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Three new quinolizidine alkaloids (1 − 3), including one new naturally isoflavone and cytisine polymer (3), along with 6 known ones were isolated from the ethanol extract of Sophora tonkinensis Gagnep. Their structures were elucidated by comprehensive spectroscopic data analysis (IR, UV, HRESIMS, 1D and 2D NMR), combined with ECD calculations. The antifungal activity against Phytophythora capsica, Botrytis cinerea, Gibberella zeae, and Alternaria alternata of the compounds was evaluated in a mycelial inhibition assay. Biological tests indicated that compound 3 exhibited strong antifungal activity against P. capsica with EC50 values of 17.7 μg/ml. [ABSTRACT FROM AUTHOR]

Two new isoflavones (1 and 2), as well as eight known ones were isolated from the roots of Sophora tonkinensis Gagnep. Compound 1 represents an unprecedented polymerization pattern constructed by isoflavone and cytisine. Their structures were elucidated by comprehensive spectroscopic data analysis, combined with ECD calculations. Compound 1 displayed significant anti-tobacco mosaic virus (TMV) activity compared with the positive control ningnanmycin. Moreover, compound 6 exhibited potent α-glucosidase inhibitory activity with IC50 value of 47.4 mg/L. [ABSTRACT FROM AUTHOR]

Two new (1 and 2) cytisine-type alkaloids that were chemically inseparable isomers (present in a 1:1 ratio) were identified from the seeds of Thermopsis lanceolata R. Br. Their structures were elucidated by comprehensive spectroscopic data analysis (IR, UV, NMR, HRESIMS) and ECD calculation. Compound 1 displayed significant anti-tobacco mosaic virus (TMV) activity, while compounds 1 and 2 displayed moderate insecticidal activities against Aphis fabae with LC50 value of 43.15 and 46.47 mg/L, respectively. [ABSTRACT FROM AUTHOR]

Main observation and conclusion: Eleven biogenetically related polyprenylated acylphloroglucinols (PPAPs), including four novel skeletons (1—4) and five new compounds (5—9), were isolated from the flowers of Hypericum monogynum. Hypermonones A—D (1—4) represented the first example of a unique dilactone structure containing carbonyl bonded single δ‐lactone and tricyclic γ‐lactone moieties. Their structures were elucidated by NMR analysis, X‐ray crystallography, and ECD calculations. Moreover, we revised the structure of hyperibrin B to hypermonone I (9) via NMR analysis, a quantum computational chemistry method, and hypothetic biosynthetic considerations. Three compounds (5, 6, and 9) with significant MDR reversal activity (RF ranging from 61 to 223) were superior to the positive control verapamil (MCF‐7/ADR, RF: 53; HepG2/ADR, RF: 124). Mechanism study for compound 5 indicated that this compound could inhibit the function of P‐gp transport rather than its expression, and the possible recognition mechanism between compound 5 and P‐gp was predicted by molecular docking. [ABSTRACT FROM AUTHOR]

Two new compounds, including one new arylbenzofuran (1) and one new pterocarpanoid (2), along with nine known ones, were isolated from the seeds of Sophora tonkinensis. The structures of the new compounds were elucidated based on a comprehensive spectroscopic data analysis. Compounds 2 and 3 exhibited good anti-tobacco mosaic virus (TMV) activities with the protective inhibition rate of 69.62% and 68.72% respectively, at concentration of 100 μg/ml. [ABSTRACT FROM AUTHOR]