Synthesis of Calocybe indica var. APK2 polysaccharide repeating unit
作者:Lei Zhang、Xiangming Zhu
DOI:10.1016/j.carres.2014.04.004
日期:2014.6
The first total synthesis of p-methoxyphenyl alpha-L-fucopyranosyl-(1 -> 6)-alpha-D-galactopyranosyl-(1 -> 4)-beta-D-glucopyranosyl-(1 -> 6)-beta-D-glucopyranosyl-(1 -> 6)-beta-D-glucopyranoside (2) was achieved starting from five monosaccharide building blocks. This structure represents the repeating unit of the polysaccharide isolated from edible mushroom Calocybe indica var. APK2, and was synthesized in high overall yield via a convergent '3+ 2' glycosylation strategy. (C) 2014 Elsevier Ltd. All rights reserved.
Synthesis of oleanolic acid saponins mimicking components of Chinese folk medicine Di Wu
3,28-Di-O-rhamnosylated oleanolic acid saponins, mimicking components of Chinese folk medicine Di Wu, have been designed and synthesized. one-pot glycosylation and 'inverse procedure' technologies have been applied thus significantly simplifying the preparation of desired saponins. The cytotoxic activity of compounds 3-O-[alpha-L-rhamnopyranosyl-(1 -> 2)-beta-D-xylopyranosyl]oleanolic acid 28-O-[alpha-L-rhamnopyranosyl-(1 -> 4)-beta-D-glucopyranosyl-(1 -> 6)-beta-D-glucopyranosyl] ester (3), 3-O-[alpha-L-rhamnopyranosyl]oleanolic acid 28-O-[alpha-L-rhamnopyranosyl- (1 -> 4)-beta-D-glucopyranosyl-(1 -> 6)-beta-D-glucopyranosyl] ester (4), 3-O-[alpha-L-rhamnopyranosyl]oleanolic acid 28-O-[alpha-L-rhamnopyranosyl] ester (5), and 3-O-[alpha-L-rhamnopyranosyl]oleanolic acid 28-O-[6-O-(alpha-L-rhamnopyranosyl)hexyl] ester (6) was preliminarily evaluated against HL-60 human promyelocytic leukemia cells. The natural saponin 3 and designed saponin 4 exhibited comparable moderate cytotoxic activity under our testing conditions. (C) 2009 Elsevier Ltd. All rights reserved.