作者:Shengwen Liang、Michael P. Jensen
DOI:10.1021/om3009102
日期:2012.12.10
Scorpionate complexes of the middle to late 3d transition metals [(L)M(NCMe)(3)](BF4)(n) (M = Mn, Fe, Co, Ni: 1(M), L = tris(3,5-dimethylpyrazol-1-yl)methane, Tpm(Me,Me), n = 2; 2(M), L = tris(3-phenylpyrazol-1-yl)methane, Tpm(Ph), n = 2; 3(M) except 3(Mn), L = hydrotris(3,5-dimethylpyrazol-1-yl)borate, [Tp(Me,Me)](-), n = 1; 4(M), L = hydrotris(3-phenyl-5-methylpyrazol-1-yl)borate, [Tp(Ph,Me)](-), n = 1) were examined as catalysts for styrene aziridination and THF amination using phenyl-N-tosyliodinane as a nitrene donor. [(Tpm(Me,Me))Fe(NCMe)(3)](BF4)(2) (1(Fe)) was identified as the most active catalyst, giving nearly quantitative nitrene transfer yields at 5 mol % loadings. The reactivity of 1(Fe) with a wider range of organic substrates was also explored, and a striking observation was strong selectivity for aromatic rather than benzylic amination for alkylaromatic substrates.