Synthesis, Antimicrobial Evaluation, and Structure–Activity Relationship of α-Pinene Derivatives
作者:Preeti Dhar、PuiYee Chan、Daniel T. Cohen、Fadi Khawam、Sarah Gibbons、Teresa Snyder-Leiby、Ellen Dickstein、Prashant Kumar Rai、Geeta Watal
DOI:10.1021/jf403586t
日期:2014.4.23
Several (+)- and (-)-alpha-pinene derivatives were synthesized and evaluated for their antimicrobial activity toward Gram-positive bacteria Micrococcus luteus and Staphylococcus aureus, Gram-negative bacterium Escherichia coli, and the unicellular fungus Candida albicans using bioautographic assays. (+)-alpha-Pinene 1a showed modest activity against the test organisms, whereas (-)-alpha-pinene 1b showed no activity at the tested concentration. Of all the alpha-pinene derivatives evaluated, the beta-lactam derivatives (10a and 10b) were the most antimicrobial. The increase in the antimicrobial activity of 10a compared to la ranged from nearly 3.5-fold (C. albicans) to 43-fold (S. aureus). The mean +/- standard deviation for the zone of inhibition (mm) for 10a (C. albicans) was 31.9 +/- 4.3 and that for S. aureus was 51.1 +/- 2.9. Although (-)-alpha-pinene 1b was not active toward the test microorganisms, the corresponding beta-lactam 10b, amino ester 13b, and amino alcohol 14b showed antimicrobial activity toward the test microorganisms. The increase in the antimicrobial activity of lob compared to 1b ranged from 32-fold (S. aureus) to 73-fold (M. luteus). The mean +/- standard deviation for the zone of inhibition (mm) for 10b (S. aureus) was 32.0 +/- 0.60 and that for M. luteus was 73.2 +/- 0.30.