A novel isoindoline, porritoxin sulfonic acid, from alternaria porri and the structure-phytotoxicity correlation of its related compounds

Abstract

Novel zinniol-related compound 3, named porritoxin sulfonic acid, with an isoindoline skeleton was isolated from the culture liquid of Alternaria porri. The structure was determined to be 2-(2″-sulfoethyl)-4-methoxy-5-methyl-6-(3′-methyl-2′-butenyloxy)-2,3-dihydro-1H-isoindol-1-one. The phytotoxic activities of three isoindolines (1-3) were evaluated in a seedling-growth assay against stone leek and lettuce. © 2003 by Japan Society for Bioscience, Biotechnology, and Agrochemistry.