Polarity reversal induced by electrochemically generated thiazol-2-ylidenes: The Stetter reaction
作者:Monica Orsini、Isabella Chiarotto、Giovanni Sotgiu、Achille Inesi
DOI:10.1016/j.electacta.2010.01.082
日期:2010.4
inversion of the normal reactivity (umpolung) of aldehydes has been induced via N-heterocyclic carbenes (NHCs) thiazol-2-ylidenes 2a or 3a, generated by simple electrolyses of solutions containing thiazolium salt 2 or 3. Accordingly, 1,4-dicarbonyl compounds have been obtained, in mild conditions and in moderate to very high yields, via 1,4-addition of the Breslow intermediates to the suitable Michael
醛的正常反应性(化学式)的转化是通过N-杂环卡宾(NHCs)噻唑-2-亚基2a或3a引起的,该反应是通过简单电解含噻唑鎓盐2或3的溶液而产生的。因此,通过将Breslow中间体的1,4-加成到合适的迈克尔受体上,在温和的条件下以中等至非常高的产率获得了1,4-二羰基化合物。该过程已在经典有机溶剂(VOC)和室温离子液体(RTIL)中进行。已经强调了脂族醛与芳族和杂芳族醛之一的不同反应性。