Acetylated anthraquinone glycosides from Cassia obtusifolia

Abstract

Three new acetylated anthraquinone glycosides (1–3) were isolated from the seed of Cassia obtusifolia, together with one parent anthraquinone glycoside (1a). Their structures were determined on the basis of spectroscopic methods and physicochemical properties as obtusifoline-2-O-β-d-2, 6-di-O-acetylglucopyranoside (1), obtusifoline-2-O-β-d-glucopyranoside (1a), obtusifoline-2-O-β-d-3, 6-di-O-acetylglucopyranoside (2), and obtusifoline-2-O-β-d-4, 6-di-O-acetylglucopyranoside (3).

Keywords:

• Leguminosae
• Cassia obtusifolia
• acetylated anthraquinone glycosides
• spectroscopic methods

Acknowledgements

Special thanks are due to the Analytical Center, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, for measurements of the mass and NMR spectra.