A Novel Heterodimer from Crotalaria ferruginea

Abstract

A new compound was isolated from the traditional Chinese folk herb Crotalaria ferruginea. The structure of the new compound was identified as (±)-crotaferruphenol (1) based on analyses of its spectroscopic data including NMR, MS, and specific rotation values. (±)-Crotaferruphenol was a novel heterodimer characteristic of a unique spiroketal moiety, which was produced by the condensation reaction of a chromanone and a 2-isopropenybenzofuran. (±)-Crotaferruphenol exhibited inhibitory activity (IC₅₀ = 6.57 μM.) against phosphodiesterase-4 (PDE4), a drug target for the treatment of chronic obstructive pulmonary disease and asthma.

Keywords

Leguminosae Crotalaria ferruginea Chromanone 2-Isopropenybenzofuran PDE4

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