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Novel methodologies for the synthesis of functionalized pyroglutamates
Srinivas Tekkam1, M A Alam, Subash C Jonnalagadda
1Department of Chemistry and Biochemistry, University of Minnesota Duluth, 1039 University Drive, Duluth, MN 55812, USA.
Chemical Communications (Cambridge, England)
|February 15, 2011
Summary
Researchers developed new methods for synthesizing pyroglutamates using Baylis-Hillman chemistry. These reactions create valuable intermediates for complex fused lactone structures.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
Background:
- Amino-acid derived iminoesters are versatile building blocks.
- Baylis-Hillman (BH) chemistry offers unique reactivity for carbon-carbon bond formation.
Purpose of the Study:
- To develop novel synthetic routes to substituted pyroglutamates.
- To apply these methods for the construction of fused lactone ring systems.
Main Methods:
- Alkylation of amino-acid derived iminoesters with BH-template based allyl bromides.
- Alkylation of amino-acid derived iminoesters with BH-derived allylic acetates.
Main Results:
- Synthesis of α-methylene-β-substituted-pyroglutamates.
- Synthesis of α-alkylidene-pyroglutamates.
- Application in the synthesis of fused [3.2.0]-γ-lactam-β-lactones.
Conclusions:
- The developed alkylation strategies provide efficient access to functionalized pyroglutamates.
- These pyroglutamate derivatives serve as key intermediates for complex fused lactone synthesis.
