt
DOI:10.1021/jm00402a034
日期:1988.7
by the oral route as antiinflammatory agents in carrageenin-induced foot edema and adjuvant-induced arthritis and as analgesic agents in the acetic acid induced writhing test. Among the most active molecules, some have shown both analgesic and acute antiinflammatory activities. Others, such as compounds 24, 37, and 52, were only powerful peripherally acting analgesics. Compound 52, being active at 1
Nucleophilic Acyl Substitution via Aromatic Cation Activation of Carboxylic Acids: Rapid Generation of Acid Chlorides under Mild Conditions
作者:David J. Hardee、Lyudmila Kovalchuke、Tristan H. Lambert
DOI:10.1021/ja101292a
日期:2010.4.14
occurs rapidly in the presence of 3,3-dichlorocyclopropenes via the intermediacy of cyclopropenium carboxylate complexes. The effect of cyclopropene substituents on the rate of conversion is examined. The addition of tertiaryamine base is found to dramatically accelerate reaction, and conditions were developed for the preparation of acid sensitive acid chlorides. Preparative scale peptide couplings of
Intramolecular Pd(II)-Catalyzed Cyclization of Propargylamides: Straightforward Synthesis of 5-Oxazolecarbaldehydes
作者:Egle M. Beccalli、Elena Borsini、Gianluigi Broggini、Giovanni Palmisano、Silvia Sottocornola
DOI:10.1021/jo800621n
日期:2008.6.1
Direct synthesis of 2-substituted 5-oxazolecarbaldehydes was performed by intramolecular reaction of propargylamides through treatment with a catalytic amount of Pd(II) salts in the presence of a stoichiometric amount of reoxidant agent. The heterocyclization process was well-tolerated by a wide range of aryl, heteroaryl, and alkyl propargylamides. This protocol constitutes a valuable synthetic pathway to 5-oxazolecarbaldehydes, alternative to the formylation on oxazole rings, often unsatisfactory in term of regioselectivity and yields.