ERYTHRINA STUDIES .30. SIGMOIDIN-J AND SIGMOIDIN-K, 2 NEW PRENYLATED ISOFLAVONOIDS FROM ERYTHRINA-SIGMOIDEA

In addition to the two known compounds neorautenol [2] and erythrinass inate B [4], two new compounds, an isoflavanone named sigmoidin J [1] and a coumestan derivative named sigmoidin K [3], have been isolated a nd characterized from the root bark of the Cameroonian medicinal plant Erythrina sigmoidea. Their structures have been established as 7,4' d ihydroxy-2',5'-dimeehoxy-6-(gamma,gamma-dimethy [1] and 3,9-dihydroxy- 2,10-(gamma,gamma dimethylallyl) coumestan [3], respectively, by spect roscopic techniques and from chemical evidence.