Concise synthesis of two natural triterpenoid saponins, oleanolic acid derivatives isolated from the roots of Pulsatilla chinensis
摘要:
The first synthesis of two natural triterpenoid saponins, which were isolated from the roots of Pulsatilla chinensis and exhibited excellent in vitro cytotoxic activity against HL-60 cells, was concisely achieved in a convergent approach. We employed an odourless 2-methyl-5-tert-butylphenyl (Mbp) thioglycoside and trichloroacetimidate donors in one-pot reaction as a key step. (C) 2009 Published by Elsevier Ltd.
Synthesis and immunomodulatory activity of the sulfated tetrasaccharide motif of type B ulvanobiuronic acid 3-sulfate
作者:Liangliang Zhang、Xiaotong Wang、Qingting Hua、Junchang Wang、Jianwen Liu、You Yang
DOI:10.1039/d0ob01852j
日期:——
we performed the first efficient synthesis of the unique sulfated tetrasaccharide motif of type B ulvanobiuronic acid 3-sulfate. Based on the gold(I)-catalyzed glycosylation with glycosyl ynenoates as donors, efficientconstruction of the challenging α-(1 → 4)-glycosidic bonds between iduronic acid and rhamnose building blocks was achieved to afford the tetrasaccharide skeleton in a stereospecific manner
Ulvan 是一种来自绿藻的硫酸化多糖,具有有效的抗肿瘤、抗病毒和免疫调节活性。然而,迄今为止没有报道过绿藻糖的化学合成。在本文中,我们首次有效合成了 B 型 ulvanobiuronic 酸 3-硫酸盐的独特硫酸化四糖基序。基于金 ( I ) 催化的糖基化,以糖基 ynenoates 作为供体,实现了艾杜糖醛酸和鼠李糖结构单元之间具有挑战性的 α-(1 → 4)-糖苷键的有效构建,从而以立体特异性的方式提供了四糖骨架。发现合成的硫酸化四糖显着提高巨噬细胞RAW264.7细胞的吞噬活性。
Concise synthesis of two natural triterpenoid saponins, oleanolic acid derivatives isolated from the roots of Pulsatilla chinensis
作者:Qingchao Liu、Peng Wang、Lei Zhang、Tiantian Guo、Guokai Lv、Yingxia Li
DOI:10.1016/j.carres.2009.05.011
日期:2009.7
The first synthesis of two natural triterpenoid saponins, which were isolated from the roots of Pulsatilla chinensis and exhibited excellent in vitro cytotoxic activity against HL-60 cells, was concisely achieved in a convergent approach. We employed an odourless 2-methyl-5-tert-butylphenyl (Mbp) thioglycoside and trichloroacetimidate donors in one-pot reaction as a key step. (C) 2009 Published by Elsevier Ltd.