Induced Isoflavonoids from Fungus-Infected Stems of Pigeon Pea (Cajanus cajan)

Abstract

Four antifungal isoflavones [7-hydroxy-4'-methoxy-(1); 5, 7, 4'-trihydroxy-(2); 5, 7, 2', 4'-tetra-hydroxy-(3); 5, 2', 4'-trihydroxy-7-methoxy-(4)] and one isoflavanone [(5, 2'-dihydroxy-7, 4'-dimethoxy-(7)] have been isolated from the fungus-infected stems of Cajanus cajan. A sixth compound has been provisionally identified as 5, 2'-dihydroxy-7, 4'-dimethoxyisoflavone (5). The structure of 5, 2'-dihydroxy-7, 4'-dimethoxyisoflavanone (cajanol) was confirmed by synthesis from ferreirin (5, 7, 2'-trihydroxy-4'-methoxyisoflavanone). © 1976, Verlag der Zeitschrift für Naturforschung. All rights reserved.