Phytochemical Investigations Of The Stem Bark Of Senna Floribunda And Senna Didymobotrya

Anthraquinones and a naphthoquinone have been isolated and characterized from the stem barks of S. jloribllllda and S. didymobofJya.rnThe CH2CI2:MeOH (1:1) extract of the stem bark of S. jloribllllda yielded fourrnbianthraquinones: floribundone-l (43), 5,7'-physcion-fallacinol (53), 5,7'-physcionphyscionrnanthrone (83), 5,5'-physcion-physcion anthrone (84) along with three commonrnanthraquinones: physcion, chrysophanol and emodin. The isolation of 5,7'-Physcionphyscionrnanthrone and 5,5'-physcion-physcion anthrone is repOlied here for the first time.rnThe CH2CI2:MeOH (1: I) extract of S. didymoboflya bark yielded four compounds: 2-rnmethoxystypandrone (82), 10-( chrysophanol-7'-yl)-1 0-hydroxychrysophanol-9-anthronern(70), fallacinol (6) and 1O,lO'-bichrysophanol (59) along with the three commonrnanthraquinones: physcion, chrysophanol and emodin.rnThe elucidation of the structures was based on spectroscopic data and in some cases byrndirect TLC comparison with authentic samples.

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