Two new ent-kaurane diterpenoids from Pteris semipinnata

Abstract

In this study, two new compounds and six known compounds were isolated from the aerial parts of Pteris semipinnata. The chemical structures of these two new compounds were elucidated as 6β,11α-dihydroxy-15-oxo-ent-kaur-16-en-19-oic acid (1) and 7α,11α-dihydroxy-15-oxo-ent-kaur-16-en-19-oic acid (2) by the extensive spectral methods including 2D NMR and HR-MS techniques.

Keywords::

• Pteris semipinnata
• ent-kaurane
• diterpenoid

Acknowledgments

The authors thank National Natural Science Foundation of China (81274047 and 81202589) and Program for Liaoning Excellent Talents in University (LJQ2011095) for financial support.

Notes

^1. These two authors contributed equally to this work.