Phytoecdysteroid constituents from Cyanotis arachnoidea

Abstract

Four phytoecdysteroids that have only 19 or 21 carbons, named 11α-hydroxyrubrosterone (1), dihydroxyrubrosterone (2), rubrosterone (3) and poststerone (4), were isolated from the whole plant of Cyanotis arachnoidea C.B. Clarke. Among them, 1 was a new compound. Their structures were elucidated by spectroscopic methods.

Keywords:

• Commelinaceae
• Phytoecdysteroids
• 11α-Hydroxyrubrosterone

Acknowledgements

Special thanks are due to the Analytical Detection Center, Shenyang Pharmaceutical University, for recording the optical rotation, EI-MS and NMR spectra. We also thank Professor Chun-quan Xu for plant identification.