Structures of virescenosides D and H, new metabolites of Acremonium luzulae(Fuckel) Gams
Abstract
Two new metabolites, virescenosides D (3a) and H (4a), isolated from the fungus Acremonium luzulae(Fuckel) Gams, are shown to be the 4-deoxy-β-D-threo-hex-4-enodialdopyranoside and the 4-deoxy-β-D-threo-hex-4-enopyranoside of virescenol B (5b), respectively, on the basis of chemical and spectral evidence and, particularly, their partial synthesis from the known virescenoside B (1b).