Fungal metabolites. Part I. Stereochemical features and mass spectrometry of secalonic acids
Abstract
The mass spectra of secalonic acids A, C, D, E(B)(dimethyl 5,5′,6,6′,7,7′,10a,10a′-octahydro-1,1′ 5, 5′,8,8′-hexa-hydroxy-6,6′-dimethyl-9,9′-dioxo-2,2′-bixanthen-10a,10a′-dicarboxylates) show features closely related to the stereochemistry at the six chiral centres in these compounds. Analysis of the spectra suggests that the stereochemistry of any new secalonic acid could be defined largely by its mass spectrum.