tailieunhanh - Silychristin and isosilychristin from the fruits of silybum marianum (l.) gaertn

By various chromatography methods, two flavonolignan silychristin (1) and isosilychristin (2) were isolated from the fruits of Silybum marianum (L.) Gaertn. cultivated in the North of Vietnam. Their structures were elucidated by analyses of the NMR (1D-, 2D-NMR) and ESI spectra. This is the first report of both 1 and 2 from S. marianum cultivated in Vietnam. | Journal of Chemistry Vol. 45 1 P. 106 -109 2007 SILYCHRISTIN AND ISOSILYCHRISTIN FROM THE FRUITS OF SILYBUM MARIANUM L. GAERTN. Received 31 May 2006 TRINH THI DIEP1 PHAN VAN KIEM2 NGUYEN THUONG DONG1 NGUYEN HUU TUNG2 BUI THI BANG1 CHAU VAN MINH2 ALESSANDRA BRACA3 1National Institute of Medicinal Materials Ministry of Health institute of Natural Products Chemistry VAST 3Department of Bioorganic Chemistry and Biopharmaceutics University of Pisa Italia SUMMARY By various chromatography methods two flavonolignan silychristin 1 and isosilychristin 2 were isolated from the fruits of Silybum marianum L. Gaertn. cultivated in the North of Vietnam. Their structures were elucidated by analyses of the NMR 1D- 2D-NMR and ESI spectra. This is the first report of both 1 and 2 from S. marianum cultivated in Vietnam. I - INTRODUCTION spectrometer using TMS as the internal standard. Column chromatography CC was In previous papers we have reported the isolation and structural elucidation of flavonolignan flavonoid and lignan compositions of the fruits of Silybum marianum L. Gaertn. cultivated in the North of Vietnam and used in folk medicine 1 - 4 . Here we report the isolation and structural determination of two flavonolignan silychristin 1 and isosilychristin 2 isolated from the fruits of Silybum marianum L. Gaertn. cultivated in the North of Vietnam. The structures were elucidated by analyses of the NMR and ESI spectra and by the reported data. This is the first report of both 1 and 2 from S. marianum cultivated in Vietnam. II - EXPERIMENTAL 1. General experimental procedures The Electronspray Ionization ESI mass spectrum was obtained using a AGILENT 1100 LC-MSD Trap spectrometer. The NMR spectra were recorded on a Bruker AM500 FT-NMR 106 performed on silica gel Kieselgel 60 70 - 230 mesh and 230 - 400 mesh Merck or YMC RP-18 resins 30 - 50 pm FuJisilisa Chemical Ltd. . Thin layer chromatography TLC was performed on DC-Alufolien 60 F254 Merck or RP18 F254s Merck plates. .

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