Mechanistic Studies on the Rh(III)-Mediated Amido Transfer Process Leading to Robust C–H Amination with a New Type of Amidating Reagent
作者:Yoonsu Park、Kyung Tae Park、Jeung Gon Kim、Sukbok Chang
DOI:10.1021/jacs.5b01324
日期:2015.4.8
bearing an amidating reagent was achieved, its facile conversion to an amido-inserted rhodacycle allowed for a clear picture on the C-H amidation process. The newly developed amidating reagent of 1,4,2-dioxazol-5-ones was applicable to a broad range of substrates with high functional group tolerance, releasing carbon dioxide as a single byproduct. Additional attractive features of this amino source, such
对 Cp*Rh(III) 催化的直接 CH 胺化反应的机理研究使我们揭示了 1,4,2-dioxazol-5-one 及其衍生物作为高效氨基来源的新用途。CN 键形成过程的逐步分析表明,铑金属中心与酰胺化试剂或底物的竞争性结合与反应效率密切相关。在该系列中,观察到 1,4,2-二恶唑-5-酮对阳离子 Rh(III) 具有很强的亲和力,与叠氮化物相比,酰胺化效率显着提高。动力学和计算研究表明,1,4,2-dioxazol-5-one 的高酰胺化反应性除了高配位能力外,还可归因于亚氨基插入过程的低活化能。虽然实现了带有酰胺化试剂的阳离子 Cp*Rh(III) 复合物的表征,但它可以轻松转化为插入酰胺基的红丹环,从而可以清楚地了解 CH 酰胺化过程。新开发的 1,4,2-二恶唑-5-酮酰胺化试剂适用于具有高官能团耐受性的广泛底物,释放二氧化碳作为单一副产物。这种氨基源的其他吸引人的特点,例如与相