Flavonoids of Lonchocarpus montanus A.M.G. Azevedo and biological activity.

The analysis of root extracts from Lonchocarpus montanus A.M.G.

New prenylated metabolites of Deguelia longeracemosa and evaluation of their antimicrobial potential.

The analysis of root extracts from Deguelia longeracemosa (Benth.) A.M.

Swartziarboreol diterpenes from Swartzia langsdorffii Raddi.

Two new swartziarboreol diterpenes (1 and 2) and swartziarboreol C were isolated from the petroleum ether extract of the roots of Swartzia langsdorffii. Their structures were elucidated by spectroscopic evidence. The biological activity of the root extracts and 2 was evaluated through bioautography and brine shrimp lethality assays.

Flavonoids from Lonchocarpus muehlbergianus.

The light petroleum extract from the roots of Lonchocarpus muehlbergianus Hassl contained nine flavonoids, including six new ones. These are 2,4-cis-2,4,5,8-tetramethoxy-(2'',3'':6,7)-furanoflavan; 2,4-cis-4-hydroxy-2,5,8-trimethoxy-(2'',3'':6,7)-furanoflavan; 2,4-cis-2-prenyloxy-4,5,8-trimethoxy-(2'',3'':6,7)-furanoflavan; 2,4-cis-2-prenyloxy-4-hydroxy-5,8-dimethoxy-(2'',3'':6,7)-furanoflavan; 2',5',6'-trimethoxy-9-(1,1-dimethylallyoxy)-[2'',3'':3',4']-furanochalcone; 5,6-dimethoxy-(2'',3'':7,8)-furanoflavone, identified by analysis of their spectral data (UV, IR, 1H and 13C NMR, 2D-NMR, NOE and MS). The natural occurrence of 2,4-dioxygenated flavan derivatives is being reported for the first time.