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■ Hydrolyzable Tannins having a Depsidone-forming Valoneoyl Group

Tsutomu Hatano, Osamu Namba, Ling Chen, Taeko Yasuhara, Kazufumi Yazaki, Takashi Yoshida, and Takuo Okuda*

*Faculty of Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Okayama 700-8530, Japan

Abstract

Prostrain C (1) isolated from Euphorbia prostrata, and proecoxims C (2) and D (3) isolated from Stachyurus praecox, were found to be hydrolyzable tannins having a depsidone-forming valoneoyl group as a constituent unit. The orientation of the valoneoyl group in praecoxins C and D as in the structures 2 and 3 was unequivocally proved by the ¹H-¹³C long-range shift correlation spectrum of rugosin C (5) which was chemically correlated with praecoxin C.