Chemical and Chemotaxonomical Studies of Filices. LXXVII. Isolation and Structure of Novel Catechin and Proanthocyanidins from Dennstaedtia distenta MOORE

Abstract

From the fronds of Dennstaedtia distenta, new flavan-3-ol (catechin) derivatives, distenin (1), its dimer (2) and its trimer (3), were isolated in addition to vitexin. On the basis of the spectroscopicand chemical evidence, their structures were established as (2R, 3R)-flavan-3, 5, 7-triol (1), distenin-(4β→8)-distenin (2) and distenin-(4β→8)-distenin-(4β→8)-distenin (3), respectively.