We herein report an iron-catalyzed direct diazidation method via activation of bench-stable peroxyesters promoted by nitrogen-based ligands. This method is effective for a broad range of olefins and N-heterocycles, including those that are difficult substrates for the existing olefin diamination and diazidation methods. Notably, nearly a stoichiometric amount of oxidant and TMSN₃ are sufficient for high-yielding diazidation for most substrates. Preliminary mechanistic studies elucidated the similarities and differences between this method and the benziodoxole-based olefin diazidation method previously developed by us. This method effectively addresses the limitations of the existing olefin diazidation methods. Most notably, previously problematic nonproductive oxidant decomposition can be minimized. Furthermore, X-ray crystallographic studies suggest that an iron–azide–ligand complex can be generated in situ from an iron acetate precatalyst and that it may facilitate peroxyester activation and the rate-determining C–N₃ bond formation during diazidation of unstrained olefins.

中文翻译：

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氮基配体促进的过氧酯活化铁催化的直接烯烃重氮化

我们在此报告了一种铁催化的直接重氮化方法，该方法通过活化基于氮的配体促进的板凳稳定的过氧酯来实现。该方法对于广泛的烯烃和N-杂环是有效的，包括那些对于现有烯烃渗醛和重氮化方法而言是困难的底物的烯烃和N-杂环。值得注意的是，几乎化学计量的氧化剂和TMSN ₃对于大多数基材来说，足以进行高产率的叠氮化。初步的机理研究阐明了该方法与我们先前开发的基于苯并二恶唑的烯烃重氮化方法之间的异同。该方法有效地解决了现有烯烃重氮化方法的局限性。最值得注意的是，以前有问题的非生产性氧化剂分解可以减至最少。此外，X射线晶体学研究表明，乙酸铁预催化剂可以原位生成叠氮化铁-配体配合物，并且在未重链烯烃的叠氮化过程中，它可以促进过氧酯的活化和决定速率的C–N ₃键的形成。