Heteroscorpionate ligands of the bis(pyrazolyl)methane family have been applied in the stabilisation of terminal copper tosyl nitrenes. These species are highly active intermediates in the copper‐catalysed direct C−H amination and nitrene transfer. Novel perfluoroalkyl‐pyrazolyl‐ and pyridinyl‐containing ligands were synthesized to coordinate to a reactive copper nitrene centre. Four distinct copper
activity and the mechanism of di-iron catalysts for aziridination of styrenes using phenyltosyliodinane (PhINTs). In addition, we have developed a similar mono-iron catalyst which operates under the same mechanism albeit with a reduced activity. DFT calculations were performed to investigate the structure and electronic structure of the FeIVNTs species of the latter catalyst. They suggest that the reaction
Expedient Synthesis of 2‐Iminothiazolidines via Telescoping Reactions Including Iron‐Catalyzed Nitrene Transfer and Domino Ring‐Opening Cyclization (DROC)
作者:Guillaume Coin、Oriane Ferrier de Montal、Patrick Dubourdeaux、Jean‐Marc Latour
DOI:10.1002/ejoc.202001379
日期:2021.1.22
In this work, iron‐catalyzed aziridination (nitrene transfer) is combined in a single process to aziridine ring opening (DROC) to produce 2‐iminothiazolidines which constitute interesting cores of pharmaceuticals.
Nickel-Catalyzed Enantioselective Reductive Cross-Coupling of Styrenyl Aziridines
作者:Brian P. Woods、Manuel Orlandi、Chung-Yang Huang、Matthew S. Sigman、Abigail G. Doyle
DOI:10.1021/jacs.7b03448
日期:2017.4.26
to asymmetric catalysis using a chiral bioxazolineligand for Ni. The process allows facile access to highly enantioenriched 2-arylphenethylamines from racemic aziridines. Multivariate analysis revealed that ligand polarizability, among other features, influences the observed enantioselectivity, shedding light on the success of this emerging ligand class for enantioselective Ni catalysis.
报道了一种 Ni 催化的苯乙烯基氮丙啶与芳基碘化物的还原交叉偶联。该反应通过立体会聚机制进行,因此适用于使用 Ni 的手性生物恶唑啉配体进行不对称催化。该过程允许从外消旋氮丙啶轻松获得高度对映体富集的 2-芳基苯乙胺。多变量分析表明,配体极化率等特征会影响观察到的对映选择性,揭示了这种新兴配体类别在对映选择性 Ni 催化方面的成功。
A Versatile Tripodal Cu(I) Reagent for C–N Bond Construction via Nitrene-Transfer Chemistry: Catalytic Perspectives and Mechanistic Insights on C–H Aminations/Amidinations and Olefin Aziridinations
作者:Vivek Bagchi、Patrina Paraskevopoulou、Purak Das、Lingyu Chi、Qiuwen Wang、Amitava Choudhury、Jennifer S. Mathieson、Leroy Cronin、Daniel B. Pardue、Thomas R. Cundari、George Mitrikas、Yiannis Sanakis、Pericles Stavropoulos
DOI:10.1021/ja503869j
日期:2014.8.13
intermediates play a major role and are generated by hydrogen-atom abstraction from substrate C-H bonds or initial nitrene-addition to one of the olefinic carbons. Subsequent processes include solvent-caged radical recombination to afford the major amination and aziridination products but also one-electron oxidation of diffusively free carboradicals to generate amidination products due to carbocation