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Four new chromones, phomochromenones D-G ( 1 - 4 ), along with four known analogues, diaporchromone A ( 5 ), diaporchromanone C ( 6 ), diaporchromanone D ( 7 ), and phomochromenone C ( 8 ), were isolated from the culture of Phomopsis asparagi DHS-48 from Chinese mangrove Rhizophora mangle . Their structures were elucidated on the basis of comprehensive spectroscopic analysis. The absolute configurations of 1 and 4 were assigned on the basis of experimental and calculated electronic circular dichroism (ECD) data, and those of enantiomers 2 and 3 were determined by a modified Mosher's method and basic hydrolysis. To the best of our knowledge, phomochromenones D-F ( 1 - 4 ) possessing a 3-substituted-chroman-4-one skeleton are rarely found in natural sources. Diaporchromone A ( 5 ) showed moderate to weak immunosuppressive activity against T and/or B lymphocyte cells with IC 50 of 34 μM and 117 μM.

Four New Chromones from the Endophytic Fungus Phomopsis asparagi DHS-48 Isolated from the Chinese Mangrove Plant Rhizophora mangle