DIHYDROCHALCONES, COUMARINS AND ALKALOIDS FROM METRODOREA-NIGRA

Two novel dihydrochalcones, ethoxy-3',5-di-(3,3-dimethylallyl)-dihydro chalcone and trihydroxy-4-methoxy-5-(3,3-dimethylallyl)-3',4-(2 '',2 ' '-dimethyldihydropyran)-dihydrochalone, have been isolated from fresh fruits of Metrodorea nigra. Stems and leaves showed a similar composit ion and we have isolated common steroids, simple coumarins, several fu rocoumarins, furoquinoline alkaloids and a furofuran lignan. From stem s, we have also isolated the pentacyclic 6-C-monoterpenyl-5,7-dioxycou marin, deoxybruceol. Structures of the isolated compounds were elucida ted on the basis of spectral data.