Tannins and Related Polyphenols of Euphorbiaceous Plants. VII. Tirucallins A, B and Euphorbin F, Monomeric and Dimeric Ellagitannins from Euphorbia tirucalli L.

Abstract

A new monomeric hydrolyzable tannin, tirucallin A (7), and two new dimers, tirucallin B (11) and euphorbin F (14), have been isolated, together with six known polyphenols including euphorbin A, from the stems of Euphorbia tirucalli L., and their structures were elucidated by spectral and chemical methods. Euphorbin F (14) possesses dehydrohexahydroxydiphenoyl and valoneoyl groups, and tirucallin A (7) has a dilactonized veloneoyl group. The orientation of the valoneoyl group of euphorbins A and B was revised.