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10 résultats
Isoprenylated phenolic compounds with tyrosinase inhibition from Morus nigra.
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A new isoprenylated sanggenon-type flavanone, nigrasin K (1), together with three known analogs (2-4) and five known Diels-Alder adducts (5-9), were isolated from the twigs of Morus nigra. Their structures were elucidated by spectroscopic methods. Sanggenon M (2), chalcomoracin (5), sorocein H (6),
Guangsangons F-J, anti-oxidant and anti-inflammatory Diels-Alder type adducts, from Morus macroura Miq.
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Five Diels-Alder type adducts, named guangsangons F, G, H, I, and J, along with two known compounds, mulberrofuran J and kuwanon J, were isolated from Morus macroura Miq. Their structures were determined by means of spectroscopic analyses and chemical methods. These compounds were regarded
[Flavonoids from the leaves of Morus alba L].
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The investigation on the leaves of Morus alba L. was carried out to find the relationship of the constituents and the pharmacological activities. The isolation and purification were performed by various chromatographies such as silica gel, Sephadex LH-20, RP-C18 column chromatography and so on.
[Chemical constituents from cell cultures of Morus alba].
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The column chromatography on silica gel, Sephadex LH-20 and semi-preparative HPLC were used to separate and purify the compounds from the EtOAc extract of medium and MeOH extract of cell cultures of Morus alba. Eight compounds were isolated. Based on physico-chemical properties and spectroscopic
Chalcone-derived Diels-Alder adducts as NF-κB inhibitors from Morus alba.
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A bioassay-guided phytochemical fractionation of the methanol extract of the Morus alba root barks led to the isolation of two chalcone-derived Diels-Alder adducts (1 and 2). Their structures were elucidated as kuwanon J 2,4,10″-trimethyl ether (1) and kuwanon R (2) by means of spectroscopic
Potential cytotoxic Diels-Alder type adducts from liquid medium of Morus Alba var. shalun root cultures.
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A new Diels-Alder type adduct named morushalunin (1), together with three similar compounds, guangsangon E (2), chalcomoracin (3), and kuwanon J (4) were isolated from the EtOAc extract of liquid medium of Morus alba var. shalun root cultures. The structures
Chemistry and biosynthesis of isoprenylated flavonoids from Japanese mulberry tree.
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Many isoprenylated flavonoids have been isolated from Japanese mulberry tree (Moraceae). Among them, kuwanons G (1) and H (2) were the first isolated active substances exhibiting a hypotensive effect. These compounds are considered to be formed through an enzymatic Diels-Alder type reaction between
Protein tyrosine phosphatase 1B inhibitors isolated from Morus bombycis.
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Bioassay-guided fractionation of the chloroform-soluble fraction of Morus bombycis, using an in vitro PTP1B inhibitory assay led to the identification of three 2-arylbenzofurans, albafuran A (1), mulberrofuran W (2) and mulberrofuran D (6), along with three chalcone-derived Diels-Alder products,
Synthetic studies towards the mulberry Diels-Alder adducts: H-bond accelerated cycloadditions of chalcones.
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The methyl ether derivatives 2, 4 and 6 of the mulberry Diels-Alder adducts chalcomoracin (1) and mulberrofuran C (3) and kuwanon J (5) respectively have been synthesized by a thermal [4 + 2]-cycloaddition reaction between a chalcone and dehydroprenyl diene. A H-bonded ortho OH substituent on the
[Chemistry and biosynthesis of prenylflavonoids].
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Many isoprenylated flavonoids have been isolated from mulberry trees and related plants (Moraceae). Among them, kuwanons G (13) and H (14) were the first isolated active substances exhibiting a hypotensive effect from the Japanese Morus root bark. These compounds are considered to be formed through
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