Structure and synthesis of phlobatannins related to the (4α,6:4β,8)-bis-fisetinidol-catechin profisetinidin triflavanoid
作者:Susanna L. Bonnet、Jan P. Steynberg、Barend C.B. Bezuidenhoudt、Catharina M.Saunders、Daneel Ferreira
DOI:10.1016/0031-9422(96)00239-7
日期:1996.9
The natural class of phlobaphene condensed tannins is complemented by two functionalized hexahydrodipyrano[2,3-f:2',3'-h]chromene representing the products of stereoselective pyran ring rearrangement of the 2,3-trans-3,4-trans- and 2,3-trans-3,4-cis-flavan-3-ol moieties in the bis-fisetinidol-(4 alpha,6:4 beta,8)-catechin triflavanoid. Structural eludication of these complex natural products was effected by synthesis via base-catalysed conversion of the 4-O(E)-methyl ether of their presumed profisetinidin triflavanoid precursor. Copyright (C) 1996 Elsevier Science Ltd