A Class of N–O-Type Oxidants To Access High-Valent Palladium Species
作者:Manuel Nappi、Matthew J. Gaunt
DOI:10.1021/acs.organomet.8b00712
日期:2019.1.14
capable of oxidizing palladacycle(II) complexes to high-valent palladium species, promoting the formation of C–N bonds in stoichiometric and catalytic conditions. The weak N–O bond and the extremely electron-withdrawing benzenesulfonate group on the oxygen atom of the oxidant are crucial moieties to ensure the desired activity. The oxidation mechanism could involve outer-sphere single-electron transfer
Palladium-catalysed C–H activation of aliphatic amines to give strained nitrogen heterocycles
作者:Andrew McNally、Benjamin Haffemayer、Beatrice S. L. Collins、Matthew J. Gaunt
DOI:10.1038/nature13389
日期:2014.6.5
highlighted through the development of C−H amination and carbonylation processes, leading to the synthesis of aziridines and β-lactams (respectively), and is suggestive of a generic C−H functionalization platform that could simplify the synthesis of aliphatic secondary amines, a class of small molecules that are particularly important features of many pharmaceutical agents.
Mechanistic investigation into the C(sp<sup>3</sup>)–H acetoxylation of morpholinones
作者:Cornelia S. Buettner、Darren Willcox、Ben. G. N. Chappell、Matthew J. Gaunt
DOI:10.1039/c8sc03434f
日期:——
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 bondformation 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
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。
Heterocyclic alkoxyamines as regulators in controlled radical polymerization processes
申请人:——
公开号:US20030125494A1
公开(公告)日:2003-07-03
The present invention is aimed at a process for controlled polymerization of ethylenically unsaturated monomers in the presence of heterocyclic sterically hindered alkoxyamine compounds. The intermediate N-oxyl derivatives, a composition of the N-oxyl derivatives with ethylenically unsaturated monomers and a free radical initiator, as well as a process for polymerization are also subjects of the present invention. Still further subjects of the invention are novel amine precursors and a novel process for manufacturing 5-ring heterocyclic amines.