By Chong-Ren Yang, Osamu Tanaka

ISBN-10: 0080544541

ISBN-13: 9780080544540

ISBN-10: 0444501800

ISBN-13: 9780444501806

Hardbound. within the plant nation numerous chemical elements take place in a glycoside shape (conjugation with sugar). Glycosides are very important, secondary metabolites. The structural variety is because of the the tremendous volume of types and stereochemical configurations of the sugar part. Aglycones belong to terpenoid, steroid, flavonoid, quinonoid, lignan, different uncomplicated phenolics, and isothiocyanate. although, organic actions of glycosides are, in lots of instances, vulnerable to the character of sugar moieties, although their aglycone is the same.Since the 80s, plant glycosides were attracting an expanding quantity of curiosity from botanists and phytochemists world-wide for the next purposes: - they're tough to isolate and purify- they've got a vital organic functionality in flora and noteworthy organic actions- they seem to be a vitally important source of ordinary medication, future health foodstuff, cosmetics and f

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Extra resources for Advances in Plant Glycosides, Chemistry and Biology, Proceedings of the International Symposium in Plant Glycosides

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On the other hand, chemical oxidations found to give the 22-ketone derivative (soyasapogenol E, 53). This evidence showed that the indirect anodic oxidation selectively proceeded the oxidation of 3-equatorial hydroxyl group in preference to the 22-axial hydroxyl group which was easily oxidized by other oxidants. Table 4. Indirect Anodic Oxidation ") of Soyasapogenol B (51) b) with Different Electrolytes and Solvent Systems Run Solvent (ml) . . 8 Complex mixture a) Constant current electrolysis (Pt anode and cathode, 13mA/cm2) in an undivided beaker with vigorous stirring.

168). 21. McManus O. , Harris G. , Reuben J. , Burka J. , Garcia M. , Biochemistry, 32 6128---6133(1993). 22. , Chem. Pharm. , 45 570---572(1997). 23. , Chem. Pharm. , 'Recent Advances in Electroorganic Synthesis", ed. , Kodensha-Elsevier, 1987, p. , Chem. Pharm. , Yoshikawa M. , 44, 633--635(1996). CANCER CHEMOPREVENTIVE ACTIVITIES OF PANAX N O T O G I N S E N G A N D G I N S E N O S I D E R G I ~) Takao Konoshima Kyoto Pharmaceutical University, Misasagi, Yamashina-ku, Kyoto 607, Japan Introduction Currently, although many kinds of anti-tumor agents are developed and the medicinal sciences make rapid progress in the treatment of cancer, cancer is the most tragic disease and one of the major cause of death in the world.

O,,,~-~oZ~ --~'OH ~o. b. ~ , c . ooc -O,,,~.. ooc HOOG 0 ..... _o U. oOC-o .... o OH HO o. ~~~.... ~OH HO~( > R2 Hal" OH o ~0 HO"' H betavulgaroside V (5)" R]=Glc, R2=CH2OH betavulgaroside IX (9) : R]=GIc, RZ=H O~;O H )C. -, ,, -o, ,, c ~ o J" ..... betavulgarosidr X (10) Glc: I]-D-glucopyranosyl Chart 2. ~O~/,,OMe a),b) O ~ . , , , O M e / )2--{,2 "~0 "OTBDMS OHC--~.. ROOC-~. ''OMe HO OH OTBDMS H OH 11 12 13 14" R=H "L-arabinose 14a : R=Me HO~ ~ ROOC k--O H _~OMe ROOCq . H OH 16 : R=H 16a : R=Me OMe ~ HO OH 15 ROOC X--O H ~,~-OMe ROOC~ H OH 17: R=H 17a : R=Me ROOC X--O H /,,OMe ROOC~--& H OH 18: R=H 18a: R=Me ,---,- A" R=Me !

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Advances in Plant Glycosides, Chemistry and Biology, Proceedings of the International Symposium in Plant Glycosides by Chong-Ren Yang, Osamu Tanaka


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