Lansioside A, a novel triterpene amino-sugar glycoside, is isolated from and its full structure including absolute configuration is established by the chemical derivation and spectral study.
Thermal glycosylation of alcohols with 2-deoxy-2-acetoamino-3,4,6-tri-O-acetyl-glucopyranosyl chloride at relatively lower temperature gives rise to beta-glycosides selectively, whereas higher temperature favor to give alpha-glycosides.
Structure of lansiosides: biologically active new triterpene glycosides from Lansium domesticum