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Original Articles

New lignan glycosides from Justicia procumbens

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Pages 1-8 | Received 25 May 2016, Accepted 23 Sep 2016, Published online: 21 Oct 2016
 

Abstract

Four new lignan glycosides (14), named procumbenosides I, K, L, and M, together with cleistanthin B (5) reported for the first time in the genus Justicia, and 5 other known arylnaphthalene lignan glycosides (610) were isolated from the whole plant of Justicia procumbens. The structures of the new compounds were elucidated by extensive one-dimensional (1D) and two-dimensional (2D) NMR experiments and mass spectrometry. Procumbenoside M (4) was a rare sesquilignan glycoside never previously reported in the species of Justicia. The paper also provided insight into the conformational equilibria existing in the lignan glycosides of the plant.

Acknowledgements

The authors are really grateful to Mrs Yan Xue and Mrs Mei-feng Xu of the National Center of Biomedical Analysis for the measurements of the HRESIMS and NMR spectra.

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