480-44-4Relevant articles and documents
Structure determination and quantification of a new flavone glycoside with anti-acetylcholinesterase activity from the herbs of Elsholtzia ciliata
Nugroho, Agung,Park, Jong-Hyuk,Choi, Jae Sue,Park, Kyoung-Sik,Hong, Joon-Pyo,Park, Hee-Juhn
, p. 1 - 8 (2017)
Three acacetin triglycosides (compounds 1, 2 and 3) were isolated from the herbs of Elsholtzia ciliata (Labiatae). The structure were identified as 7-O-β-D-glucopyranosyl-(1?→?2)[α-L-rhamnopyranosyl-(1?→?6)]-β-D-glucopyranoside (compound 1), 7-O-(6-O-acetyl)-β-D-glucopyranosyl-(1?→?2)[α-L-rhamnopyranosyl-(1?→?6)]-β-D-glucopyranoside (compound 2) and 7-O-(6-O-acetyl)-β-D-glucopyranosyl-(1?→?2)[(4-O-acetyl)-α-L-rhamnopyranosyl-(1?→?6)]-β-D-glucopyranoside (compound 3) of acacetin. The structures of these compounds were determined on the basis of 2D-NMR spectroscopic data. Compound 3 has not been isolated from a natural source. In addition, the three compounds were quantitatively analysed by HPLC. Acetylcholinesterase (AChE) inhibition activity was assayed to find anti-Alzheimer’s activity, since this enzyme increases the concentration of acetylcholine (ACh), a neurotransmitter, responsible for brain’s memory. Acacetin, the aglycone of the three compounds, exhibited a potent anti-cholinesterase activity (IC50, 50.33?±?0.87), though its glycosides (1, 2 and 3) were less active. HPLC analysis demonstrated that the three compounds were contained in the MeOH extract in the order of compounds 2 (12.63?mg/g extract) > 3 (3.10?mg/g) > 1 (2.92?mg/g).
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Shelyuto et al.
, (1972)
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Anti-inflammatory activity of flavonoids from Chrozophora tinctoria
Abdallah, Hossam M.,Almowallad, Fahad M.,Esmat, Ahmed,Shehata, Ibrahim A.,Abdel-Sattar, Essam A.
, p. 74 - 80 (2015)
Abstract Chemical investigation of Chrozophora tinctoria (L.) A. Juss. growing in Saudi Arabia revealed the isolation of two new acylated flavonoids identified as acacetin-7-O-β-d-[α-l-rhamnosyl(1 → 6)]3″-E-p-coumaroyl glucopyranoside (4) and apigenin-7-O-(6″-Z-p-coumaroyl)-β-d-glucopyranoside (5), in addition to amentoflavone (1), apigenin-7-O-β-d-glucopyranoside (2), apigenin-7-O-6″-E-p-coumaroyl-β-d-glucopyranoside (3) and rutin (6). The structures of isolated compounds were established by 1D, 2D NMR and HRESIMS spectral data, in addition to comparison with literature data. The anti-inflammatory activities of isolated compounds were assessed by measuring the levels of IL-1β, IL-6, TNF-α and PGE2 in the supernatant media of human peripheral blood mononuclear cells (PBMCs) stimulated by phytohaemagglutinin (PHA). At a concentration of 100 μM, compounds 1, 2, 4 and 6 significantly decreased Il-1β, Il-6 and PGE2 to nearly normal values. All tested compounds caused a dose-dependent decrease in TNF-α level but failed to reach that of the control values.
Site-selective synthesis of acacetin and genkwanin through lipase-catalyzed deacetylation of apigenin 5,7-diacetate and subsequent methylation
Fujita, Rie,Hanaya, Kengo,Higashibayashi, Shuhei,Mandal, Susanta,Shoji, Mitsuru,Sugai, Takeshi
, p. 638 - 648 (2019/07/31)
Candida antarctica lipase B-catalyzed deacetylation proceeded with high site-selectivity on the C-4′ acetyl group in apigenin triacetate to give apigenin 5,7-diacetate. Methylation of the liberated hydroxy group with the combination of trimethyloxonium tetrafluoroborate (Meerwein reagent) and 1,8-bis(dimethylamino)naphthalene (proton sponge) in CH2Cl2 proceeded in a quantitative manner to give the product methylated at the C-4′ hydroxy group (acacetin 5,7-diacetate). Even with the same precursor, a different methylation product at the C-7 hydroxy group (genkwanin 4′,5-diacetate) was obtained in 86% yield by applying iodomethane and Cs2CO3 in dimethyl sulfoxide (DMSO). The methylated products were deprotected to form acacetin and genkwanin. We inferred that the latter unexpected methylation was ascribable to the intermolecular migration of an acetyl group from C-7 to C-4′. DFT calculations indicated that the C-7 phenoxide ion was 12.6 kJ/mol more stable than the initially formed C-4′ phenoxide ion.
The invention relates to a raw material to synthesize the tin setose thistle glucoside naringin method (by machine translation)
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Paragraph 0017; 0022; 0023, (2018/11/22)
The invention discloses a to naringin as raw material synthetic tin setose thistle glucoside method, comprises the following steps: S1, synthesis of wild lacquer tree glucoside; S2, compound 5, 7 - dihydroxy - 2 - (4 - methoxyphenyl) - 4 H - chromen - 4 - one synthesis; acetoxy methyl) - 6 - ((5 - hydroxy - 2 - (4 - methoxyphenyl) - 4 - oxo - 4 H - chromen - 7 - yl) oxy) tetrahydro - 2 H - pyran - 3, 4, 5 - [...] acetate synthesis; S4, compound 5 - hydroxy - 2 - (4 - methoxyphenyl) - 7 - (( (2 S, 3 R, 4 S, 5 S, 6 R) - 3, 4, 5 - trihydroxy - 6 - (hydroxymethyl) tetrahydro - 2 H - pyran - 2 - Kiki) oxy) - 4 H - benzopyran - 4 - one synthesis. The invention to naringin as raw materials, by oxidation, methylation, hydrolysis reaction to synthesize tian jigan. (by machine translation)
