Two new rearranged abietane diterpenoids from tropical Isodon coetsa

Abstract

Two new rearranged abietane diterpenoids, sincoetsin A (1) and sincoetsin B (2), were isolated from the aerial part of Isodon coetsa (Buth-Ham ex D.Don) Hara collected in Singapore, and their structures were determined by spectroscopic methods, especially 2D NMR techniques.

Keywords:

• Isodon coetsa
• Sincoetsin A
• Sincoetsin B
• Abietane diterpenoids

Acknowledgements

This project was supported by a grant (P-04-12) from the State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany. The author is also grateful to Professor Chang-xiang Chen of Kunming Institute of Botany, Chinese Academy of Sciences.