Efficient one-pot synthesis of tigogenin saponins and their antitumor activities
作者:Guofeng Gu、Lian An、Min Fang、Zhongwu Guo
DOI:10.1016/j.carres.2013.10.015
日期:2014.1
An efficient synthesis of naturally occurring tigogenin triglycoside 1a and its three derivatives 1b-d bearing different carbohydrate moieties, as well as their antitumor activities, is described. Partially protected thiogalactosides bearing unprotected 2,4-OH or 4-OH groups were used to facilitate regioselective reactions for one-pot sequential multi-step glycosylation, which has significantly simplified
[EN] SYNTHESIS OF TIMOSAPONIN BII<br/>[FR] SYNTHÈSE DE TIMOSAPONINE BII
申请人:PHYTOPHARM PLC
公开号:WO2009132478A1
公开(公告)日:2009-11-05
The invention provides a synthetic route from sarsasapogenin to timosaponin BII and related compounds.A diketone intermediate is provided, which can advantageously be used for in situ assembly of complex sugar moieties of the desired glycone end product. The diketone compound is then selectively reduced using a borohydride reducing agent to form the desired end product, certain of the end products and intermediates are novel compounds perse.
Total synthesis of a furostan saponin, timosaponin BII
作者:Shuihong Cheng、Yuguo Du、Baiping Ma、Dawei Tan
DOI:10.1039/b905091d
日期:——
The natural timosaponin BII, (25S)-26-O-β-D-glucopyranosyl-22-hydroxy-5β-furostane-3β,26-diol-3-O-β-D-glucopyranosyl-(1→2)-β-D-galactopyranoside, isolated from the rhizomes of Anemarrhena asphodeloides Bunge (Liliaceae), has been efficiently synthesized in ten steps and 18% overall yield. The strategy of using a partially protected glycosyl donor was applied to facilitate target synthesis. The cytotoxic activities of structurally related compounds were evaluated against HL-60 human promyelocytic leukaemia cells.
Provided herein are timosaponin compounds of Formula I, II, III, I′, II′ and III′, pharmaceutical compositions comprising the compounds, and processes of preparation thereof. Also provided are uses of said timosaponin compounds for preparing medicament for the treatment of diseases associated with beta-amyloid in hosts or subjects in need thereof.
Provided herein are timosaponin compounds of Formula I, II, III, I′, II′ and III′, pharmaceutical compositions comprising the compounds, and processes of preparation thereof. Also provided are uses of said timosaponin compounds for preparing medicament for the treatment of diseases associated with beta-amyloid in hosts or subjects in need thereof.