Reactivity of Electrogenerated N-Heterocyclic Carbenes in Room-Temperature Ionic Liquids. Cyclization to 2-Azetidinone Ring<i>via</i>C-3/C-4 Bond Formation
imidazolium-based room-temperatureionicliquids, related to the acidity of the C-2 imidazolium cation, can be modified via cathodic cleavage of the C-2/hydrogen bond. N-Heterocycliccarbenes, electrogenerated by electrolysis of imidazolium-based room-temperatureionicliquids, are stable bases that are strong enough to deprotonate bromoamides 1a–k yielding the azetidin-2-one ring via C-3/C4 bondformation. The
基于咪唑鎓的室温离子液体的固有化学性质,与C-2咪唑鎓阳离子的酸度有关,可以通过C-2 /氢键的阴极裂解进行修饰。N-杂环卡宾是通过咪唑基室温离子液体的电解而电生成的,是稳定的碱,其强度足以使溴酰胺1a-k去质子化,从而通过C-3 / C 4键形成氮杂环丁烷-2-酮环。β-内酰胺2a-k的电合成已在温和的条件下完成,提高了收率,避免了使用有毒,易挥发的分子溶剂。
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作者:Bari、Sharma、Sethi
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作者:Casadei, Maria Antonietta、Rienzo, Barbara Di、Inesi, Achille、Moracci, Franco Micheletti
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作者:CASADEI, MARIA ANTONIETTA、GESSNER, ANDREAS、INESI, ACHILLE、JUGELT, WERNER、+