tailieunhanh - Study of dracaena angustifolia: II - New steroidal saponins from roots and rhizomes

The MeOH extract of Nam ginseng (roots and rhizomes of Dracaena angustifolia) afforded four new spirostanol saponins, named namonins A-D (1 - 4), along with another four known steroidal saponins (5 - 8). Their structures were determined on basis of spectral analyses and chemical methods. | Journal of Chemistry Vol. 42 2 P. 253 - 256 2004 STUDY OF DRACAENA ANGUSTIFOLIA II - NEW STEROIDAL SAPONINS FROM ROOTS AND RHIZOMES Received 14-5-2003 TRAN LE QUAN1 TRAN KIM QUI1 SHIGETOSHI KADOTA2 College of Natural Sciences National University Ho Chi Minh City Ho Chi Minh City 2Institute of Natural Medicine Toyama Medical Pharmaceutical University Toyama Japan SUMMARY The MeOH extract of Nam ginseng roots and rhizomes of Dracaena angustifolia afforded four new spirostanol saponins named namonins A-D 1 - 4 along with another four known steroidal saponins 5-8 . Their structures were determined on basis of spectral analyses and chemical methods. I - INTRODUCTION Dracaena angustifolia Roxb. Dracaenaceae is locally known as Nam ginseng ginseng from the South in Quang Nam province. Its underground parts are used as tonic and for treatment of leukemia 1 . In our continuing studies on Vietnamese medicinal plants we have examined the constituents of Nam ginseng D. angustifolia and reported5 an isolation of three new spirostanol sapogenins 2 . Further investigation led to isolation of additional four new steroidal saponins named namonins A-D 1 - 4 along with another four known steroidal saponins 5 - 8 . This paper reports the isolation and structural elucidation of these new compounds. II - EXPERIMENTAL General experimental procedures and plant materials were the same as those reported in our previous paper 2 . Extraction and isolation. The MeOH fraction was chromatographed on silica gel with CHCl3-MeOH-H2O 14 6 1 to give 7 fractions. Fraction 1 g was again chromatographed on silica gel to give 3 subfractions. Subfraction 2 520 mg was separated on normal- CHCl3-MeOH-H2O 14 6 and reversed-phase MeOH-MeCN-H2O 2 2 1 pTLC to afford 1 11 mg 2 5 mg 6 50 mg and 7 6 mg . Fractions 2 364 mg was separated on normalphase pTLC CHCl3-MeOH-H2O 14 6 1 to give 5 90 mg . Fraction 4 g was separated by silica gel CC followed by reversed-phase pTLC MeOH-MeCN-H2O 1 1 1 to give 3 19

crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.