Chemical Components from Ceratostigma willmottianum

Investigation on the whole plant of Ceratostigma willmottianum for bioactive compounds has led to the identification of 15 compounds. Two of them were characterized as new compounds, plumbolactones A (5-(2,3-dihydroxyphenyl)dihydro-4-methyl-2(3 H )-furanone, 1 ) and B (3-(1,2-dihydroxypropyl)-5-hydroxy-1(3 H )-isobenzofuranone, 2 ), while the other 13 were known compounds, plumbagic acid ( 3 ), isoshinanolone, epiisoshinanolone, plumbagin ( 4 ), N - trans -caffeoyltyramine, N - trans -feruloyltyramine, myricetin, quercetin, tricetin 3‘,5‘-dimethyl ether, vanillic acid, syringic acid, caffeic acid, and 6,7-dihydroxycoumarin. The structures of the new compounds were assigned by 2D-NMR techniques.