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A copper-promoted coupling of vinyl pinacol boronate esters and alcohols for the synthesis of enol ethers is reported. The reaction occurs in 50-99% yield and is compatible with a variety of functional groups. Cupric acetate is the copper source, and triethylamine buffer is used to prevent protodeboration; the reaction occurs at room temperature. In addition to excellent chemoselectivity, the reaction is stereospecific.
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Shade et al. (2010) studied this question.
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