A Deoxygenative [4+1] Annulation Involving<i>N</i>-Acyldiazenes for an Efficient Synthesis of 2,2,5-Trisubstituted 1,3,4-Oxadiazole Derivatives
作者:Rong Zhou、Ling Han、Honghui Zhang、Rongfang Liu、Ruifeng Li
DOI:10.1002/adsc.201700935
日期:2017.11.23
+ 1] annulation of N-acyldiazenes with α-dicarbonyl compounds such as isatins, α-keto esters, and α-diketones is reported. The annulation reactions proceed smoothly under mild conditions to deliver a broad range of 2,2,5-trisubstituted 1,3,4-oxadiazole derivatives in moderate to excellent yields from readily available starting materials. It represents the first realization of the [4+1] annulation mode
前所未有的,高效的三(二甲基氨基)膦[P(NMe 2)3 ]介导的N-酰基二氮烯与α-二羰基化合物(如靛红,α-酮酸酯和α-二酮)的脱氧[4 +1]环化反应报告。在温和的条件下,环化反应可顺利进行,从容易获得的起始原料中以中等至极好的收率提供各种2,2,5-三取代的1,3,4-恶二唑衍生物。它代表了[4 + 1]环化模式的第一个实现,该模式涉及N-酰基二氮烯以构建五元杂环。