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Hemisynthesis and Bactericidal Activity of Several Substituted Benzoic Acid Esters of 13(S)-Labdan-8α,15-Diol, a Diterpene from Oxylobus glanduliferus

The diterpene 13(S)-labdan-8α,15-diol (1) was isolated in high yield from Oxylobus glanduliferus, a native species of Venezuelan Andean moorlands. Using this compound (1) as a starting material, it was possible to prepare 12 aromatic esters, which were structurally characterized by analysis of their spectroscopic data (IR, 1D and 2D NMR and MS). The bactericidal activity of these diterpene derivatives was evaluated against four bacterial strains [two Gram-positive and two Gram-negative]: Staphylococcus aureus, Enterococcus faecalis, Escherichia coli, and Pseudomonas aeruginosa.

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This work was financially supported by the National Fund of Science, Technology and Innovation (FONACIT) (Grant No. 201300288) within the framework of the Project PCP France-Venezuela and by the CDCHTA-ULA (Grant No. C-1935-15-08-ED). Thanks are due to Eng. Juan Carmona Arzola, Department of Pharmacognosy and Organic Medicaments, Faculty of Pharmacy and Bioanalysis, University of Los Andes (ULA) for identification of plant material.

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Correspondence to Pablo A. Chacon-Morales.

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Published in Khimiya Prirodnykh Soedinenii, No. 4, July–August, 2019, pp. 580–585.

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Chacon-Morales, P.A., Amaro-Luis, J.M., Rojas Fermin, L.B. et al. Hemisynthesis and Bactericidal Activity of Several Substituted Benzoic Acid Esters of 13(S)-Labdan-8α,15-Diol, a Diterpene from Oxylobus glanduliferus. Chem Nat Compd 55, 677–684 (2019).

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  • labdanes
  • substituted benzoic acids
  • esterifications
  • NMR
  • bactericidal activity