Two new grayanane diterpenoids from the flowers of Rhododendron molle

Abstract

A phytochemical investigation of the flowers of Rhododendron molle has yielded two new grayanane diterpenoids, rhodomolleins F and G (1, 2). Compounds 1 and 2 possessed an oxo-bridge between C-5 and C-9, and their structures were elucidated on the basis of interpretation of spectroscopic data, including 1D and 2D NMR techniques.

Keywords:

• Ericaceae
• Rhododendron molle
• grayanane diterpenoid
• rhodomolleins F and G

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos 21062008, 20962013), the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20095314110001), and the Fund of State Key Laboratory of Phytochemistry and Plant Resources in West China (No. P2009-KF05).