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