Chemical Constituents from Bombacopsis glabra (Pasq.) A. Robyns: Complete ¹H and 13C NMR Assignments and X Ray Structure of 5-Hydroxy-3,6,7,8,4'-pentamethoxyflavone

• DOI: 10.1590/s0103-50532002000200022
• Publication Date: 2005-04-25T10:54:23Z
• Authors: Vanderlúcia F. Paula; Luiz C. A . Barbosa; William Errington; Oliver W. Howarth; Mariluze P. Cruz
• Keywords: Terpene; Hexane

The flavone 5-hydroxy-3,6,7,8,4'-pentamethoxyflavone (1) and the triterpenes lupenone, 9,19-cyclolanost-23-ene-3beta,25-diol (2), (24R)-9,19-cyclolanost-25-ene-3beta,24-diol (3) (24S)-9,19-cyclolanost-25-ene-3beta,24-diol (4) were isolated from hexane extract of stem bark Bombacopsis glabra (Bombacaceae). structures determined by 13C ¹H NMR (1D 2D) mass spectrometry, comparison with literature data for triterpenes. structure 1 was unambiguously confirmed a X-ray diffraction study. five substances first time Bombacaceae species.