AbstractHere we report the use of a base metal complex [(tBupyrpyrr2)Fe(OEt2)] (1‐OEt2) (tBupyrpyrr22−=3,5‐tBu2‐bis(pyrrolyl)pyridine) as a catalyst for intermolecular amination of Csp3−H bonds of 9,10‐dihydroanthracene (2 a) using 2,4,6‐trimethyl phenyl azide (3 a) as the nitrene source. The reaction is complete within one hour at 80 °C using as low as 2 mol % 1‐OEt2 with control in selectivity for single C−H amination versus double C−H amination. Catalytic C−H amination reactions can be extended to other substrates such as cyclohexadiene and xanthene derivatives and can tolerate a variety of aryl azides having methyl groups in both ortho positions. Under stoichiometric conditions the imido radical species [(tBupyrpyrr2)Fe=N(2,6‐Me2‐4‐tBu‐C6H2)] (1‐imido) can be isolated in 56 % yield, and spectroscopic, magnetometric, and computational studies confirmed it to be an S = 1 FeIV complex. Complex 1‐imido reacts with 2 a to produce the ferrous aniline adduct [(tBupyrpyrr2)FeNH(2,6‐Me2‐4‐tBu‐C6H2)(C14H11)}] (1‐aniline) in 45 % yield. Lastly, it was found that complexes 1‐imido and 1‐aniline are both competent intermediates in catalytic intermolecular C−H amination.
摘要我们在此报告使用碱金属配合物[(tBupyrpyrr2)Fe(OEt2)] (1-OEt2) (tBupyrpyrr22-=3,5-tBu2-bis(pyrrolyl)pyridine) 作为催化剂,以 2,4,6- 三甲基苯基叠氮化物 (3 a) 作为芘源,对 9,10- 二氢蒽 (2 a) 的 Csp3-H 键进行分子间胺化。使用低至 2 mol % 的 1-OEt2 在 80 °C 下一小时内即可完成反应,并可控制单 C-H amination 与双 C-H amination 的选择性。催化 C-H amination 反应可扩展到其他底物,如环己二烯和呫吨衍生物,并可容忍在两个正交位置都有甲基的各种芳基叠氮化物。在化学计量条件下,可以分离出亚胺基物种[(tBupyrpyrr2)Fe=N(2,6-Me2-4-tBu-C6H2)](1-亚胺),产率为 56%,光谱、磁力和计算研究证实它是一种 S = 1 的 FeIV 复合物。络合物 1-imido 与 2 a 反应生成亚铁苯胺加合物[(tBupyrpyrr2)FeNH(2,6-Me2-4-tBu-C6H2)(C14H11)}](1-苯胺),产率为 45%。最后,研究发现 1-imido 和 1-aniline 复合物都是催化分子间 C-H amination 的有效中间体。