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Volumn 74, Issue 13, 2009, Pages 4772-4781

Asymmetric synthesis, structure, and reactivity of unexpectedly stable spiroepoxy-β-lactones including facile conversion to tetronic acids: Application to (+)-maculalactone A

Author keywords

[No Author keywords available]

Indexed keywords

ACID CHLORIDES; ALKYLIDENE; ANOMERIC EFFECT; ANTIFOULING AGENTS; ASYMMETRIC SYNTHESIS; CHEMICAL EQUATIONS; ENANTIOSELECTIVE SYNTHESIS; FACILE CONVERSION; HETEROCYCLES; NATURAL PRODUCTS; OPTICALLY ACTIVE; REACTIVITY PATTERN; SPIROHETEROCYCLES; SYNTHETIC UTILITY; TETRONIC;

EID: 67649610395     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo900499e     Document Type: Article
Times cited : (30)

References (67)
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    • Known, direct methods for β-lactone synthesis from chiral α-oxy aldehydes are either unsuccessful or provide only syn selectivity (see ref 2)
    • Known, direct methods for β-lactone synthesis from chiral α-oxy aldehydes are either unsuccessful or provide only syn selectivity (see ref 2).
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    • (d) For a review describing use of ketenes in asymmetric synthesis, see ref 2d.
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    • The ring strain of epoxides (25.7 kcal/mol) is greater than that of β-lactones (22.6 kcal/mol)
    • The ring strain of epoxides (25.7 kcal/mol) is greater than that of β-lactones (22.6 kcal/mol).
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    • Average O1-C4 bond length for 40 β-lactones found in the Cambridge Structural Database.
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    • 19F NMR spectra
    • 19F NMR spectra.
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    • Synthetic (+)-maculalactone was tested for its ability to inhibit the formation of bacterial biofilms. For Gram-positive bacteria, modest anti-biofilm activity was noted against vancomycin-resistant Enterococcus facium (VRE, ATCC #51559) and methicillin-resistant Staphylococcus aureus (MRSA, ATCC #BAA-44). A dose response study revealed IC50 values of 210 and 290 mM against VRE and MRSA, respectively. Growth curves of each bacterial strain grown in the presence or absence of (+)-maculalactone were identical, thus indicating that activity was driven by a non-microbicidal mechanism. Maculalactone was also screened for its ability to inhibit biofilm development of two Gram-negative strains of bacteria, Pseudomonas aeruginosa (PAO1) and multidrug-resistant Acinetobacter baumannii (ATCC #BAA-1605). However, no antibiofilm activity was noted
    • Synthetic (+)-maculalactone was tested for its ability to inhibit the formation of bacterial biofilms. For Gram-positive bacteria, modest anti-biofilm activity was noted against vancomycin-resistant Enterococcus facium (VRE, ATCC #51559) and methicillin-resistant Staphylococcus aureus (MRSA, ATCC #BAA-44). A dose response study revealed IC50 values of 210 and 290 mM against VRE and MRSA, respectively. Growth curves of each bacterial strain grown in the presence or absence of (+)-maculalactone were identical, thus indicating that activity was driven by a non-microbicidal mechanism. Maculalactone was also screened for its ability to inhibit biofilm development of two Gram-negative strains of bacteria, Pseudomonas aeruginosa (PAO1) and multidrug-resistant Acinetobacter baumannii (ATCC #BAA-1605). However, no antibiofilm activity was noted.


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