Advances in plant glycosides, chemistry and biology: by China) International Symposium on Plant Glycosides (1997

By China) International Symposium on Plant Glycosides (1997 Kunming, Chong-Ren Yang, Osamu Tanaka, Chong-Ren Yang, Osamu Tanaka

Within the plant country quite a few chemical components take place in a glycoside shape (conjugation with sugar). Glycosides are vital, secondary metabolites. The structural range is due to the the mammoth quantity of types and stereochemical configurations of the sugar part. Aglycones belong to terpenoid, steroid, flavonoid, quinonoid, lignan, different basic phenolics, and isothiocyanate. even though, organic actions of glycosides are, in lots of circumstances, at risk of 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 subsequent reasons:

• they're tough to isolate and purify

• they've got a crucial organic functionality in flora and memorable organic activities

• they're a vitally important source of normal medication, wellbeing and fitness meals, cosmetics and f

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Additional resources for Advances in plant glycosides, chemistry and biology: proceedings of the International Symposium on Plant Glycosides, August 12-15, 1997 Kunming, China

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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 !

5. , Tanaka, O. -H. (1991) Chem. Pharm. Bull. 39, 1871. 6. , Nishino, H. and Kozuka, M. (1997) Proceeding of the International Conference on Food Factors, Ohigashi, H. et al. eds. (Springer-Verlag), in press. 7. , Kobayashi, M. and Arihara, S. (1996) Nat. Med. 50, 176. 8. , Masuda, H. and Mizutani, K. (1996) "Saponins Used in Food and Agriculture" Waller, G. R. and Yamasaki, K. eds. (Plenum Press, New York, London) pp. 1-11. 9. , Hosokawa, I. and Mihashi, K. (1974) Chem. Pharm. Bull. 22, 2164. 10.

First, we examined the anodic oxidation of soyasapogenol B (51), using halide as a mediator in the solvent system having the dissolving ability for both of triterpene and electrolyte. As is apparent from Table 4, indirect anodic oxidations of 51 under almost all conditions (Runl-5) yielded the 3-ketone derivative (52) as the only oxidation product and, by exhaustive oxidation for 5h (Run 6), the 3, 22-diketone derivative (54) was obtained as the minor product. 9% yield by the electrolysis for 10min.

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