1.Steroidal Saponins from Dracaena humilis (Dracaenaceae) and their Chemotaxonomic Significance
Cédric Mbiesset MOUZIÉ ; Beaudelaire Kemvoufo PONOU ; Romuald Tematio FOUEDJOU ; Rémy Bertrand TEPONNO ; Léon Azefack TAPONDJOU
Natural Product Sciences 2021;27(2):122-127
A new steroidal saponin, (23S,24S)-spirosta-5,25(27)-diene-1β,3β,23,24-tetrol 1-O-((2,3-diacetyl-α-Lrhamnopyranosyl)-(1→2)-[β-D-xylopyranosyl-(1→3)]-α-L-arabinopyranoside)-24-O-β-D-glucopyranoside (humilisoside) together with the known β-sitosterol 3-O-glucopyranoside, adenosine, dioscin, and methylprotodioscin were isolated from the leaves of Dracaena humilis. Their structures were elucidated by spectral techniques including mass spectrometry (ESIMS, HRESIMS, tandem MS-MS), 1D NMR (1H, 13 C NMR), 2D NMR (HSQC, 1H-1 H COSY, HMBC, NOESY), chemical method as well as by comparison with spectroscopic data reported in the literature. The chemotaxonomic significance of the isolation of these compounds is discussed. This is the first report on the phytochemical investigation of D. humilis.
2.Steroidal Saponins from Dracaena humilis (Dracaenaceae) and their Chemotaxonomic Significance
Cédric Mbiesset MOUZIÉ ; Beaudelaire Kemvoufo PONOU ; Romuald Tematio FOUEDJOU ; Rémy Bertrand TEPONNO ; Léon Azefack TAPONDJOU
Natural Product Sciences 2021;27(2):122-127
A new steroidal saponin, (23S,24S)-spirosta-5,25(27)-diene-1β,3β,23,24-tetrol 1-O-((2,3-diacetyl-α-Lrhamnopyranosyl)-(1→2)-[β-D-xylopyranosyl-(1→3)]-α-L-arabinopyranoside)-24-O-β-D-glucopyranoside (humilisoside) together with the known β-sitosterol 3-O-glucopyranoside, adenosine, dioscin, and methylprotodioscin were isolated from the leaves of Dracaena humilis. Their structures were elucidated by spectral techniques including mass spectrometry (ESIMS, HRESIMS, tandem MS-MS), 1D NMR (1H, 13 C NMR), 2D NMR (HSQC, 1H-1 H COSY, HMBC, NOESY), chemical method as well as by comparison with spectroscopic data reported in the literature. The chemotaxonomic significance of the isolation of these compounds is discussed. This is the first report on the phytochemical investigation of D. humilis.
3.Integracide K: A New Tetracyclic Triterpenoid from Desmodium uncinatum (Jacq.) DC. (Fabaceae).
Borice Tapondjou TSAFACK ; Beaudelaire Kemvoufo PONOU ; Rémy Bertrand TEPONNO ; Raymond Ngansop NONO ; Kristina JENETT-SIEMS ; Matthias F MELZIG ; Hee Juhn PARK ; Léon Azefack TAPONDJOU
Natural Product Sciences 2017;23(2):113-118
A new tetracyclic triterpenoid [4,4,24-trimethylcholesta-Δ(8,9;14,15;24,28)-trien-3β,11β,12α-triol-12-acetate, 3-sulfate] sodium salt (1), together with eight known compounds including ergosterol 5α,8α-endoperoxide (2), 1,9-dihydroxy-3-methoxy-2-methylpterocarpan (3), 3-O-β-D-2-acetyl-amino-2-deoxyglucopyranoxyloleanoic acid (4), hydnocarpin (5), derrone (6), isovitexin (7), erythrinin C (8), and 5,4'-dihydroxy-2''-hydroxyisopropyldihydrofurano [4,5:7,8]-isoflavone (9), were isolated from the EtOAc soluble fraction of the methanol extract of aerial part of Desmodium uncinatum collected in the western highland of Cameroon. The structures of these compounds were established by comprehensive interpretation of their spectral data mainly including 1D- (¹H and ¹³C), 2D-NMR (¹H-¹H COSY, HMQC, HMBC) spectroscopic and ESI-TOF-MS mass spectrometric analysis. The isolation of an integracide-like compound from plant origin is a very unusual finding.
Cameroon
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Ergosterol
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Fabaceae
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Methanol
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Plants
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Sodium
4.A New Flavonol Glycoside from Tristemma hirtum (Melastomataceae)
Joseph Nandjou KENFACK ; Beaudelaire Kemvoufo PONOU ; Jonas KÜHLBORN ; Rémy Bertrand TEPONNO ; Raymond Ngansop NONO ; Romuald Tématio FOUEDJOU ; Till OPATZ ; Hee Juhn PARK ; Léon Azefack TAPONDJOU
Natural Product Sciences 2018;24(3):213-218
Chemical investigation of the plant Tristemma hirtum P. Beauv (Melastomataceae) resulted to the isolation of a new flavonol glycoside named quercetin-7-O-α-D-arabinofuranoside (1), together with nine known compounds including 3′-hexadecanoyl-2′-(9aZ)-tetradecanoyl-glycerol 1′-O-[β-D-galactopyranosyl-(1″ → 6″)-α-D-galactopyranoside] (2), arjunolic acid (3), β-sitosterol-3-O-β-D-glucopyranoside (4), terminolic acid (5), quercetin (6), asiatic acid (7), maslinic acid (8), 1β-O-galloylpedunculagin (9) and 6-hydroxyapigenin 7-O-β-D-glucopyranoside (10) from the methanol extract using normal and reversed phase column chromatography. The structures of these compounds were determined by comprehensive interpretation of their spectral data mainly including 1D- 2D-NMR (¹H-¹H COSY, HSQC, and HMBC) spectroscopic and ESI-TOF-MS mass spectrometric analysis.
Chromatography
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Melastomataceae
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Methanol
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Plants
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Quercetin