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8 hasil
Synthesis and anti-tumour, immunomodulating activity of diosgenin and tigogenin conjugates.
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A series of novel diosgenin (DSG) and tigogenin (TGG) derivatives with diosgenin or tigogenin steroid aglycons linked to levulinic and 3,4-dihydroxycinnamic acids, dipeptides and various amino acids by an ester bond at the C3-oxygen atom of the steroid skeleton has been synthesized. Diosgenyl esters
Efficient one-pot synthesis of tigogenin saponins and their antitumor activities.
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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
Synthesis of tigogenin MeON-Neoglycosides and their antitumor activity.
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To discover new potent cytotoxic steroidal saponins, a series of tigogenin neoglycosides were synthesized via oxyamine neoglycosylation for the first time. The preliminary bioassays for their in vitro antitumor activities against five human cancer cell lines (A375, A-549, HCT-116, HepG2 and MCF-7)
Steroidal saponins from Hosta longipes and their inhibitory activity on tumour promoter-induced phospholipid metabolism of HeLa cells.
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Three new spirostanol saponins and two new furostanol saponins were isolated from the underground parts of Hosta longipes. Their structures were determined to be (25R)-5 alpha-spirostane-2 alpha, 3 beta-diol (gitogenin) 3-O-{O-alpha-L -rhamnopyranosyl-(1-->2)-beta-D-galactopyranoside}, gitogenin
New steroidal alkaloid and furostanol glycosides isolated from Solanum lyratum with cytotoxicity.
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Two previously undescribed steroidal compounds, 16, 23-epoxy-22, 26-epimino-cholest-22(N), 23, 25(26)-trien-3β-ol-3-O-β-D-glucopyranosyl-(1→2)-β-D-glucopyranosyl-(1→4)-β-D-galactopyranoside (1) and 26-O-β-D-glucopyranosyl-(25R)-5α-furost-20(22)-en-3β, 26-diol (2), together with 7 known ones
Novel chemical library screen identifies naturally occurring plant products that specifically disrupt glioblastoma-endothelial cell interactions.
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Tumor growth is not solely a consequence of autonomous tumor cell properties. Rather, tumor cells act upon and are acted upon by their microenvironment. It is tumor tissue biology that ultimately determines tumor growth. Thus, we developed a compound library screen for agents that could block
First synthesis of 3,16,20-polyoxygenated cholestanes, new cytotoxic steroids from the gorgonian Leptogorgia sarmentosa.
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Using tigogenin as starting material, (20S)-20-hydroxycholestane-3,6-dione (1), (16S, 20S)-16,20-dihydroxycholestan-3-one (2), (20S)-20-hydroxycholest-1-ene-3,16-dione (3) and (20S)-20-hydroxycholest-4-ene-3,16-dione (4), natural polyoxygenated steroids from the gorgonian, Leptogorgia sarmentosa,
[Chemical constituents from herb of Solanum lyratum].
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OBJECTIVE
To study the chemical constituents of Solanum lyratum, And to explore the anti-tumor effect of some steroidal compounds from it.
METHODS
The chemical constituents were isolated and purified via silica gel and Sephadex LH-20 column chromatography as well as recrystallization. Their
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