Diterpenoids from Acacia leucophloea: revision of the structures of leucophleol and leucophleoxol.
The pimarane-type structures previously suggested for leucophleol (1) and leucophleoxol (2), two diterpenoids isolated from Acacia leucophloea, must be amended to the isopimarane-type derivatives 5 and 6, respectively. These corrections were supported on NMR spectroscopic studies and, in the case of 6, by an X-ray diffraction analysis. Moreover, the unpublished complete and unambiguous (1)H and (13)C NMR assignments of 5 and 6 together with those of leucoxol (3), another diterpenoid from the same plant, are also reported.
del Carmen Apreda Rojas
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Departamento de Cristalografía, Instituto de Química Física "Rocasolano", Consejo Superior de Investigaciones Científicas (CSIC), Serrano 119, E-28006 Madrid, Spain.
Cano
F H
FH
Rodríguez
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B
D000045:Acacia / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D015394:Molecular Structure; D010946:Plants, Medicinal / Q000737:chemistry*
D004224:Diterpenes; C435258:leucophleol; C435259:leucophleoxol; C435260:leucoxol