Minor anthraquinonoid metabolites of Cercosporaarachidicola

Abstract

Minor metabolites of the fungus Cercosporaarachidicola have been identified as the known pigments versicolorin B (3), averantin (4), and nidurufin (2b) and the new, but closely related compounds 4′-deoxydothistromin (1b), 3′,4′-dehydro-4′-deoxydothistromin (5a), and 4′,5-bisdeoxydothistromin (1d). The ¹H and ¹³Cmr spectra of 1d, 2b, and the tetracetates 1c and 5b are presented in detail. Biosynthetic and chemotaxonomic aspects are discussed.