Synthesis of Substituted 3-Hydroxy-2-Furanone Derivatives via an Unusual Enolate Wittig Rearrangement/Alkylative Cyclization Sequence
作者:Renata K. Everett、John P. Wolfe
DOI:10.1021/ol4009188
日期:2013.6.21
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
用二烷基硼三氟甲磺酸酯和Hünig碱处理O-(炔基甲基)乙醇酸甲酯衍生物会导致形成高度取代的3-羟基-2-呋喃酮衍生物。转化似乎是通过不寻常的机理进行的,该机理涉及硼酸酯烯酸酯的最初的2,3-Wittig重排,然后进行烷基化环化反应,从而导致硼试剂中的烷基结合到产物中。