Thiourea-based hydrogen bond donor has been recently disclosed by our group to be an efficient organocatalyst for cross-dehydrogenative coupling (CDC) reactions. Here we present a detailed mechanistic study of this reaction using NMR spectroscopy and kinetic isotope effect experiment. The results revealed that α-amino peroxide is the true intermediate within the catalytic cycle, formed via a thiourea-catalyzed
我们小组最近公开了基于
硫脲的氢键供体,它是用于交叉脱氢偶联(CDC)反应的有效有机催化剂。在这里,我们介绍使用NMR光谱和动力学同位素效应实验对该反应进行详细的机理研究。结果表明,α-
氨基过氧化物是催化循环中真正的中间体,是通过
硫脲催化的速率决定氢原子转移(HAT)过程形成的。这些实验研究不仅为
硫脲催化的CDC反应机理提供了一些见识,而且还促进了它们的进一步应用。