A new cucurbitacin from Bolbostemma paniculatum Franguent

Abstract

A new cucurbitacin with an unusual ring A, isocucurbitacin D 25-O-acetate (1), was isolated from Bolbostemma paniculatum Franguent together with one known compound, cucurbitacin E (2). The structure of new compound was established by spectroscopic methods.

Keywords:

• Bolbostemma paniculatum (Maxim.) Franguent
• Cucurbitacin
• Isocucurbitacin

Acknowledgements

The authors give thanks to Wen Li and Yi Sha of the Analytical Centre of Shenyang Pharmaceutical University for recording the ¹H NMR, ¹³C NMR and 2D NMR spectra. We are grateful to Bin Xin, Department of Instrumental Analysis of Institute, Chemistry of Chinese Academy of Sciences, for the HRESI-MS measurement.