Studies on fungal metabolites. Part 3. 13C N.m.r. spectral and structural studies on austin and new related meroterpenoids from Aspergillus ustus, Aspergillus variecolor, and Penicillium diversum

Abstract

The ¹³C n.m.r, spectrum of austin has been fully assigned by inter alia analysis of long range ¹H–¹³C couplings in the fully ¹H-coupled ¹³C n.m.r. spectrum. Further related metabolites, dehydroaustin, austinol, and isoaustin, have been isolated from Aspergillus ustus, Aspergillus variecolor, and Penicillium diversum. Their structures have been assigned by detailed analysis of their ¹H and ¹³C n.m.r. spectra.