Rodríguez-Berríos RR, Torres G, Prieto JA. Stereoselective VO(acac)(2) Catalyzed Epoxidation of Acyclic Homoallylic Diols. Complementary Preparation of C2-syn-3,4-Epoxy Alcohols.
Tetrahedron 2011;
67:830-836. [PMID:
21311601 DOI:
10.1016/j.tet.2010.11.079]
[Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A substrate-controlled stereoselective epoxidation of free and monoprotected homoallylic diols was developed. This second-generation approach is based on the incorporation of a primary hydroxy directing group at the C2 methyl carbon, which changes the nature of the vanadium ester intermediate providing a new diastereoselectivity manifold for the preparation of 3,4-epoxy alcohols. This modification favored the formation of the challenging C2-syn epoxy alcohol product not previously available using the standard homoallylic alcohol substrates. These new epoxy alcohol diastereomers expand the scope and generality for the utilization of 3,4-epoxy alcohols as precursors for stereoselective polypropionate synthesis.
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