Stryphnosides A-F, six new triterpene glycosides from the pericarps of Stryphnodendron fissuratum

Six new triterpene glycosides stryphnosides A-F (1-6) were isolated from the pericarps of Stryphnodendron fissuratum (Leguminosae). The structures of 1-6 were determined on the basis of extensive spectroscopic analysis, including two-dimensional (213) NMR data, and the results of hydrolytic cleavage. The sugar moieties of 3-6 are very unique in structure having not only novel sugar sequences but also the terminal alpha-L-arabinopyranosyl unit with a C-1(4) conformation. Stryphnosides C (3)-F (6) are the first representative of naturally occurring glycosides with the C-1(4) terminal alpha-L-arabinopyranosyl group. (c) 2007 Elsevier Ltd. All fights reserved.