Platinum-Catalyzed, Terminal-Selective C(sp<sup>3</sup>)–H Oxidation of Aliphatic Amines
作者:Melissa Lee、Melanie S. Sanford
DOI:10.1021/jacs.5b09099
日期:2015.10.14
C(sp(3))-H oxidation of aliphatic amines without the requirement for directing groups. CuCl2 is employed as a stoichiometric oxidant, and the reactions proceed in high yield at Pt loadings as low as 1 mol%. These transformations are conducted in the presence of sulfuric acid, which reacts with the amine substrates in situ to form ammonium salts. We propose that protonation of the amine serves at least
本通讯描述了脂肪胺的终端选择性、Pt 催化的 C(sp(3))-H 氧化,无需定向基团。CuCl2 用作化学计量氧化剂,在 Pt 负载量低至 1 mol% 的情况下,反应以高产率进行。这些转化是在硫酸存在下进行的,硫酸与胺底物原位反应形成铵盐。我们建议胺的质子化至少起到三个重要作用:(i)它使底物可溶于水性反应介质中;(ii) 它限制胺氮与 Pt 或 Cu 的结合;(iii) 它以电子方式使靠近氮中心的 CH 键失活。我们证明该策略对各种伯胺、仲胺和叔胺的终端选择性 C(sp(3))-H 氧化是有效的。