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Total synthesis of pyranicin
1KTH Chemistry, Organic Chemistry, SE-100 44 Stockholm, Sweden.
Organic Letters
|January 14, 2005
Summary
This study presents a stereocontrolled synthesis of pyranicin, an annonaceous acetogenin. Key intermediates were accessed using asymmetric Horner-Wadsworth-Emmons reactions and other advanced synthetic methodologies.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
- Natural Product Synthesis
Background:
- Annonaceous acetogenins are a class of natural products with potential biological activities.
- Pyranicin is a specific annonaceous acetogenin requiring complex synthetic strategies.
Purpose of the Study:
- To develop a stereocontrolled convergent synthesis of pyranicin (1).
- To establish efficient methods for constructing key structural motifs of pyranicin.
Main Methods:
- Asymmetric Horner-Wadsworth-Emmons (HWE) reactions for intermediate synthesis.
- Asymmetric desymmetrization of a meso-dialdehyde to form the tetrahydropyran core.
- Stereoconvergent synthesis of the butenolide fragment via kinetic HWE resolution and Pd-catalyzed allylic substitution.
- Carreira's asymmetric acetylide addition for installing the C10/C15 1,6-diol motif.
Main Results:
- Successful stereocontrolled convergent synthesis of pyranicin (1).
- Efficient construction of the tetrahydropyran derivative (2).
- Stereoselective formation of the butenolide fragment.
- Installation of the characteristic C10/C15 1,6-diol motif.
Conclusions:
- The presented synthetic route provides a reliable method for accessing pyranicin.
- The study highlights the utility of asymmetric HWE reactions and other modern synthetic techniques in complex molecule synthesis.