Abstract
Treatment of methyl O-(alkynylmethyl) glycolate derivatives with dialkylboron triflates and Hünig's base leads to the formation of highly substituted 3-hydroxy-2-furanone derivatives. The transformations appear to proceed via an unusual mechanism involving initial 2,3-Wittig rearrangement of a boron ester enolate followed by an alkylative cyclization reaction that leads to incorporation of an alkyl group from the boron reagent into the product.
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