Construction of 2-Pyrone Skeleton via Domino Sequence between 2-Acyl-1-Chlorocyclopropanecarboxylate and Amines
作者:Yuequan Zhu、Yuefa Gong
DOI:10.1021/jo502502z
日期:2015.1.2
A base-promoted domino reaction of 2-acyl-1-chlorocyclopropaneformic esters with amines is described. In the presence of inorganic bases like Cs2CO3 or Mg(OEt)2, the reaction proceeded smoothly in acetonitrile to afford 2-pyrone derivatives in modest to excellent yields (up to 97%). This reaction provides a straightforward and transition metal-free protocol to efficiently construct 2-pyrone skeleton
描述了2-酰基-1-氯环丙烷甲酸酯与胺的碱促进的多米诺反应。在无机碱如Cs 2 CO 3或Mg(OEt)2的存在下,反应在乙腈中顺利进行,以适中至优异的收率(最高97%)提供了2-pyrone衍生物。该反应提供了一种直接且无过渡金属的方案,可以有效地构建2-吡喃酮骨架。建议一种可能的机理,涉及氯化氢的1,2-消除,氮杂-迈克尔加成,开环和分子内内酯化,以使目标2-吡喃酮衍生物的形成合理化。
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