Atmospheric oxidative catalyst-free cross-dehydrogenative coupling of aldehydes with N -hydroxyimides
作者:Xiaohe Xu、Pingping Li、Yingyi Huang、Chuo Tong、YiYan Yan、Yuanyuan Xie
DOI:10.1016/j.tetlet.2017.03.064
日期:2017.5
Cross-dehydrogenative coupling (CDC) reactions of aldehydes with N-hydroxyimidates such as N-hydroxysuccinimide (NHSI), N-hydroxyphthalimide (NHPI) under catalyst-free conditions is described. Moreover, the desired products can be obtained simply by recrystallization from ethanol. This method is also applicable to the synthesis of amides in excellent yields. A radical mechanism of the type shown in
描述了在无催化剂条件下醛与N-羟基亚氨酸酯如N-羟基琥珀酰亚胺(NHSI),N-羟基邻苯二甲酰亚胺(NHPI)的交叉脱氢偶联(CDC)反应。而且,所需的产物可以简单地通过从乙醇中重结晶而获得。该方法也适用于以优异的产率合成酰胺。基于在TEMPO存在下的反应抑制,提出了方案4中所示类型的自由基机理。