A-Type Proanthocyanidins from the Bark of Parameria laevigata

Authors :: Hanani Endang
Akiko Ohno
Mansur Umar
Toshiko Satake
Yukiko Horii
Kohei Kamiya
Source :: HETEROCYCLES. 60:1697
Publication Year :: 2003
Publisher :: The Japan Institute of Heterocyclic Chemistry, 2003.
Abstract: Parameritannin A-3, a new tetrameric A-type proanthocyanidin, along with the cinnamtannin B-2, pavetannin C-1 and cinnamtannin D-1 have been isolated from the bark of Parameria laevigata. Complete assignments by spectroscopic analysis established their structures as epicatechin - (2β→O→7, 4β→6)-epicatechin - (2β→O→7, 4β→8) - epicatechin - (4β→8) - epicatechin, epicatechin-(4b→8)-epicatechin-(2β→O→7, 4β→8)-epicatechin-(4β→8)-epicatechin, epicatechin-(4β→6)-epicatechin-(2β→O→7, 4β→8)-epicatechin-(4β→8)-epicatechin, epicatechin-(2β→O→7, 4β→8)-epicatechin-(4β→8)-catechin, respectively.