A new isocoumarin from Cajanus cajan (Fabaceae)

Abstract

A new isocoumarin, 3-phenyl-8-hydroxy-6-methoxy-5-γ,γ- dimethylallyl-isocoumarin, named cajavilmina (1) and eight known compounds: α-amirenone (2), β- amirenone (3), lupenone (4), 5-hydroxy-7- methoxydihydroflavone (5), longistilin C (6), 3-hydroxy-5-methoxystilbene (7), β-sitosterol (8) and stigmasterol (9) were identified in a dichloromethane fraction from Cajanus cajan leaves. Structures were elucidated by analysis of spectral data, mainly those afforded by 1H, NOEDIFF and 13C NMR (1D and 2D NMR HMQC, HMBC and COSY) and mass spectra.