Correction to A New Geranyl Phenylacetate Glycoside from the Twigs of Aphanamixis polystachya
(Source: Chemistry of Natural Compounds)
Source: Chemistry of Natural Compounds - September 14, 2023 Category: Chemistry Source Type: research
Correction to Isolation of Ribosome-Inactivating Proteins from Seeds of Nigella sativa
(Source: Chemistry of Natural Compounds)
Source: Chemistry of Natural Compounds - September 14, 2023 Category: Chemistry Source Type: research
Bromination of Triacanthine
Bromination of the purine alkaloid triacanthine byN-bromosuccinimide in CHCl3, AcOH, and various alcohols was studied. The new derivatives 8-bromo-, 12,13-dibromo-, 8,12-dibromo-13-hydroxymethyl-, hydroxyethyl-, hydroxypropyl-, and hydroxybutyltriacanthine were prepared. The structures of the prepared compounds were proven using1H and13C NMR spectral data and X-ray crystal structure analyses. (Source: Chemistry of Natural Compounds)
Source: Chemistry of Natural Compounds - September 13, 2023 Category: Chemistry Source Type: research
New Coumarins of the Family Apiaceae. I. Khellactone Esters from Phlojodicarpus sibiricus
An investigation of the hexane extract of subterranean organs ofPhlojodicarpus sibiricus (Fisch.) Koso-Pol. (Apiaceae) led to the isolation of 20 compounds, including four new coumarins, the structures of which were elucidated using UV, CD, and NMR spectroscopy and mass spectrometry as (3 ′S,4′S)-3′-O-isovaleroyl-4′-O-isobutyroyl-cis-khellactone (phlojosibirin I,1), (3 ′S,4′S)-3′-O-isobutyroyl-4′-O-angeloyl-cis-khellactone (phlojosibirin II,2), (3 ′S,4′S)-3′-O-isobutyroyl-4′-O-senecioyl-cis-khellactone (phlojosibirin III,3), and (3 ′S,4′S)-3′-O-senecioyl-4′-O-isobutyroyl-cis-khellactone (phl...
Source: Chemistry of Natural Compounds - September 13, 2023 Category: Chemistry Source Type: research
Carboline Alkaloids from the Cigar Tobacco-Derived Fungi Aspergillus sp. and Their Anti-TMV Activity
Two newβ-carboline alkaloids, 1-acetyl-6-hydroxymethyl-7-methoxy-β-carboline (1) and 1-acetyl-6- hydroxymethyl-8-methoxy-β-carboline (2), together with four known ones (3 –6) were isolated from the cigar tobacco (a variety ofNicotiana tabacum L.)-derived endophytic fungiAspergillus sp. Their structures were determined by means of HR-ESI-MS and extensive 1D and 2D NMR spectroscopic studies. The anti-TMV activities test revealed that compounds1 and2 showed potential anti-TMV activities with inhibition rates of 31.8 and 35.5%, respectively. These rates are close to that of positive control. Compounds3 –6 also showed an...
Source: Chemistry of Natural Compounds - September 13, 2023 Category: Chemistry Source Type: research
Flavonoids from the Aerial Part of Picris koreana
The flavonoids isoetin-2 ′-O-α-L-arabinopyranoside (1), isoetin-2 ′-O-β-D-galactopyranoside (2), isoetin-2 ′-O-(6′′-O-acetyl)-β-D-galactopyranoside (3), and luteolin-4 ′-O-β-D-glucopyranoside (4), which were identified using NMR spectroscopic methods, were isolated for the first time from the aerial part ofPicris koreana (Kitam.) Vorosch. growing in Primorsky Krai of the Russian Far East. Flavonoids2 and3 were new compounds that were previously unreported in the literature. (Source: Chemistry of Natural Compounds)
Source: Chemistry of Natural Compounds - September 13, 2023 Category: Chemistry Source Type: research
Study on the Preparation and Anticoagulant Effect of Monospora Acid
(Source: Chemistry of Natural Compounds)
Source: Chemistry of Natural Compounds - September 13, 2023 Category: Chemistry Source Type: research
Chemical Constituents of Nelumbo nucifera Seed Epicarp
(Source: Chemistry of Natural Compounds)
Source: Chemistry of Natural Compounds - September 13, 2023 Category: Chemistry Source Type: research
Two New Phloroglucinol Derivatives from Syzygium fluviatile
