Two new C-15 enolic acyl phragmalin-type limonoids from Chukrasia tabularis var. velutina

Abstract

Two new C-15 enolic acyl phragmalin-type limonoid orthoesters, chukvelutilide G (1) and chukrasine F (2), were isolated from the stem barks of Chukrasia tabularis var. velutina. Their structures were elucidated by their extensive high resolution-electrospray ionization mass spectrometry (HR-ESI-MS), one- and two-dimensional spectroscopic analysis, including heteronuclear single quantum coherence (HSQC), HMBC and NOESY experiments.

Keywords:

• Chukrasia tabularis var. velutina
• C-15 enolic phragmalin-type limonoid
• orthoester

Acknowledgements

This research work was supported by the Key Project of National Natural Science Foundation of China (Grant No. 30830116) and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.