Two new long-chain ceramides, trametenamides A (1) and B (2), were isolated from the methanolic extract of the fruiting body of the fungus Trametes menziesii. The structures were elucidated by spectroscopic analyses and chemical transformations, and the absolute stereochemistry of trametenamide B (2) was determined by stereoselective total synthesis of four possible diastereomers. The acetyl derivative
and B (1and 2, respectively), two new sphingolipids, have been isolated from the AcOEt-soluble sub-fraction of the MeOH extract of the whole plant of Abutilonpakistanicum. Their structures were assigned by 1H and 13C NMR spectra, and by DEPT and COSY, NOESY, HMQC, HMBC, EI-MS, and FAB-MS experiments. Graphical Abstract New Sphingolipids fromAbutilonpakistanicum
Two Cerebrosides and One Acylglycosyl Sterol from<i>Monochoria Vaginalis</i>
作者:Lie-Ching Row、Chiu-Ming Chen、Jiau-Ching Ho
DOI:10.1002/jccs.200300156
日期:2003.10
Three new compounds have been isolated from the whole plant of Monochoria vaginalis and characterized as: (2S,3R,4E,8E,2'R)-1-O-(β-D-glucopyranosyl)-N-(2'-hydroxyicosanoyl)-4,8-sphingadienine, (2S,3R,4E,8E,2'R)-1-O-(β-D-glucopyranosyl)-N-(2'-hydroxyoctadecanoyl)-4,8-sphingadienine and 7-oxo-stigmasteryl-3-O-(6'-hexadecanoyl)-β-D-glucopyranoside. Their structures were established by spectral and chemical