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■ A New γ-Butenolide Glycoside from the Root of Styphnolobium japonicum

Takahiro Utsumi, Ryuichiro Suzuki,* Hitoshi Kamauchi, Sae Misawa, Masashi Kitamura, Yoshiaki Sugita, and Yoshiaki Shirataki

*Pharmacognosy and Natural medicies, Faculty of Pharmaceutical Sciences, Josai University, 1-1 Keyakidai, Sakado, Saitama 350-0295, Japan

Abstract

A new γ-butenolide glycoside, named styphonoloside A (1), was isolated from the root of Styphonolobium japonicum (L.) Schott (= Sophora japonica L.), together with saikoisoflavonoside A (2) and sophoraside A (3). The structure of 1 was characterized as puerol B 2”-O-neohesperidoside based on one- and two-dimensional (1D and 2D) NMR, MS, and electronic circular dichroism (ECD) spectral data. The absolute configuration of the aglycone moiety of 1 was assigned by comparing its experimental ECD spectrum with the calculated ECD spectrum.