New phenolics from Dianella ensifolia

Abstract

Phytochemical investigation and chromatographic separation of extracts from the aerial parts of Dianella ensifolia (L.) DC. (synonym Dianella nemorosa Lam. Ex. Schiler f.) led to the isolation of 10 compounds, the structures of which were determined by HR-ESI-MS and 1 D- and 2 D-NMR spectroscopies, and by comparisons with published studies. Among the isolated compounds were three flavans, a biflavan, a biflavone, a tetralone, a naphthalen glycoside, an aromatic compound, and two steroids. Six of these were known chemicals, while three were identified as new compounds: 7-acetyl-4R,8-dihydroxy-6-methyl-1-tetralone, 2(S),2′,4′-dihydroxy-7-methoxyflavan, and diaensi-biflavan. 2(S),7,4’-dimethoxy flavan was obtained for the first time as a natural product.

Graphical Abstract

Keywords:

• Dianella ensifolia
• tetralone
• flavan
• biflavan

Acknowledgements

We are indebted to the National Foundation for Science & Technology Development (NAFOSTED) of Vietnam for the financial support of this work (code: 104.01-2016.30). We thank Mr. Tran Thai Vinh for plant identification.

Disclosure statement

No potential conflict of interest was reported by the author.