ABSTRACT
From the deep-sea-derived fungus Aspergillus candidus, one novel (1) and three known (2-4) p-terphenyl derivates were isolated. The structure of the new compound was established mainly on the basis of extensive analysis of 1D and 2D NMR data. All four isolates were tested for in vitro anti-food allergic and antitumor bioactivities. Compounds 3 and 4 showed potent antiproliferative effect against four cancer cells of Hela, Eca-109, Bel-7402, and PANC-1 with IC50 values ranging from 5.5 µM to 9.4 µM.
Subject(s)
Aspergillus/chemistry , Oceans and Seas , Terphenyl Compounds/pharmacology , Antineoplastic Agents/pharmacology , Carbon-13 Magnetic Resonance Spectroscopy , Cell Death/drug effects , Cell Line, Tumor , Humans , Proton Magnetic Resonance Spectroscopy , Terphenyl Compounds/chemistry , Terphenyl Compounds/isolation & purificationABSTRACT
A one-step methodology for the synthesis of multisubstituted quinoline-4-carboxamides was developed by simply refluxing a mixture of isatins 1 and various kinds of 1,1-enediamines 2-4 in a reaction catalyzed by NH2SO3H. As a result, a series of quinolone-4-carboxamides were produced through a novel cascade reaction mechanism. This reaction involved the formation of the quinoline ring accompanied by the formation of an amide bond in one step. Accordingly, this protocol is suitable for combinatorial and parallel syntheses of quinolone-4-carboxamide drugs or natural products.
