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Original Article

Phenanthrene derivatives from the stems and leaves of Dioscorea nipponica Makino

Original article

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Pages 1-6 | Received 20 Aug 2009, Accepted 21 Oct 2009, Published online: 01 Feb 2010
 

Abstract

From the CHCl3-soluble portion of the 70% EtOH extract of the stems and leaves of Dioscorea nipponica Makino, two new phenanthrenes, 7-hydroxy-2,3,5-trimethoxy-9,10-dihydrophenanthrene (1) and 2,2′,7,7′-tetrahydroxy-4,4′,6,6′-tetramethoxy-1,1′-biphenanthrenes (2), as well as three known phenanthrenes, 6-methoxycoelonin (3), 4,7-dihydroxy-2,3,6-trimethoxyphenanthrene (4), and 3,7-dihydroxy-2,4,6-trimethoxyphenanthrene (5), were isolated. The structures were determined by means of HR-MS, 1H NMR, 13C NMR, and HMBC experiments.

Acknowledgement

We are very grateful to Chun-Yu Wang (Key Laboratory for Supramolecular Structure and Materials of Ministry of Education, Jilin University) for the measurement of NMR.

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