Flavanone, triterpene and chromene derivatives from the stems of Paramignya griffithii

Five compounds, including three that are novel, were isolated from the stem s of Paramgnya griffithii (Rutaceae). Two new and one known prenylated flav anones were characterized as 3',4'-dihydroxy-7-methoxy-8-(3-methylbut-2enyl )-furano (4",5":6,5)-flavanone, 3',3',4'-dihydroxy-7-methoxy-8-(3-methlbut- 2-enyl)-2"-(1-hydroxy-1 -methylethyl)-furano (4",5":6,5)-flavanone and amor adicin. In addition, a triterpene, 3-oxo-tirucalla-7,24-diene-21-al, and a novel chromene, 6-(2-hydroxyethyl)-2,2-dimethyl-2H-1-benzopylan, were ident ified. (C) 2000 Elsevier Science Ltd. All rights reserved.