ortho-C-alkylation of unprotected anilines with a variety of styrenes and alkenes using a univalent cationic indium(I) catalyst is reported. Mechanistic studies revealed that the reaction likely proceeds via a tandem hydroamination/Hofmann–Martius rearrangement. The high compatibility between the cationic indium(I) complex and primary anilines led us to develop an In(I)+-catalyzed hydroamination of alkenes
Experimental and Computational Studies of the Mechanisms of Hydroamination/Cyclisation of Unactivated α,ω-Amino-alkenes with CCC-NHC Pincer Zr Complexes
作者:Wesley D. Clark、Katherine N. Leigh、Charles Edwin Webster、T. Keith Hollis
DOI:10.1071/ch15779
日期:——
[2 + 2] cycloaddition mechanisms, were modelled computationally at the PBEPBE level of theory with double-zeta quality basis sets. The formation of a catalytically relevant imido complex via the monoamido complexes was accompanied by in situ formation of ammonium salts of the substrates. The experimental and computational data are consistent with an imido-[2 + 2] cycloaddition mechanism for the CCC-NHC pincer
Synthesis of Pyrrolidines and Pyrroles by Tandem Amination/Cyanation/Alkylation and Amination/Oxidation Sequences
作者:Junbin Han、Zhichao Lu、Gerald B. Hammond、Bo Xu
DOI:10.1002/ejoc.201402748
日期:2014.9
amine-tethered alkyne 1, a copper-catalyzed three-component tandem amination/cyanation/alkylation sequence gives alpha-CN pyrrolidine 6 in good yield and regioselectivity. Also, a silver mediated tandem amination/oxidation of a secondary amine-tethered alkyne 7 produces functionalized pyrrole 8 in good yield. All reactions were conducted in one pot without any protection/deprotection steps.
CCC-NHC Pincer Zr Diamido Complexes: Synthesis, Characterisation, and Catalytic Activity in Hydroamination/Cyclisation of Unactivated Amino-Alkenes, -Alkynes, and Allenes
作者:Henry U. Valle、Gopalakrishna Akurathi、Joon Cho、Wesley D. Clark、Amarraj Chakraborty、T. Keith Hollis
DOI:10.1071/ch15795
日期:——
previously reported methodology. The reactivity of 3 and 4 in hydroamination/cyclisation is reported. Both diamido complexes have been found to improve catalytic activity as compared with the previously reported mono-amido analogues. Complexes 3 and 4 were observed to be selective for primary amines over secondary amines in hydroamination/cyclisation. The lack of reactivity with secondary amines is
A comprehensive mechanistic study by means of complementary experimental and computational approaches of the exo‐cyclohydroamination of primary aminoalkenes mediated by the recently reported β‐diketiminatoiron(II) complex B is presented. Kinetic analysis of the cyclisation of 2,2‐diphenylpent‐4‐en‐1‐amine (1 a) catalysed by B revealed a first‐order dependence of the rate on both aminoalkene and catalyst
通过互补试验和的计算方法的装置的综合机理研究外由最近报道β-diketiminatoiron介导的初级aminoalkenes的-cyclohydroamination(II)络合物乙呈现。由B催化的2,2-二苯基五-4-烯-1-胺(1 a)环化的动力学分析表明,速率对氨基烯烃和催化剂浓度的一级依赖性以及一次动力学同位素效应(KIE) (k H / k D)为2.7(90°C)。得到的Eyring分析Δ ħ ≠ = 22.2千卡摩尔-1,Δ小号≠ = -13.4 CAL摩尔-1 K -1。直接分子内加氢胺化和氧化胺化的竞争途径的合理的机械途径已通过计算进行了仔细研究。在存在明显较快的σ插入途径的情况下,动力学上质子辅助的协调一致的N / C / H键形成非插入途径被认为是不可及的。此手术途径涉及1)快速和可逆的顺式烯烃进入Fe-N系列的-migratory 1,2-插入酰氨σ键在单体N