Three isoflav-3-enes and a 2-arylbenzofuran from the root bark of Erythrina burtti

From the root bark of Erythrina burttii three isoflav-3-enes, 7,4'-dihydroxy-2'-methoxy-6-(1,1-dimethylallyl)isoflav-3-ene (trivial name, burttinol-A), 4'-hydroxy-2'-methoxy-2,2-dimethylpyrano[5,6:8,7]isoflav-3-ene (trivial name, burttinol-B), 7,4'-dihydroxy- 2'-methoxy-8-(3,3-dimethylallyl)isoflav-3-ene (trivial name, burttinol-C), and 2-arylbenzofuran, 6,4'-dihydroxy-2'-methoxy-5-(1,1-dimethylallyl)-2-arylbenzofuran (trivial name, burttinol-D) were isolated. In addition, the known compounds, abyssinone V-4'-methyl ether, bidwillol A, calopocarpin, erybraedin A, erythrabyssin II, isobavachalcone, phaseollidin and phaseollin were identified, The structures were determined on the basis of spectroscopic evidence. (C) 2002 Published by Elsevier Science Ltd.