Phytochemical investigation of the aerial parts of Baeckea frutescens resulted in the isolation of three new mono-or sesquiterpene-based meroterpenoids, frutescones S-U(1-3), and one pair of new(±)-5,7-dihydroxy-...Phytochemical investigation of the aerial parts of Baeckea frutescens resulted in the isolation of three new mono-or sesquiterpene-based meroterpenoids, frutescones S-U(1-3), and one pair of new(±)-5,7-dihydroxy-8-isobutyryl-6-methyldihydroflavonol(4). Their structures and absolute configurations were established by HR-ESI-MS, 1D and 2D NMR, and quantum chemical ECD calculation. Compound 1 exhibited inhibitory effect on NO production in LPS-activated RAW 264.7 macrophages with an IC50 value being 0.81 μmol·L–1.展开更多
基金the National Natural Science Foundation of China (Nos.81803392, 81573309 and 81973206)the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (No. 2017BT01Y036)+3 种基金the National Key R&D Program of China (No. 2017YFC1703802)theNatural Science Foundation of Jiangsu Province (No. BK20180566)the Funding of Double First-rate Discipline Innovation Team (Nos.CPU2018GF05 and CPU2018GY11)the China Postdoctoral Science Foundation funded project (No. 2018M630644)。
文摘Phytochemical investigation of the aerial parts of Baeckea frutescens resulted in the isolation of three new mono-or sesquiterpene-based meroterpenoids, frutescones S-U(1-3), and one pair of new(±)-5,7-dihydroxy-8-isobutyryl-6-methyldihydroflavonol(4). Their structures and absolute configurations were established by HR-ESI-MS, 1D and 2D NMR, and quantum chemical ECD calculation. Compound 1 exhibited inhibitory effect on NO production in LPS-activated RAW 264.7 macrophages with an IC50 value being 0.81 μmol·L–1.