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Picraquanines A-C, three new phenolic derivatives from the stems of Picrasma quassioides.

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Three new phenolic derivatives, picraquanines A-C (1-3), along with 6 known ones 4-9 were obtained from the stems of Picrasma quassioides (D. Don) Benn. The new structures were determined by… Click to show full abstract

Three new phenolic derivatives, picraquanines A-C (1-3), along with 6 known ones 4-9 were obtained from the stems of Picrasma quassioides (D. Don) Benn. The new structures were determined by extensive spectroscopic data analysis, including IR, HRESIMS, 1H-NMR, 13C-NMR, HSQC, HMBC, 1H-1H COSY experiments. The absolute configuration of 1 was determined by comparison of its experimental and calculated ECD spectra. Furthermore, all the compounds were tested for their nitric oxide (NO) inhibitory effects against LPS-stimulated RAW 264.7 cells, however, none of them exhibited inhibitory effects (IC50 >100 μM).[Figure: see text].

Keywords: new phenolic; picrasma quassioides; picraquanines three; three new; stems picrasma; phenolic derivatives

Journal Title: Natural product research
Year Published: 2020

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