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doi:10.1016/j.bmc.2004.12.031    
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Copyright © 2004 Elsevier Ltd All rights reserved.

Synthesis and structure–activity relationships of 2-vinylchroman-4-ones as potent antibiotic agents

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Uwe Albrechta, Michael LalkCorresponding Author Contact Information, b and Peter LangerCorresponding Author Contact Information, a, , E-mail The Corresponding Author

aInstitut für Chemie und Biochemie, Ernst-Moritz-Arndt-Universität, Soldmannstr. 16, D-17487 Greifswald, Germany

bInstitut für Pharmazie, Ernst-Moritz-Arndt-Universität Greifswald, Jahnstr. 17, D-17487 Greifswald, Germany


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.

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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 (3ah)
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
5.1. Sample preparation
5.2. Culture of micro-organisms
5.3. Antibacterial assay
Acknowledgements
References





Corresponding Author Contact InformationCorresponding authors. Tel.: +49 3834 864461; fax: +49 3834 864373 (P.L.)
 Address: Institut für Chemie, Universität Rostock, Albert-Einstein-Str. 3a, D-18051 Rostock, Germany.

 
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