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.
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.
Highly Regioselective Syntheses of Substituted Triphenylenes from 1,2,4-Trisubstituted Arenes via a Co-Catalyzed Intermolecular Alkyne Cyclotrimerization
作者:Lingmin Xu、Ruocheng Yu、Yuefan Wang、Jiahua Chen、Zhen Yang
DOI:10.1021/jo400570b
日期:2013.6.7
report the development of a new method for the syntheses of substituted triphenylenes from the corresponding 1,2,4-trisubstituted arenes, which were themselves generated in a highlyregioselective manner according to an intermolecular alkynecyclotrimerization reaction that was catalyzed by a novel Co–TMTU complex. This highlyregioselective reaction for the formation of 1,2,4-trisubstituted arenes will