Abstract: Five novel isoquinoline alkaloids (+)-N-(methoxylcarbonyl)-N-nordicentrin (1), (+)-N-(methoxylcarbonyl)-N-norpredicentrine (2), (+)-N-(methoxylcarbonyl)-N-norbulbodione (3), and (+)-N-(methoxylcarbonyl)-N-norisocorydione (4), and (+)-8-methoxyisolaurenine-N- oxide (5) were isolated, together with one known compound, (+)-N-(methoxylcarbonyl)- N-norglaucine (6), from a 70% EtOH extract of the barks of Litsea cubeba. Structural elucidation of all the compounds were performed by spectral methods such as 1D- and 2D-NMR, IR, UV, and HRESIMS. Alkaloids 1, 2 and 6 showed antimicrobial activity against the bacterium S. aureus and two fungi (A. alternata and C. nicotianae). Compounds 3,4 exhibited significant cytotoxicity against all of six tested tumor cell lines.
Keywords: Litsea cubeba; Lauraceae; isoquinoline alkaloids; antibacterial; antifungal; cytotoxicity
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Zhang, W.; Hu, J.-F.; Lv, W.-W.; Zhao, Q.-C.; Shi, G.-B. Antibacterial, Antifungal and Cytotoxic Isoquinoline Alkaloids from Litsea cubeba. Molecules 2012, 17, 12950-12960.
Zhang W, Hu J-F, Lv W-W, Zhao Q-C, Shi G-B. Antibacterial, Antifungal and Cytotoxic Isoquinoline Alkaloids from Litsea cubeba. Molecules. 2012; 17(11):12950-12960.
Zhang, Wei; Hu, Jin-Feng; Lv, Wen-Wen; Zhao, Qing-Chun; Shi, Guo-Bing. 2012. "Antibacterial, Antifungal and Cytotoxic Isoquinoline Alkaloids from Litsea cubeba." Molecules 17, no. 11: 12950-12960.