Three new prenylated isoflavonoids from the root bark of Erythrina vogelii

Phytochemical investigation of the CH2Cl2 extract of Erythrina vogelii led to the isolation of five isoflavonoids. Three prenylated isoflavonoids are new natural compounds. The isolation of the antifungal compounds was monitored by inhibition of the growth of Cladosporium cucumerinum in a direct TLC bioautographic assay. The structures of these compounds were elucidated by spectroscopic techniques.