Leguminosae, Erythrina, Pterocarpans, Isoflavans, Phytoalexins Two new phytoalexins isolated from the fungus-inoculated leaflets of Erythrina sandwicensis have been identified as (—)-6aS; 11 aS-3,6 a,9-trihydroxy-10-isopentenylpterocarpan (sandwicarpin) and (—)-6a/?; 11 a^-3-hydroxy-9-methoxy-10-isopentenylpterocaipan (sandwicensin). These compounds co-occur with several known pterocarpan (demethylmedicarpin, 3,6a,9-trihydroxypterocarpan, phaseollidin and cristacarpin) and isoflavan (demethylvestitol and isovestitol) deriva tives. The preparation and spectral (UV, MS) characteristics of 3-methoxy-9-hydroxy-10-isopentenylpterocarpan are also described.
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