Efficient Synthesis of Functionalized Pyrido[2,3-c]coumarin Derivatives by a One-Pot Three-Component Reaction
作者:Zhiwei Chen、Lele Hu、Fei Peng
DOI:10.1055/s-0035-1561610
日期:——
promoted three-component reaction has been developed for the synthesis of functionalized pyrido[2,3- c ]coumarin derivatives from ketones, aromatic aldehydes, and 3-aminocoumarin. In this simple and efficient protocol, products were obtained in moderate to good yields (28 examples). The reaction proceeds by an asynchronous [4+2] cycloaddition (inverse-electron-demand Diels–Alder reaction).
Synthesis and Anti-Inflammatory Activity of 3-(Benzylideneamino)Coumarins in Rodents
作者:Veeresh Maddi、Kallur S. Raghu、M.N.A. Rao
DOI:10.1002/jps.2600810926
日期:1992.9
A series of substituted 3-(benzylideneamino) coumarins was synthesized and evaluated for anti-inflammatoryactivity against carrageenan-induced edema in rats. Halogenated derivatives 4g and 4c, at oral doses of 100 mg/kg, showed 75 and 60% antiedmatous activity, respectively (phenylbutazone antiedematous activity, 58%). The analgesic activity of 4g and 4c, based on inhibition of acetic acid-induced
Exploration of C5–C6-Unsubstituted 1,4-Dihydropyridines for the Construction of exo-Hexahydro-1H-chromeno[3,4-h][1,6]naphthyridine-3-carboxylates Using a Stereoselective Povarov Reaction
作者:Abu Khan、Kobirul Islam、Deb Das、Ejaz Akram
DOI:10.1055/s-0034-1380431
日期:——
A wide variety of substituted exo-hexahydro-1H-chromeno[3,4-h][1,6]naphthyridine-3-carboxylate derivatives have been synthesized from 3-aminocoumarins, aldehydes, and 5,6-unsubstituted 1,4-dihydropyridine derivatives in the presence of 10 mol% of ytterbium(III) triflate in acetonitrile at room temperature using a one-pot Povarov reaction. Some of the salient features of this protocol are: good yields and no need for an aqueous workup procedure or chromatographic separation.