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Synfacts 2019; 15(05): 0517
DOI: 10.1055/s-0037-1611489
DOI: 10.1055/s-0037-1611489
Metals in Synthesis
The Jacobsen Epoxidation
Further Information
Publication History
Publication Date:
15 April 2019 (online)
Significance
Although manganese-catalyzed enantioselective epoxidation of nonactivated alkenes had been previously described by Jacobsen (J. Am. Chem. Soc. 1990, 112, 2801) and Katsuki (Tetrahedron: Asymmetry 1991, 2, 481), this report was the first general and highly enantioselective method to achieve this transformation. When compared to the Sharpless epoxidation, this method does not require allylic alcohols and works best with cis-alkenes.
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Comment
Jacobsen found that by optimizing the size of the salen ligand, the approach of the olefin towards the metal center could be controlled. Thus, the bulky tert-butyl groups on the aromatic rings of the salen ligand limit the chance of competing approaches to the substrate.
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