Stereochemistry of 16a-Hydroxyfriedelin and 3-Oxo-16-methylfriedel-16-ene Established by 2D NMR Spectroscopy
作者:Lucienir Pains Duarte、Roqueline Rodrigues Silva de Miranda、Salomão Bento Vasconcelos Rodrigues Rodrigues、Grácia Divina De Fátima Silva、Sidney Augusto Vieira Filho、Vagner Fernandes Knupp
DOI:10.3390/molecules14020598
日期:——
followed by a Nametkin rearrangement of a pentacyclic triterpene in CDCl3 solution occurring in the NMR tube. These seven pentacyclic triterpenes was identified through NMR spectroscopy and the stereochemistry of compound 4 and 7 was established by 2D NMR (NOESY) spectroscopy and mass spectrometry (GC-MS). It is also the first time that all the 13C-NMR and 2D NMR spectral data are reported for compounds