1997•Journal of Natural ProductsRequires access

Biflavonoids of Calophyllum venulosum

Shugeng Cao, Keng‐Yeow Sim, Swee‐Hock Goh

Abstract

Four new biflavonoids [pyranoamentoflavone 7,4‘‘‘-dimethyl ether ( 1 ), pyranoamentoflavone 7,4‘-dimethyl ether ( 2 ), 6‘‘-(3-methyl-2-butenyl)amentoflavone ( 3 ), and 6‘‘-(2-hydroxy-3-methyl-3-butenyl)amentoflavone ( 4 )], as well as three known biflavonoids, [pyranoamentoflavone ( 5a ), amentoflavone ( 6 ), and 2,3-dihydroamentoflavone ( 7 )] have been isolated from the leaves of Calophyllum venulosum . The structures of the new compounds were established by spectroscopic data and chemical modification.

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Key concepts: Biflavonoids, Pharmacognosy, Traditional medicine, Chemistry, Stereochemistry, Medicine, Biological activity, Biochemistry