Chemical and Pharmaceutical Bulletin
Online ISSN : 1347-5223
Print ISSN : 0009-2363
Tannins and Related Compounds. CVII. Structure Elucidation of Three New Monomeric and Dimeric Ellagitannins, Flosin B and Reginins C and D, Isolated from Lagerstroemia flos-reginae RETZ.
Ya-Ming XUTakashi TANAKAGen-ichiro NONAKAItsuo NISHIOKA
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1991 Volume 39 Issue 3 Pages 647-650


Further chemical work on tannins in the leaves of Lagerstroemia flos-reginae RETZ. (Lythraceae) has resulted in the isolation of new monomeric (flosin B) and dimeric ellagitannins (reginins C and D), together with pterocarinin A (1) and 5-desgalloylpterocarinin A (2). On the basis of chemical and spectroscopic evidence, the structure of flosin B was determined to be a C-glycosidic ellagitannin (3) possessing a valoneic acid dilactonyl group, while reginins C and D were characterized as dimeric ellagitannins (6 and 10, respectively), in which a pedunculagin moiety is connected to pterocarinin A and casuarinin [the C-1 epimer of stachyurin (5)] moieties, respectively, through a carbon-to-oxygen bond.

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