Author/Authors :
Piacente، نويسنده , , Sonia and Bifulco، نويسنده , , Giuseppe and Pizza، نويسنده , , Cosimo and Stochmal، نويسنده , , Anna and Oleszek، نويسنده , , Wieslaw، نويسنده ,
Abstract :
A new, very unusual, phenolic constituent based on a spiro benzopyran-4-cyclopentan-3-one system has been isolated from Yucca schidigera bark and its structure has been established by ESI-MS and NMR experiments. In particular the relative configuration of the molecule has been defined combining the NMR data with ab initio conformational studies; the minimum energy conformers for the eight possible diastereomers were compared to the NMR experimental data in order to assess the diastereomer fitting of all the J coupling values and the dipolar values.
