New pterocarpenes from Brya ebenus

Authors:
  • MFMargarida A. Ferreira
    Margarida A. Ferreira
  • MMMichael Moir
    Michael Moir
  • RTRonald H. Thomson
    Ronald H. Thomson
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Abstract
Five pterocarpenes (bryacarpenes 1–5) and an isoflavan (bryaflavan) have been isolated from the heartwood of Brya ebenus and identified as 4,10-dihydroxy-3,8,9-trimethoxy-, 10-hydroxy-3,8,9-trimethoxy-, 3,8,9,10-tetramethoxy-, 4-hydroxy-3,9,10-trimethoxy-, and 3,9,10-trimethoxy-6H-benzofuro[3,2-c][1]benzopyran, and (3S)-3′,6,7-trihydroxy-2′,4′-dimethoxyisoflavan. Pterocarpenes and pterocarpans can be oxidised to coumestones, and chromans to coumarins, by using dichlorodicyanobenzoquinone.