Chemical and Pharmaceutical Bulletin
Online ISSN : 1347-5223
Print ISSN : 0009-2363
ISSN-L : 0009-2363
Tannins and Related Compounds. CXVII. Isolation and Characterization of Three New Ellagitannins, Lagerstannins A, B and C, Having a Gluconic Acid Core, from Lagerstroemia speciosa (L.) PERS
Takashi TANAKAHui-Hong TONGYa-Ming XUKanji ISHIMARUGen-ichiro NONAKAItsuo NISHIOKA
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1992 Volume 40 Issue 11 Pages 2975-2980

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Abstract

Lagerstannins A (6), B (11) and C (8), ellagitannins having a gluconic acid core, have been isolated from the fruits and leaves of Lagerstroemia speciosa (L.) PERS. (=L. flos-reginae RETZ.)(Lythraceae). On the basis of chemical and spectroscopic evidence, their structures were established as 2, 3;4, 6-bis-O-(S)-hexahydroxydiphenoyl-D-gluconic acid (6), 2, 3, 5-O-(S, R)-flavogallonyl-4, 6-O-(S)-hexahydroxydiphenoyl-D-gluconic acid (11), and 5-O-galloyl-4, 6-O-(S)-hexahydroxydiphenoyl-D-gluconic acid (8), respectively. Furthermore, the structure of an ellagitannin, punigluconin, previously isolated from the bark of Punica granatum L., was revised as 2, 5-di-O-galloyl-4, 6-O-(S)-hexahydroxy-diphenoyl-D-gluconic acid (10), based on spectral re-examination.

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© The Pharmaceutical Society of Japan
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