Abstract

Erysotramidine, erytharbine, and 11-hydroxyerysotrine are three new Erythrina alkaloids, which have been isolated from Erythrina arborescens ROXB. (Leguminosae) along with erysodine (IV), N-nororientaline (V), erybidine (VI), erysotrine (VII) and erythratidine (VIII). Chemical and spectral investigations have been shown that erysotramidine, erytharbine, and 11-hydroxyerysotrine have the stereostructures (I), (II) and (III), respectively. It is interesting that the isolation of srysotramidine and erytharbine. from this plant is the first examples of the natural Erythrina alkaloids containing an amide group.

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