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■ Secoiridoid Glucosides Esterified with a Phenolic Glucoside from Alstonia macrophylla

Atsuko Itoh, Eri Kawaguchi, Sayo Nishio, Kaori Tani, Misaki Uchigaki, Marina Nakamura, Toru Akita, Toyoyuki Nishi, and Takao Tanahashi*

*Kobe Pharmaceutical University, 4-19-1, Motoyamakita-machi, Higashinada-ku, Kobe 658-8558, Japan.

Abstract

Eleven novel secoiridoid glucosides, O-methylfrachinoside (1) and alstomacrosides A–J (2–11) were isolated, together with seventeen known compounds, from the dried twigs of Alstonia macrophylla. The structures of the new compounds were established on the basis of 1D and 2D NMR spectroscopic data. These compounds were commonly characterized as esters of secoxyloganin with a phenolic glucoside.