Abstract
The constitution of secalosides A and B was elucidated through NMR spectroscopy using fast 2D-NMR experiments with pulsed-field gradients for coherence selection. Secalosides A and B are epimers at center C-3‘ of aglycon I and have the constitution shown as 1. The presence of a saccharose unit was confirmed independently by mild basic hydrolysis and enzymatic quantification. The relative configuration of the stereogenic centers of aglycon II could be deduced from ROESY data. Assignments of the two epimers to the R- and S- configurations at C-3‘ in aglycon I, as well as the absolute configuration of aglycon II remain to be determined.
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