Hawaiian plant studies. Part XVI. Coumarins and flavones from Pelea barbigera(gray) hillebrand (rutaceae)

Abstract

One sample of the endemic Hawaiian rutaceous shrub Pelea barbigera has yielded the known coumarins scopoletin (1a), marmesin (2), and psoralene (3a), and another collection yielded p-hydroxybenzaldehyde, a new furocoumarin 2-(1-hydroxy-1-methylethyl)-4-methoxyfuro[3,2-g][1]benzopyran-7-one (4), and two new flavones 5-hydroxy-3,7,8-trimethoxy-2-(3,4-methylenedioxyphenyl)-1-benzopyran-4-one (5a) and 5-hydroxy-3,6,7,8-tetramethoxy-2-(3,4-methylenedioxyphenyl)-1-benzopyran-4-one (6).