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Structurally Unique Biflavonoids from Selaginella chrysocaulos and Selaginella bryopteris
Author(s) -
Swamy Ramalla Chidananda,
Kunert Olaf,
Schühly Wolfgang,
Bucar Franz,
Ferreira Daneel,
Rani Vanapatla Swarupa,
Kumar Bobbala Ravi,
Appa Rao Achanta Venkata Narasimha
Publication year - 2006
Publication title -
chemistry and biodiversity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.427
H-Index - 70
eISSN - 1612-1880
pISSN - 1612-1872
DOI - 10.1002/cbdv.200690044
Subject(s) - biflavonoids , amentoflavone , chemistry , stereochemistry , circular dichroism , biochemistry
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.