Four new N-contained iridoid glycosides from flower buds of Lonicera japonica

Abstract

Four new N-contained iridoid glycosides, lonijapospiroside A (1), l-phenylalaninosecologanin B (2), l-phenylalaninosecologanin C (3), and dehydroprolinoylloganin A (4), were isolated from the flower buds of Lonicera japonica Thunb. Their structures were established on the basis of UV, IR, MS, and NMR spectral data.

Keywords:

• Lonicera japonica
• Caprifoliaceae
• N-contained iridoid glycosides
• spectroscopic analysis

Acknowledgments

This research program was financially supported by National Science and Technology Project of China (No. 2009ZX09311-004) and The State Key Laboratory of Bioactive Substances and Function of Natural Medicine.