A new β-ionone, litulipiferic acid (1) was isolated from the leaves of Liriodendron tulipifera (Magnoliaceae). The structure of the new β-ionone was elucidated by chemical and physical evidence.
A new β-ionone, litulipiferic acid (1) was isolated from the leaves of Liriodendron tulipifera (Magnoliaceae). The structure of the new β-ionone was elucidated by chemical and physical evidence.
A new isoflavone, 4′-hydroxy-5,7,2′-trimethoxyisoflavone (1), has been isolated from the fruits of Myristica elliptica var. simiarum, together with seven known compounds, 2′-hydroxygenistein (2), licarin A (3), accuminatin (4), guaiacin (5), virolane (6), elimicin (7), and β-sitosterol (8). The structure of the new compound 1 was determined through spectroscopic and MS analyses. Among the isolated compounds, 4′-hydroxy-5,7,2′-trimethoxyisoflavone (1), 2′-hydroxygenistein (2), licarin A (3), and guaiacin (5) showed potent inhibition with IC50 values of 24.18 ± 2.09, 16.39 ± 1.26, 22.68 ± 2.30, and 27.01 ± 2.42 μM, respectively, against LPS-induced NO generation.
A new chromone, (S)-5-hydroxy-2,8-bis(hydroxymethyl)-2-methyl-2H,6H-pyrano[3,2-g]chromen-6-one [named polymorphachromotriol, (5)], was isolated from the leaves Angelica poylmorpha along with seven known compounds hamaudol (1), isocopoletin (2), nodakenetin (3), 2′,3′ -dehydromarmesin (4), oxypeucedanin hydrate (6), norcimifugin (7), and cimifugin (8). NMR and CD techniques were used to elucidate their structures.
Cynaroside, cosmosiin, isoorientin, kaempferol, quercimeritrin, and gigantoside B, which was a new compound with the structure 3,5,7,3′,4′-pentahydroxyflavone 7-O-(6′′-O-β-D-xylopyranosyl)-β-Dglucopyranoside, were isolated for the first time from the aerial part of Cephalaria gigantea (Ledeb.) Bobrov cultivated in Samara Region. The chemical structures of the isolated flavonoids were studied using UV, 1H and 13C NMR spectroscopy; mass spectrometry; and chemical transformations.
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