Cyclotrimerization of terminal alkynes catalyzed by the system of NiCl2/Zn and (benzimidazolyl)-6-(1-(arylimino)ethyl)pyridines
作者:Chanjuan Xi、Zelin Sun、Yongbing Liu
DOI:10.1039/c3dt51674a
日期:——
An effective regioselective cyclotrimerization of terminal alkynes is achieved by the direct utilization of NiCl2·6H2O, Zn, and 2-(benzimidazolyl)-6-(1-(arylimino)ethyl)pyridine in one step under ambient temperature.
The first cobalt catalyzed [2 + 2 + 2] alkyne cyclotrimerization in aqueous medium at room temperature
作者:Li Yong、Holger Butenschön
DOI:10.1039/b207978j
日期:——
Chelate complex 1 (5 mol%) was found to catalyze the [2 + 2 + 2] cyclization of terminal alkynes in good yields in a 80/20 mixture of water and ethanol at room temperature without further activation.
Chemo- and Regioselective Intermolecular Cyclotrimerization of Terminal Alkynes Catalyzed by Cationic Rhodium(I)/Modified BINAP Complexes: Application to One-Step Synthesis of Paracyclophanes
the cationicrhodium(I)/DTBM-Segphos complex. This method can be applied to a variety of terminal alkynes to provide 1,2,4-trisubstituted benzenes in high yield and with high regioselectivity. A chemo- and regioselective intermolecular crossed-cyclotrimerization of dialkyl acetylenedicarboxylates with a variety of terminal alkynes has also been developed based on the use of the cationicrhodium(I)/H8-BINAP
Highly regioselective cyclotrimerization of terminal alkynes catalyzed by Fe(II) complexes bearing 2-(benzimidazolyl)-6-(1-(arylimino)ethyl)pyridines
作者:Yongbing Liu、Xiaoyu Yan、Nianfa Yang、Chanjuan Xi
DOI:10.1016/j.catcom.2010.11.013
日期:2011.2
FeCl2 ligated with 2-(benzimidazolyl)-6-(1-(arylimino)ethyl)pyridine in the presence of zinc powder and zinc iodide could effectively catalyze cyclotrimerization of intermolecular alkynes to afford benzene derivatives in high regioselectivity. The synthetic usefulness of this catalytic system consisting of Fe(II) complex C1, Zn and Znl(2) in acetonitrile was tested with various terminal alkynes. In the cases of using aryl substituted alkynes, the 1,2,4-trisubstituted benzenes 2 were found to be the major products. (C) 2010 Elsevier B.V. All rights reserved.
Thermally Stable Redox Noninnocent Bathocuproine-Iron Complex for Cycloaddition Reactions
作者:Mae Féo、Nikki J. Bakas、Aleksa Radović、William Parisot、Anne Clisson、Lise-Marie Chamoreau、Mansour Haddad、Virginie Ratovelomanana-Vidal、Michael L. Neidig、Guillaume Lefèvre
DOI:10.1021/acscatal.3c00353
日期:——
N)2Fe species, which exhibits an unprecedented thermal and kinetic stability, amenable to its easy use as an in situ generated precursor in catalytic processes. The electronic structure of this noninnocent complex has been fully rationalized, and its promising catalytic activity in alkyne [2 + 2 + 2] cyclizations is discussed. Given its intrinsic thermal stability due to the noninnocent behavior of the