Metabolites of the higher fungi. Part 33. Grammicin, a novel bicyclic C7H6O4 furanopyranol from the fungus Xylaria grammica (Mont.) Fr

摘要

Grammicin 1 from Xylaria grammica is identified as 4-hydroxy-4H-furo[2,3-b]pyran-2(7aH)-one by chemical andnphysical methods. 4-Oxo-4H-pyran-3-acetic acid (γ-pyrone-3-acetic acid) 2 is a co-metabolite and the conversion of 1ninto 2 is discussed.