Imbricatonol, a Naphthol Naphthoquinone Dimer Isolated From Stypandra imbricata and Dianella revoluta

Abstract

A novel naphthol-naphthoquinone dimer (5), presumably biosynthetically derived from the oxidative coupling of dianellidin (2) with stypandrone (4) or by the incomplete oxidation of stypandrol (I), has been isolated from the plants Stypandra imbricata and Dianella remluta. The structure was elucidated by spectroscopic techniques and confirmed by its chemical modification to form dianellinone (3).