Chattapadhyay Deepta, Aydogan Akin, Doktor Katarzyna, Maity Arunava, Wu Jiun Wei, Michaudel Quentin
Department of Chemistry, Texas A&M University, College Station, Texas, 77843, United States.
ACS Catal. 2023 Jun 2;13(11):7263-7268. doi: 10.1021/acscatal.3c01981. Epub 2023 May 15.
While among the most common functional handles present in organic molecules, amines are a widely underutilized linchpin for C-C bond formation. To facilitate C-N bond cleavage, large activating groups are typically used but result in the generation of stoichiometric amounts of organic waste. Herein, we report an atom-economic activation of benzylic primary amines relying on the Sulfur(VI) Fluoride Exchange (SuFEx) click chemistry and the -Ramberg-Bäcklund reaction. This two-step sequence allows the high-yielding generation of 1,2-dialkyldiazenes from primary amines via loss of SO. Excitation of the diazenes with blue light and an Ir photocatalyst affords radical pairs upon expulsion of N, which can be coaxed into the formation of C(sp)-C(sp) bonds upon diffusion and capture by a Ni catalyst. This arylative strategy relying on a traceless click approach was harnessed in a variety of examples and its mechanism was investigated.
虽然胺是有机分子中最常见的官能团之一,但在C-C键形成方面,它们是一种未被充分利用的关键基团。为了促进C-N键的断裂,通常会使用大的活化基团,但这会产生化学计量的有机废物。在此,我们报道了一种基于硫(VI)氟交换(SuFEx)点击化学和-Ramberg-Bäcklund反应的苄基伯胺的原子经济性活化方法。这个两步过程允许通过失去SO从伯胺高产率地生成1,2-二烷基二氮烯。用蓝光和Ir光催化剂激发二氮烯会在排出N时产生自由基对,这些自由基对在扩散并被Ni催化剂捕获后可被诱导形成C(sp)-C(sp)键。这种基于无痕点击方法的芳基化策略在多个实例中得到应用,并对其机理进行了研究。