Tannins and Related Compounds. LVI. Isolation of Four New Acylated Flavan-3-ols from Oolong Tea. (1)

Abstract

A chemical examination of the aqueous acetone extract of commercial oolong tea has led to the isolation of four new acylated flavan-3-ols 1—4, together with the known compounds 5—13. On the basis of chemical and spectroscopic evidence, compounds 1—4 have been characterized as (–)-epiafzelechin 3-O-gallate (1), (–)-epicatechin 3-O-(4-O-methyl)-gallate (2), (–)-epicatechin 3-O-p-hydroxybenzoate (3) and (–)-epigallocatechin 3-O-cinnamate (4). © 1987, The Pharmaceutical Society of Japan. All rights reserved.