Isoflavonoids and triterpenoids isolated from Pterodon polygalaeflorus

Abstract

The isoflavonoids 6,7-dimethoxy-3?,4?-methylenodioxy-, 4?-hydroxy-3?,6,7-trimethoxy-, 3,4,6,7-tetramethoxy-, 7-hydroxy-6-methoxy-3,4-methylenodioxy-, 2?,6,7-trimethoxy-3?,4?-methylenedioxy-, 2?,3?,4?,6,7-pentamethoxy- and 2?,4?,5,6,7-pentamethoxyisoflavone, together with the triterpenoids lupeol and betulin and 4-methoxybenzoic acid, were isolated from acetone extracts of the sapwood and heartwood of Pterodon polygalaeflorus. The structures of these natural products have been characterized by spectrometric methods, mainly extensive 1D and 2D NMR experiments, which were also used for complete assignments of the chemical shifts of the hydrogen and carbon-13 atoms of isoflavonoids.

Keywords

• Pterodon polygalaeflorus
• Leguminosae
• isoflavonoids
• triterpenoids
• ¹H- and 13C-NMR data