Prenylated Isoflavonoids from the Root Bark of Erythrina vogelii

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Abstract
Four new prenylated isoflavonoids, vogelins D−G (1−4), were isolated from the CH2Cl2 extract of Erythrina vogelii root bark in addition to the known compounds isolupalbigenin (5), ficuisoflavone (6) , ulexone (7), isochandalon (8), and isoderrone (9). The structures 1−4 were elucidated by spectroscopic and chemical methods. The absolute configuration of compound 1 was determined on the basis of its CD spectrum. Possible biogenetic relationships among the E. vogelii isoflavonoids are briefly discussed.