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http://dx.doi.org/10.5012/jkcs.2010.54.3.261

Organic Synthesis Based on Ruthenium Carbene Catalyzed Metathesis Reactions and Pyridinium Salt Photochemistry  

Cho, Dae-Won (Department of Chemistry and Chemical Biology, College of Arts and Sciences, University of New Mexico)
Mariano, Patrick S. (Department of Chemistry and Chemical Biology, College of Arts and Sciences, University of New Mexico)
Publication Information
Journal of the Korean Chemical Society / v.54, no.3, 2010 , pp. 261-268 More about this Journal
Abstract
In this account, three synthetic methodologies that serve as the basis for new strategies for the preparation of selected natural products are briefly introduced. One process, involving ruthenium carbene catalyzed ring rearrangement metathesis developed by Grubbs and his coworkers, transforms alkene-tethered cycloalkenes to thermodynamically more favored alkene-tethered cycloalkenes. Another ruthenium carbene promoted reaction, referred to as dienyne metathesis, was uncovered in early studies by Grubbs and his collaborators. This process converts dienynes to fused bicyclic conjugated dienes. Finally, a novel photo-electrocyclization reaction of pyridinium salts, which leads to the formation of 4-aminocyclopenten-3,5-diol derivatives, is discussed. Examples are provided to show the utility of these methodologies in natural product synthesis. Emphasis is given to studies in which pyridinium salt photochemistry is coupled with ring rearrangement and dienyne metathesis in routes for the synthesis of polyhydroxyalted indolizidine alkaloids and the construction of the tricyclic core of the lepadiformine and cylindricine alkaloids.
Keywords
Ring rearrangement metathesis; Dienyne metathesis; Photochemistry; Natural product synthesis;
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