α-Haloenol Acetates: Versatile Reactants for Oxetan-2-one, Azetidin-2-one and Isoxazolidin-5-one Synthesis
作者:Romain Bejot、Siddam Anjaiah、J. R. Falck、Charles Mioskowski
DOI:10.1002/ejoc.200600708
日期:2007.1
ketene equivalents, namely α-haloenol acetates, are investigated as both nucleophilic and electrophilic reactants in a tandem aldol–lactonization reaction. Diethylaluminum ethoxide proves to be an efficient promoter for the aldol reaction with a wide range of substrates, including inter alia, aldehydes, ketones, imines, nitrones and oximes, leading to oxetan-2-ones, azetidin-2-ones and isoxazolidin-5-ones
新的烯酮等价物,即α-卤代烯醇乙酸酯,在串联醛醇-内酯化反应中作为亲核和亲电反应物进行了研究。乙醇二乙基铝被证明是与多种底物(尤其包括醛、酮、亚胺、硝酮和肟)发生羟醛反应的有效促进剂,可生成 oxetan-2-ones、azetidin-2-ones 和 isooxazolidin-5 -那些。所得杂环加合物是许多感兴趣的化合物中的常见结构元素,也是制备其他官能团的关键中间体。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)