Copyright © 2004 Elsevier Ltd All rights reserved.
Synthesis and structure–activity relationships of 2-vinylchroman-4-ones as potent antibiotic agents
Received 6 August 2004;
revised 10 December 2004;
accepted 17 December 2004.
Available online 14 January 2005.
Abstract
A series of novel 2-vinylchroman-4-ones, analogues of the natural products Aposphaerin A and B, were identified as potent antibiotics. Derivatives exhibit a significant activity against multiresistant strains of S. aureus, such as MRSA (methicillin resistant S. aureus). The 2-vinylchroman-4-ones were efficiently prepared by Lewis acid mediated conjugate addition of vinylmagnesium bromide to chromones.
Keywords: Antibiotics; Chromanones; Natural product analogues; Oxygen heterocycles; Pharmacological screening
Article Outline
- 1. Introduction
- 2. Chemistry
- 3. Pharmacological screening
- 4. Experimental
- 4.1. General procedure for the preparation of 2-vinylchroman-4-ones (3a–h)
- 4.2. 2-Vinylchroman-4-one (3a)
- 4.3. 6-Chloro-2-vinylchroman-4-one (3b)
- 4.4. 6-Methyl-2-vinylchroman-4-one (3c)
- 4.5. 6-Methoxy-2-vinylchroman-4-one (3d)
- 4.6. 3-Bromo-2-vinylchroman-4-one (3e)
- 4.7. 6-Bromo-2-vinylchroman-4-one (3f)
- 4.8. 6-Chloro-7-methyl-2-vinylchroman-4-one (3g)
- 4.9. 7-Hydroxy-2-vinyl-chroman-4-one (3h)
- 4.10. 7-Trimethylsilyloxychromone (1h)
- 4.11. 2-Phenylethynylchroman-4-one (3i)
- 4.12. 2-Ethylchroman-4-one (3j)
- 4.13. (Z)-1-(2-Hydroxyphenyl)-penta-2,4-dien-1-one (4a)
- 4.14. 1-(4-Benzyloxy-2-hydroxyphenyl)-penta-2,4-dien-1-one (4b)
- 4.15. (Z)-1-(2-Hydroxyphenyl)-2-methylpenta-2,4-dien-1-one (4c)
- 4.16. Pharmacological screening
- 4.17. Assay for antimicrobial and antifungal activity
- 5. Determination of minimal inhibitory concentrations of compounds by dilution method
- Acknowledgements
- References






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