Tannins and Related Compounds. L. Structures of Proanthocyanidin A-1 and Related Compounds

GEN-ICHIRO NONAKA; SATOSHI MORIMOTO; JUN-EI KINJO; TOSHIHIRO NOHARA; ITSUO NISHIOKA

doi:10.1248/cpb.35.149

GEN-ICHIRO NONAKA, SATOSHI MORIMOTO, JUN-EI KINJO, TOSHIHIRO NOHARA, ITSUO NISHIOKA

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Keywords: proanthocyanidin A-1, A-type proanthocyanidin, chemical correlation, epimerization, enantiomer, diastereoisomer, polyphenol, flavan-3-ol, catechin

JOURNAL FREE ACCESS

1987 Volume 35 Issue 1 Pages 149-155

DOI https://doi.org/10.1248/cpb.35.149

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Abstract

The structures of proanthocyanidin A-1 (2) and two related proanthocyanidins, tentatively named A-4 (3) and A-5' (4), have been established unambiguously on the basis of spectroscopic evidence and chemical correlations with the structurally known proanthocyanidin A-2 (1). Chemical transformation of singly linked proanthocyanidin B-1 (6) into 2 also confirmed the stereostructure of 2.

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