The direct thioesterification of aldehydes with disulfides via NHC-catalyzed carbonyl umpolung strategy
作者:Santosh Singh、Lal Dhar S. Yadav
DOI:10.1016/j.tetlet.2012.07.042
日期:2012.9
(enals) with diaryl disulfides is reported. The protocol involves carbonyl umpolung reactivity of aldehydes and enals in which the carbonyl carbon attacks nucleophilically on diaryl disulfides to afford thioesters and α,β-unsaturated thioesters, respectively. However, aliphatic aldehydes are not suitable substrates for this reaction. No by-product formation, complete atom-economy, shorter reaction time, ambient
报道了一种有效的N-杂环卡宾(NHC)催化醛和α,β-不饱和醛(烯醛)与二芳基二硫化物的直接硫代酯化反应。该方案涉及醛和烯醛的羰基化合物活性,其中羰基碳亲核地攻击二芳基二硫化物,分别得到硫代酸酯和α,β-不饱和硫代酸酯。但是,脂族醛不是该反应的合适底物。没有副产物的形成,完全的原子经济,较短的反应时间,环境温度,操作简便和高收率是本方法的主要特征。