A new cassane diterpenoid from the seeds of Caesalpinia decapetala

Abstract

Phytochemical investigation on the seeds of Caesalpinia decapetala led to the isolation of a new cassane diterpenoid with an unusual O bridge between C-19 and C-20, named phanginin Q (1), together with three known cassane diterpenoids, caesaljapin (2), caesaldekarin A (3), and caesaldekarin B (4). The structure of the new compound was elucidated by spectroscopic methods, including ¹H NMR, ¹³C NMR, HSQC, ¹H − ¹H COSY, HMBC, NOESY, and HR-ESI-MS.

Keywords::

• Fabaceae
• Caesalpinia decapetala
• cassane diterpenoid
• structure elucidation

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This research was financially supported by the National Natural Science Foundation of China [grant number 81403088], Fundamental Research Funds for the Central Public Welfare Research Institutes [grant number ZZ070838], Project Funded by China Postdoctoral Science Foundation [grant number 2013M541160], Fundamental Research Funds for the Self-selected Topic Project of China Academy of Chinese Medical Sciences [grant number ZZ2014042], and Special Fund for TCM supported by State Administration of Traditional Chinese Medicine [grant number 2015468002-4].