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Synthesis 2017; 49(17): 3952-3956
DOI: 10.1055/s-0036-1588814
DOI: 10.1055/s-0036-1588814
special topic
Remarkable Influence of Cobalt Catalysis on Epoxide Ring-Opening with Sulfoxonium Ylides
Support from The University of Auckland is gratefully acknowledged through the award of doctoral scholarships to M.L.J. and N.Z.B.Further Information
Publication History
Received: 22 March 2017
Accepted after revision: 05 April 2017
Publication Date:
08 May 2017 (online)
Published as part of the Special Topic Cobalt in Organic Synthesis
Abstract
Cobalt demonstrates a remarkable ability to catalytically divert the course of epoxide to oxetane ring expansion via reaction with a sulfoxonium ylide. An expanded survey of transition-metal catalysts has confirmed that cobalt salts uniquely instead deliver homoallylic alcohol products from epoxides, with retention of the original epoxide stereochemistry. The reaction is an unusual example of cobalt-catalysed epoxide ring-opening by a carbon nucleophile. A tandem Corey–Chaykovsky/epoxide olefination sequence giving homoallylic alcohols from aldehydes is further demonstrated along with preliminary mechanistic analysis. This communication summarises current understanding and ongoing studies into this intriguing new cobalt-mediated reactivity.
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