New prenylated metabolites of Deguelia longeracemosa and evaluation of their antimicrobial potential.
The analysis of root extracts from Deguelia longeracemosa (Benth.) A.M.G. Azevedo yielded fifteen prenylated metabolites. Nine of them are novel, and their molecular structures were determined through spectral analyses (UV, IR, MS and NMR) as being five derivatives of 4-hydroxy-3-phenylcoumarin: 4-hydroxy-3-(4'-hydroxyphenyl)-5-methoxy-6-(8',9'-epoxy-9'-methylbutyl)-2'',2''-dimethylpyrano-(5'',6'':8,7)-coumarin; 4-hydroxy-3-(3',4'-methylenedioxyphenyl)-5-methoxy-6-(3,3-dimethylallyl)-2'',2''-dimethypyrano-(5'',6'':8,7)-coumarin; 4-hydroxy-3-(3'-hydroxy-4'-methoxyphenyl)-5-methoxy-6-(3,3-dimethylallyl)-2'',2''-dimethylpyrano-(5'',6'':8,7)-coumarin; 4-hydroxy-3-(3'-hydroxy-4'-methoxyphenyl)-5-methoxy-2'',2''-dimethylpyrano-(5'',6'':6,7)-coumarin and 4-hydroxy-3-[4'-O-(3,3-dimethylallyl)phenyl]-5-methoxy-2'',2''-dimethylpyrano-(5'',6'':6,7)-coumarin, three derivatives of 1,2-diphenyl-1,2-ethanodione (alpha-oxodeoxybenzoin derivatives): 1-[6-hydroxy-2-methoxy-3-(3,3-dimethylallyl)-2'',2''-dimethylpyrano-(5'',6'':5,4)- ]-2-(4'-hydroxyphenyl)-1,2-ethanedione; 1-[6-hydroxy-2-methoxy-2'',2''-dimethylpyrano-(5'',6'':3,4)]-2-(4'-methoxyphenyl)-1,2-ethanedione; 1-[6-hydroxy-2-methoxy-2'',2''-dimethylpyrano-(5'',6'':3,4)]-2-(3',4'-methylenedioxyphenyl)-1,2-ethanedione and one derivative of deoxybenzoin: 2,4'-dimethoxy-6-hydroxy-2'',2''-dimethylpyrano-(5'',6'':3,4)-deoxybenzoin. The antimicrobial activity of roots extracts and some isolated compounds was screened through bioautography against bacteria and fungi.
Organic Chemistry Department, Chemistry Institute, UNICAMP, Campinas, São Paulo, Brazil. aderbal@iqm.unicamp.br
Aderbal F
AF
Magalhães
Ana Maria G A
AM
Tozzi
Eva G
EG
Magalhães
Lourdes C
LC
Souza-Neta
D000890:Anti-Infective Agents / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D006801:Humans; D008826:Microbial Sensitivity Tests; D033641:Millettia / Q000378:metabolism; D003904:Mitosporic Fungi / Q000187:drug effects; D008517:Phytotherapy; D010936:Plant Extracts / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D018517:Plant Roots; D017368:Protein Prenylation
D000890:Anti-Infective Agents; D010936:Plant Extracts