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Published on: February 3, 2017
Structurally unique biflavonoids from Selaginella chrysocaulos and Selaginella bryopteris
Ramalla Chidananda Swamy1, Olaf Kunert, Wolfgang Schühly
1University College of Pharmaceutical Sciences, Kakatiya University, Warangal-506 009, A.P., India.
Abstract:
Chemical investigation of Selaginella chrysocaulos from Northeast India yielded three new (i.e., 1-3) and two known biflavonoids. From Selaginella bryopteris, collected in the southern part of India, one new (11) and eleven known biflavonoids of the amentoflavone- and hinokiflavone-type were isolated and identified. The structures of the compounds were elucidated by 1D- and 2D-NMR spectroscopy, and by mass spectrometry. The absolute configurations of chiral biflavonoids with flavanone subunits (from S. bryopteris) were determined with the aid of circular-dichroism (CD) spectroscopy. Several very rare or even unprecedented substructures in biflavonoids were found.
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