Two new phloroglucinol derivatives were isolated from the leaves ofSyzygium fluviatile. The structures were elucidated as (Z,Z,Z)-1-(2,4-dihydroxy-6-methoxyphenyl)-octadeca-9,12,15-trien-1-one (1) and (Z,Z)-1-(5-methyl-2,4-dihydroxy-6-methoxyphenyl)-octadeca-9,12-dien-1-one (2) by means of extensive spectroscopic analyses including HR-ESI-MS and NMR spectra. Among them, compound1 exhibited significant inhibitory activity against α-glucosidase with an IC50 value of 3.63 μM. (Source: Chemistry of Natural Compounds)
Source: Chemistry of Natural Compounds - September 13, 2023 Category: Chemistry Source Type: research
Structure and Biological Activity of an Arabinogalactan from Ferula tenuisecta
The arabinogalactan AG-Ften of molecular mass 40 kDa consisting of galactose and arabinose in a 25:10.6 ratio was isolated from the aerial part ofFerula tenuisecta. AG-Ften was found to consist of D-galactopyranoses bound byβ-1,6-glycoside bonds as the main chain and a side chain ofα-arabinose,β-galactose, and 4-O-methylglucuronic acid by using methylation, GC, GC-MS, and13C NMR spectroscopy. TheF. tenuisecta polysaccharides exhibited bifidogenic activity. (Source: Chemistry of Natural Compounds)
Source: Chemistry of Natural Compounds - September 13, 2023 Category: Chemistry Source Type: research
Esterification of Betulin 3-Acetate in Melts of Some Organic Acids
Synthetic methods for betulin 3-acetate-28-benzoate, betulin 3-acetate-28-p-bromobenzoate, betulin 3-acetate-28-cinnamate, betulin 3-acetate-28-succinate, and betulin 3-caetate-28-phthalate based on the reaction of betulin 3-acetate with fused benzoic, p-bromobenzoic, cinnamic, succinic, and phthalic acids at 185 –195°C for 5–6 min are proposed for the first time. (Source: Chemistry of Natural Compounds)
Source: Chemistry of Natural Compounds - September 13, 2023 Category: Chemistry Source Type: research
A New Coumarin and Anti-Inflammatory Constituents from Polygonatum chingshuishanianum
A new coumarin, methyl (E)-4-((6-methoxy-2-oxo-2H-chromen-7-yl)oxy)-2-methylbut-2-enoate (1), has been isolated from the rhizomes ofPolygonatum chingshuishanianum, together with six known compounds – scopoletin (2), rutin (3), isoquercetin (4), hyperoside (5), (3R)-5,7-dihydroxy-3-(2 ′,4′-dihydroxybenzyl)-chroman-4-one (6), and (3R)-5,7-dihydroxy-6-methoxy-8-methyl-3-(2 ′,4′-dihydroxybenzyl)-chroman-4-one (7). The structure of new compound1 was determined through spectroscopic and MS analyses. Among the isolates compounds3–6 showed potent inhibition with IC50 values of 10.25 ± 0.75, 17.60 ± 1.28, 18.82 ± 1.6...
Source: Chemistry of Natural Compounds - September 13, 2023 Category: Chemistry Source Type: research
Flavonoids from Syzygium pyrifolium
(Source: Chemistry of Natural Compounds)
Source: Chemistry of Natural Compounds - September 13, 2023 Category: Chemistry Source Type: research
Migrastatin, Isomigrastatin and Their Analogues Isolated from Streptomyces ardus
(Source: Chemistry of Natural Compounds)
Source: Chemistry of Natural Compounds - September 13, 2023 Category: Chemistry Source Type: research
A New Acridone Alkaloid from the Leaves of Glycosmis lucida
Extraction and chromatographic separation of the extracts of dried leaves ofGlycosmis lucida lead to the isolation of a new acridone alkaloid lucidaine A (1), along with two known analogues2 and3. The structure of1 was established by extensive spectroscopic analysis (1D and 2D NMR, HR-ESI-MS), and the known compounds were identified by comparisons with data reported in the literature. Furthermore, the cytotoxicity activities of all isolated alkaloidsin vitro were evaluated. (Source: Chemistry of Natural Compounds)
Source: Chemistry of Natural Compounds - September 13, 2023 Category: Chemistry Source Type: research
