Synthesis of the pentasaccharide repeating unit of latosillan
摘要:
A pentasaccharide, beta-D-Man-(1 -> 2)-[beta-D-GlcNAc-(1 -> 4)]-alpha-L-Rha-(1 -> 4)-alpha-L-Rha-(1 -> 4)-alpha-L-Rha-1-OC8H17, representing the repeating unit of latosillan, was convergently synthesized from the building blocks, ethyl 2,3-O-isopropylidene-1-thio-alpha-L-rhamnopyranoside, 2-O-acetyl-3,4,6-tri-O-belizyl-beta-D-glucopyranosyl trichloroacetimidate, and 3,4,6-tri-O-acetyl-2-deoxy-2phthalimido-beta-D-glueopyranosyl trichloroacetimidate under standard glycosylation conditions. The target pentasaccharide showed acceptable differentiation-inducing activity on HL-60 cell lines at the dosages of 10-50 mu g/mL. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis and biological evaluation of acylated oligorhamnoside derivatives structurally related to mezzettiaside-6 with cytotoxic activity
作者:Gaopeng Song、Sumei Li、Zhiwei Lei、Yibin Li、Junhua Li、Yixian Liao、Zi-Ning Cui
DOI:10.1039/c6ob00862c
日期:——
Two partially acylated oligorhamnoside derivatives 1 and 2 structurallyrelated to the natural product mezzettiaside-6 were synthesized via a ‘2 + 1 + 1’ convergent strategy. The bioassay results showed that the introduction of the acetyl groups to the 2-position of the terminal L-rhamnose was helpful to improve in vitro cytotoxicity. Compound 1 showed both extensive in vitro cytotoxicity in tumor