Base-Promoted [3+2]-Annulation of Oxime Esters and Aldehydes for Rapid Isoxazoline Formation
作者:Huawen Huang、Feifei Li、Zhenhua Xu、Jinhui Cai、Xiaochen Ji、Guo-Jun Deng
DOI:10.1002/adsc.201700730
日期:2017.9.18
A base‐promoted [3+2]‐annulation of ketoxime esters and aldehydes is disclosed for the facile and rapid synthesis of 3,5‐disubstituted and 3,4,5‐trisubstituted isoxazolines. The key to our success is the pivalate leaving group of the oxime substrates, combined with cesium carbonate as promoter. This chemistry allows the assembly of a vast array of isoxazoline derivatives under simple base conditions
公开了一种碱促进的酮肟酯和醛的[3 + 2]环化反应,可轻松快速地合成3,5-二取代和3,4,5-三取代的异恶唑啉。我们成功的关键是肟底物的新戊酸酯离去基团,结合碳酸铯作为促进剂。这种化学方法可以在简单的碱性条件下以与传统的异恶唑啉互补的方法组装大量异恶唑啉衍生物,该方法是通过[3 + 2]-偶极环加成丁腈氧化物和烯烃而形成的。它也代表了一种新的反应模式,涉及亲电胺化/ N-O键取代。