RESUMEN
A new furofuran lignan, zanthonin (1) together with 13 known compounds including seven furofuran lignans (2-8), one isobutyl amide (9), a furanocoumarin (10) and four flavonoids (11-14) have been isolated from the leaves of Zanthoxylum armatum. The chemical structures of these compounds were elucidated mainly on the basis of NMR (ID and 2D) and MS data. This is the first report on the isolation of methylxanthoxylol (4) from Z. armatum.
Asunto(s)
Lignanos/química , Hojas de la Planta/química , Zanthoxylum/química , Cumarinas/química , Flavonoides/química , Lignanos/aislamiento & purificación , Espectroscopía de Resonancia Magnética , Espectrometría de Masas , Estructura Molecular , Espectrometría de Masa por Ionización de Electrospray , Zanthoxylum/crecimiento & desarrolloRESUMEN
Vasicine, an abundantly available quinazoline alkaloid from the leaves of Adhatoda vasica, has been successfully employed for metal- and base-free reduction of nitroarenes to the corresponding anilines in water. The method is chemoselective and tolerates a wide range of reducible functional groups, such as ketones, nitriles, esters, halogens, and heterocyclic rings. Dinitroarenes reduced selectively to the corresponding nitroanilines under the present reaction conditions.