Twenty-three flavonoids from Lonchocarpus subglaucescens
1996
Magalhaes, A.F. | Tozzi, A.M.G.A. | Sales, B.H.L.N. | Magalhaes, E.G.
Chemical investigation of Lonchocarpus subglaucescens roots resulted in the isolation of 23 flavonoids, whose structures were elucidated by spectroscopic methods. Ponganone III, ovalichromene B, purpurenone, 12 alpha-hydroxyrotenone, (2,3-trans-3,4-trans)-3,4,5,8-tetramethoxy-[2", 3":7,6]-furanoflavan, 6",6"-dimethylchromeno-[2",3":7,8]-flavone and 3',4'-methylenedioxy-6",6"-dimethylchromeno-[2", 3":7,8]-flavone had been previously isolated from other sources. The 16 new flavonoids are 6-methoxy-6",6"-dimethylchromeno[2",3": 7,8]-flavanone, (2S)-5,6-dimethoxy-[2",3": 7,8]-furanoflavanone, (2R,3R)-3,5,6-trimethoxy-[2",3", 7,8]-furanoflavanonol, 3,4-methylenedioxy-2'- methoxy-6",6"-dimethylchromeno-[2",3": 4',3'] -beta-hydroxychalcone, (Z/E)-3,4-methylenedioxy -2'-methoxy-6",6"-dimethylchromeno-[2",3": 4',3']-9-methoxychalcone, (E)-2'-methoxy 6",6"-dimethylchromeno-[2",3":4',3']-9-methoxychalcone, (2,4-cis)-3',4'-methylenedioxy-4,5,8-trimethoxy-[2",3":7,6]- furanoflavan, (2,4-cis)-4,5,6-trimethoxy- [2",3":7,8]furanoflavan,3,4-dimethoxy-2'- hydroxy-6",6"-dimethylchromeno-[2",3":4',3']-chalcone, 3,4-methylenedioxy-2'-hydroxy-3',6'-dimethoxy-[2",3":4',5'] furanochalcone, (2,3-trans-3,4-cis-3,4,5,6-tetramethoxy-[2", 3":7,8]-furanoflavan, (2,3-trans-3,4-trans)- 3',4'- methylenedioxy-3,4,5,8-tetramethoxy- [2",3":7,6]-furanoflavan, (2,3-trans-3,4-cis)- 3',4'-methylenedioxy-3,4,5,6-tetramethoxy- [2",3":7,8]-furanoflavan,3,4-methylenedioxy- 2'-methoxy-[2",3":4',3']-dihydrochalcone and 3',4'-methylenedioxy-8-methoxy-5-hydroxy -6",6"-dimethylchromeno-[2",3":7,6]-isoflavone.
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