Antifungal diastereomeric furanones from Mutisia friesiana: Structural determination and conformational analysis
Two diastereomeric furanones, (4S,5S)-5-(4′-methhyl-3′-pentenyl)-4-hydroxy-5 -methyldihydrofuran-2-one 1 and (4S,5R)-5-(4′-methyl-3′-pentenyl)-4-hydroxy -5-methyldihydrofuran-2-one 2 were isolated for the first time from the shrub Mutisia friesiana. The relative stereochimistries 1 and 2 were ascert...
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| Autores principales: | , , , |
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| Formato: | JOUR |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_09574166_v12_n7_p991_Viturro |
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| Sumario: | Two diastereomeric furanones, (4S,5S)-5-(4′-methhyl-3′-pentenyl)-4-hydroxy-5 -methyldihydrofuran-2-one 1 and (4S,5R)-5-(4′-methyl-3′-pentenyl)-4-hydroxy -5-methyldihydrofuran-2-one 2 were isolated for the first time from the shrub Mutisia friesiana. The relative stereochimistries 1 and 2 were ascertained from NOESY NMR data. Comparison between experimental and calculated 1H-1H vicinal coupling constants revealed that both furanones exist in an equilibrium of two stable conformers of the five-membered ring. Application of Mosher's method suggests that both diastereomeric furanones have the same (S)-configuration at C-(4) and are epimers at C-(5). Furanones 1 and 2 showed antifungal activity against the pathogenic fungus Cladosporium cucumerinum. © 2001 Elsevier Science Ltd. |
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