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.
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.