Structure and synthesis of the first procassinidin dimers based on epicatechin, and gallo- and epigallo-catechin
摘要:
The range of natural dimeric procassinidins is extended by identification of cassiaflavan-(4 alpha --> 8)-epicatechin, cassiaflavan-(4 alpha --> 8)-epigallocatechin, cassiaflavan-(4 beta --> 8)-epicatechin, cassiaflavan-(4 beta --> 8)-epigallocatechin, cassiaflavan-(4 beta --> 8)-gallocatechin, ent-cassiaflavan-(4 beta --> 8)-epicatechin and cassiaflavan-(4 alpha --> 6)-epicatechin in the bark of Cassia petersiana. Their structures and absolute configuration were confirmed by synthesis. (C) 2000 Elsevier Science Ltd. All rights reserved.