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.