在此,我们描述了一种受辅因子启发的氧化方法,其中在有氧条件下使用芳香二酮分子。在光催化条件下,芘二酮通过醇和胺生成酰胺室温下脱氢分子间偶联。该开发方案的合成效用已在涉及各种醇和胺的大量底物上进行了检验,以良好至优异的产率合成仲酰胺和叔酰胺。这是对在非常高的温度下进行的无受体脱氢或脱氢偶联方法之后的多种过渡金属催化方法的显着改进。该反应完全由芘二酮光激发产生的自由基驱动,随后被 KO t还原布。一系列控制反应与中间分离相结合,揭示了操作机制,并确立了半醌酸酯在非常温和的反应条件下引导两个连续脱氢反应的卓越作用。
Co2(CO)8 as a convenient in situ CO source for the direct synthesis of benzamides from aryl halides (Br/I) via aminocarbonylation
作者:Poongavanam Baburajan、Kuppanagounder P. Elango
DOI:10.1016/j.tetlet.2013.12.062
日期:2014.1
mild, and functional group tolerant method for the direct synthesis of benzamides fromarylhalides (Br, I) via aminocarbonylation, using solid Co2(CO)8 as a convenient CO source, has been demonstrated. The developed method is applicable to a wide variety of 1° and cyclic and acyclic 2° amines. Nitro substituted (o, m and p) arylhalides have easily been converted to the corresponding benzamides,