A copper-catalyzedasymmetricallylicsubstitution of γ,γ-disubstituted allylphosphates with arylboronates has been developed for the construction of quaternary stereocenters. High regio- and enantioselectivities have been achieved by employing a hydroxy-bearing chiral N-heterocyclic carbene ligand, and both E and Z substrates provide the same enantiomer as the major product. The mechanistic aspect
Bis(oxamato)palladate(II) complexes: synthesis, crystal structure and application to catalytic Suzuki reaction
作者:Francisco Ramón Fortea-Pérez、Donatella Armentano、Miguel Julve、Giovanni De Munno、Salah-Eddine Stiriba
DOI:10.1080/00958972.2014.975697
日期:2014.12.17
New bis(oxamato)palladate(II) complexes, [Pd(H2O)4][Pd(2,6-Me2pma)2]·2H2O (1), (n-Bu4N)2[Pd(2,6-Me2pma)2]·2H2O (2a), and (n-Bu4N)2[Pd(2,6-Me2pma)2]·2CHCl3 (2b) (2,6-Me2pma = N-2,6-dimethylphenyoxamate and n-Bu4N+ = tetra-n-butylammonium), have been synthesized and the structures of 1 and 2b characterized by single-crystal X-ray diffraction. Complex 1 is a double salt constituted by tetraaquapalladium(II)
新的双(oxamato)钯(II)配合物,[Pd(H2O)4][Pd(2,6-Me2pma)2]·2 (1),(n-Bu4N)2[Pd(2,6-Me2pma) 2]·2 (2a) 和 (n-Bu4N)2[Pd(2,6-Me2pma)2]·2CHCl3 (2b) (2,6-Me2pma = N-2,6-二甲基苯草酸酯和 n-Bu4N+ =四正丁基铵),已经合成,1 和 2b 的结构通过单晶 X 射线衍射表征。配合物 1 是由四水合钯 (II) 阳离子和双 (草酸) 钯 (II) 阴离子通过氢键连接而成的复盐。1 中的钯 (II) 离子与来自两个完全去质子化的草酸酯配体(阴离子)的两个氧和两个氮和四个水分子(阳离子)四配位,形成中心对称的方形平面环境。中心对称的双(oxamato)钯(II)阴离子与 1 一样出现在 2b 中,该化合物中的电荷平衡由庞大的 n-Bu4N+ 确保。通过
Copper-Catalyzed S<sub>N</sub>2′-Selective Allylic Substitution Reaction of <i>gem</i>-Diborylalkanes
作者:Zhen-Qi Zhang、Ben Zhang、Xi Lu、Jing-Hui Liu、Xiao-Yu Lu、Bin Xiao、Yao Fu
DOI:10.1021/acs.orglett.5b03692
日期:2016.3.4
A Cu/(NHC)-catalyzed SN2′-selective substitution reaction of allylic electrophiles with gem-diborylalkanes is reported. Different substituted gem-diborylalkanes and allylic electrophiles can be employed in this reaction, and various synthetic valuable functional groups can be tolerated. The asymmetric version of this reaction was initially researched with chiral N-heterocyclic carbene (NHC) ligands
报道了Cu /(NHC)催化的烯丙基亲电试剂与宝石-二硼烷基烷烃的S N 2'-选择性取代反应。在该反应中可以使用不同的取代的宝石-二硼烷基烷烃和烯丙基亲电子试剂,并且可以容许各种合成的有价值的官能团。最初使用手性N-杂环卡宾(NHC)配体研究了该反应的不对称形式。
Copper-catalyzed asymmetric addition of arylboronates to isatins: a catalytic cycle involving alkoxocopper intermediates
作者:Ryo Shintani、Keishi Takatsu、Tamio Hayashi
DOI:10.1039/c0cc01635g
日期:——
A copper-catalyzedaddition of arylboronates to isatins has been developed to give 3-aryl-3-hydroxy-2-oxindoles under mild conditions. The catalytic cycle of this process has been examined through a series of stoichiometric reactions and an effective asymmetric variant has also been described by the use of a chiral N-heterocyclic carbene ligand.
Ligand Design for Heterobimetallic Single-Chain Magnets: Synthesis, Crystal Structures, and Magnetic Properties of MIICuII (M=Mn, Co) Chains with Sterically Hindered Methyl-Substituted Phenyloxamate Bridging Ligands
作者:Emilio Pardo、Rafael Ruiz-García、Francesc Lloret、Juan Faus、Miguel Julve、Yves Journaux、Miguel A. Novak、Fernando S. Delgado、Catalina Ruiz-Pérez
DOI:10.1002/chem.200600992
日期:2007.2.23
oxamato-bridged heterobimetallicchains of general formula [MCu(L(x))(2)] m DMSO (m=0-4) (L(1)=N-2-methylphenyloxamate, M=Mn (1 a) and Co (1 b); L(2)=N-2,6-dimethylphenyloxamate, M=Mn (2 a) and Co (2 b); L(3)=N-2,4,6-trimethylphenyloxamate, M=Mn (3 a) and Co (3 b)) have been prepared by reaction between the corresponding anionic oxamatocopper(II) complexes [Cu(Lx)2](2-) with Mn(2+) or Co(2+) cations in