Structurally unique biflavonoids from Selaginella chrysocaulos and Selaginella bryopteris.
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.
Swamy
Ramalla Chidananda
RC
University College of Pharmaceutical Sciences, Kakatiya University, Warangal-506 009, A.P., India.
Kunert
Olaf
O
Schühly
Wolfgang
W
Bucar
Franz
F
Ferreira
Daneel
D
Rani
Vanapatla Swarupa
VS
Kumar
Bobbala Ravi
BR
Appa Rao
Achanta Venkata Narasimha
AV
D005419:Flavonoids / Q000737:chemistry* / Q000302:isolation & purification*; D015394:Molecular Structure; D035261:Plant Components, Aerial; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification; D032503:Selaginellaceae
D005419:Flavonoids; D010936:Plant Extracts