α-Diimine transition-metal complexes: Mechanochemistry − A new synthetic approach
摘要:
Preliminary results on the preparation of nickel(II) and cobalt(II) complexes containing alpha-diimine ligands using a mechanochemical approach are presented. The solvent-free reaction of [NiBr2(DME)] (DME 1,2-dimethoxyethane) with the appropriate alpha-diimine ligand led to the formation of the expected Ni(II) complexes in very short reaction times and with quantitative yields. The same compounds were also successfully synthesised when NiBr2 was employed. This methodology was extended to the preparation of [Co(alpha-diimine)Cl-2] complexes through the reaction of CoCl2 with different alpha-diimine ligands. These compounds were characterised by XRPD and SCXRD, when possible. The results obtained confirm that mechanochemistry has an enormous potential and that is an effective technique for the synthesis of coordination and organometallic compounds. (C) 2013 Elsevier B. V. All rights reserved.
α-Diimine nickel complexes of ethylene and related alkenes
作者:Yanxia Zhao、Zeyi Wang、Xiaojing Jing、Qingsong Dong、Shida Gong、Qian-Shu Li、Juan Zhang、Biao Wu、Xiao-Juan Yang
DOI:10.1039/c5dt02333e
日期:——
A series of α-diimine-supported nickel complexes with a coordinated alkene, [LNi(alkene)], were synthesized and their structure and bonding were studied.
A nickel‐catalyzedasymmetric reductive hydroarylation of vinyl amides to produce enantioenriched α‐arylbenzamides is reported. The use of a chiral bisimidazoline (BIm) ligand, in combination with diethoxymethylsilane and aryl halides, enables the regioselective introduction of aryl groups to the internal position of the olefin, forging a new stereogenic center α to the N atom. The use of neutral reagents
Noninnocent ligands: heteroleptic nickel complexes with α-diimine and 1,2-diketone derivatives
作者:Hong Yang、Yanxia Zhao、Bin Liu、Ji-Hu Su、Igor L. Fedushkin、Biao Wu、Xiao-Juan Yang
DOI:10.1039/c7dt00455a
日期:——
compound [(NiIL˙−)2] (1, L = [(2,6-iPr2C6H3)NC(Me)]2) with various 1,2-diketones afforded a series of heteroleptic complexes: [LNi(PhC(O)-C(O)Ph)] (2), [LNi(PhC(O)-C(O)Me)] (3), [LNi(3,5-tBu2C6H2O2)] (4), and [(LNi)μ–η2,η2-(MeC(O)-C(O)Me)}(NiL)] (5). Furthermore, the complex [Na(Et2O)][LNiPhC(O)-C(O)Ph}] (6) was obtained by the reduction of 2 with 1.0 equiv. of Na metal. These complexes, which contain
cyclization of 1,6-dienes affords 3,4-disubstituted cyclopentane and pyrrolidine derivatives with high trans diastereoselectivity. This cyclization reaction enables the efficient synthesis of trans-3,4-dimethyl gababutin, a pharmaceutical lead for treating neuropathic pain, and trans-3,4-dimethylpyrrolidine, a precursor to drug candidates and pesticides. The trans selectivity distinguishes this reaction
Cationic methallylnickel(II) complexes with α-diimine ligands: synthesis and X-ray structure
作者:Ali Mechria、Claude Bavoux、Faouzi Bouachir
DOI:10.1016/s0022-328x(03)00345-0
日期:2003.7
α-diimine ligands ArNC(R)C(R)NAr react with Ni(COD)2 (2) in the presence of methallyloxyphosphonium hexafluorophosphate [CH2C(Me)CH2OP(NMe2)3]+·PF6− (3) to give new cationic methallyl complexes of nickel(II) with α-diimine ligands 4a and 4b. The same complexes 4a–d can also be generated in high yields by reacting [α-diimine] NiBr2 with zinc and methallyloxyphosphonium salt 3. Molecular structure