Chemical constituents of the combretaceae. Part I. Substituted phenanthrenes and 9,10-dihydrophenanthrenes from the heartwood of Combretum apiculatum
Abstract
Five new compounds isolated from the heartwood of Combretum apiculatum have been shown by chemical and spectroscopic methods, supported by synthesis, to be 4,7-dihydroxy-2,6-dimethoxy-, 4,7-dihydroxy-2,3,6-trimethoxy-, and 2,6-dihydroxy-3,4,7-trimethoxy-9,10-dihydrophenanthrene, and 2,6-dihydroxy-3,4,7-trimethoxy- and 4,6,7-trihydroxy-2,3-dimethoxyphenanthrene.