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Mechanistic investigation into the C(sp3)–H acetoxylation of morpholinones†
Chemical Science ( IF 8.4 ) Pub Date : 2018-10-01 00:00:00 , DOI: 10.1039/c8sc03434f
Cornelia S. Buettner 1, 2, 3, 4 , Darren Willcox 1, 2, 3, 4 , Ben. G. N. Chappell 1, 2, 3, 4 , Matthew J. Gaunt 1, 2, 3, 4
Affiliation  

The study of a selective palladium(II)-catalyzed C(sp3)–H acetoxylation reaction on a class of cyclic alkyl amines is reported. Computational modelling and kinetic studies were used to provide support for a mechanism involving selective C–O bond formation from a γ-aminoalkyl-Pd(IV) intermediate. The C–O bond forming step was computed to occur by a dissociative ionization mechanism followed by an SN2 process involving external acetate attack at the C–Pd(IV) bond. This pathway was computed to be of lowest energy with no competing C–N products observed. Additionally, with a few modifications to reaction conditions, preliminary studies showed that this process could be rendered enantioselective in the presence of a non-racemic BINOL-phosphoric acid.

中文翻译:

吗啉酮 C(sp 3)-H乙酰氧基化的机理研究

报道了对一类环状烷基胺的选择性钯(II)催化的C(sp 3)-H乙酰氧基化反应的研究。计算模型和动力学研究被用来为涉及由γ-氨基烷基-Pd(IV)中间体选择性形成C-O键的机理提供支持。C–O键形成步骤的计算是通过离解电离机理,随后是S N 2过程,涉及C–Pd的外部乙酸盐侵蚀(IV)债券。计算得出该途径的能量最低,没有观察到竞争的C–N产物。另外,对反应条件进行了一些修改,初步研究表明,在非外消旋的BINOL-磷酸存在下,该过程可以使对映选择性。
更新日期:2018-10-01
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