Jarrahpour AA, Shekarriz M, Taslimi A. Synthesis and antimicrobial activity of some new sugar-based monocyclic beta-lactams.
Molecules 2004;
9:29-38. [PMID:
18007409 PMCID:
PMC6147349 DOI:
10.3390/90100029]
[Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2003] [Revised: 08/22/2003] [Accepted: 09/07/2003] [Indexed: 11/16/2022] Open
Abstract
The syntheses of some new sugar-based monocyclic beta-lactams possessing several other functionalities in addition to the carbohydrate moiety are described. The key step was the Staudinger [2+2] cycloaddition of chiral carbohydrate Schiff base 5 with phthalimidoacetyl chloride to yield the sugar-based monocyclic beta-lactam 6 as a single isomer. Treatment of protected beta-lactams 6 and 8 with methylhydrazine afforded the free amino beta-lactams 9 and 10. Acylation of these free amino beta-lactams with benzoyl, phenoxyacetyl, cinnamoyl and phenylacetyl chloride in the presence of pyridine afforded beta-lactams 11a-d and 12a-d. Some of these novel beta-lactams were found to be active against Staphilococcus citrus, Klebsiella pneumoniae, Escherichia coli and Bacillus subtilis.
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