Stable, Yet Highly Reactive Nonclassical Iron(II) Polyhydride Pincer Complexes: <i>Z</i>-Selective Dimerization and Hydroboration of Terminal Alkynes
作者:Nikolaus Gorgas、Luis G. Alves、Berthold Stöger、Ana M. Martins、Luis F. Veiros、Karl Kirchner
DOI:10.1021/jacs.7b05051
日期:2017.6.21
polyhydride complexes containing tridentate PNP pincer-type ligands is described. These compounds of the general formula [Fe(PNP)(H)2(η2-H2)] exhibit remarkable reactivity toward terminalalkynes. They efficiently promote the catalytic dimerization of aryl acetylenes giving the corresponding conjugated 1,3-enynes in excellent yields with low catalyst loadings. When the reaction is carried out in the presence
描述了含有三齿 PNP 钳型配体的非经典铁 (II) 氢化物配合物的合成、表征和催化活性。这些通式[Fe(PNP)(H)2(η2-H2)]的化合物对末端炔表现出显着的反应性。它们有效地促进芳基乙炔的催化二聚化,以极低的催化剂负载量以优异的产率得到相应的共轭 1,3-烯炔。当反应在频哪醇硼烷存在下进行时,得到乙烯基硼酸酯。这两个反应都在温和的条件下进行,并且具有高度的化学选择性、区域选择性和立体选择性,Z 选择性高达 99%。
Cobalt Catalyzed <i>Z</i>-Selective Hydroboration of Terminal Alkynes and Elucidation of the Origin of Selectivity
作者:Jennifer V. Obligacion、Jamie M. Neely、Aliza N. Yazdani、Iraklis Pappas、Paul J. Chirik
DOI:10.1021/jacs.5b00936
日期:2015.5.13
A bis(imino)pyridine cotalt-catalyzed hydroboration of terminal,,alkynes with HBPin (Pin = pinacolate) with high yield and (Z)selectivity for synthetically valuable vinylboronate esters is described. Deuterium labeling studies Stoichiometric experiments, and isolation of catalytically relevant intermediats support a mechanism involving;selective insertion of,an alkynyl-boronate ester into a Co-H bond, a pathway distinct from known precious metal catalysts, where metal Vinylidene intermediates have been proposed to account for the observed (Z) selectivity. The identity Of the imine substituents dictates the relative rates of activation of the cobalt precatalyst with HBPin or the terminal alkyne and, as a consequence, is responsible for the stereochemical outcome of the catalytic reaction.
Ruthenium Catalyzed Hydroboration of Terminal Alkynes to <i>Z</i>-Vinylboronates
The nonclassical ruthenium hydride pincer complex [Ru(PNP)(H)(2)(H-2)] 1 (PNP = 1,3-bis(di-tert-butyl-phosphinomethyl)pyridine) catalyzes the anti-Markovnikov addition of pinacolborane to terminal alkynes yielding Z-vinylboronates at mild conditions. The complex [Ru(PNP)(H)(2)(HBpin)] 2 (HBpin = pinacolborane), which was identified at the end of the reaction and prepared independently, is proposed as the direct precursor to the catalytic cycle involving rearrangement of coordinated alkyne to Z-vinylidene as a key step for the apparent trans-hydroboration.
Dearomatization and Functionalization of Terpyridine Ligands Leading to Unprecedented Zwitterionic Meisenheimer Aluminum Complexes and Their Use in Catalytic Hydroboration
作者:Guoqi Zhang、Jing Wu、Haisu Zeng、Michelle C. Neary、Matthew Devany、Shengping Zheng、Pavel A. Dub
DOI:10.1021/acscatal.8b04096
日期:2019.2.1
terpyridine (tpy) ligands via 2′/6′-, 3′/5′-, or 4′-selective alkylation of the central pyridine ring. The reaction is mediated by the most abundant metal in the Earth’s crust, aluminum (Al), and depending on the conditions employed, exhibits ionic or radical character as suggested by experimental and computational analysis. In the latter case, intermediate formation of an AlIIIcomplex supported by π-radical