Terminal acetylenes are amongst the most problematic substrates for alkynemetathesis because they tend to undergo rapid polymerization on contact with a metal alkylidyne. The molybdenum complex 3 endowed with triphenylsilanolate ligands, however, is capable of inducing surprisingly effective cross‐metathesis reactions of terminal alkyl acetylenes with propynyl(trimethyl)silane to give products of
Ruthenium-Catalyzed<i>trans</i>-Selective Hydrostannation of Alkynes
作者:Stephan M. Rummelt、Alois Fürstner
DOI:10.1002/anie.201311080
日期:2014.4.1
In contrast to all other transition‐metal‐catalyzed hydrostannation reactions documented in the literature, the addition of Bu3SnH across various types of alkynes proceeds with excellent trans selectivity, provided the reaction is catalyzed by [Cp*Ru]‐based complexes. This method is distinguished by a broad substrate scope and a remarkable compatibility with functional groups, including various substituents
Ruthenium-Catalyzed <i>trans</i>-Hydroalkynylation and <i>trans</i>-Chloroalkynylation of Internal Alkynes
作者:Nagaraju Barsu、Markus Leutzsch、Alois Fürstner
DOI:10.1021/jacs.0c08582
日期:2020.11.4
[Cp*RuCl]4 catalyzes the addition of iPr3SiC≡CX (X = H, Cl) across internal alkynes with formation of 1,3-enyne or 1-chloro-1,3-enyne derivatives, respectively; the reaction follows an unorthodox trans-addition mode. The well-balanced affinities of the different reaction partners to the ruthenium catalyst ensure that crossed addition prevails over homodimerization of the individual components, as can
A<i>trans</i>-Selective Hydroboration of Internal Alkynes
作者:Basker Sundararaju、Alois Fürstner
DOI:10.1002/anie.201307584
日期:2013.12.23
the rule: The reigning stereochemical principle of hydroboration is the suprafacial delivery of hydrogen and boron to the same π‐face of a given starting material. This fundamental rule of cis addition is now easily broken for internalalkynes with the help of [Cp*Ru(MeCN)3]PF6 (Cp*=η5‐C5Me5) as the catalyst. The resulting trans‐selective hydroboration opens a practical new entry into E‐configured alkenylboron
“Canopy Catalysts” for Alkyne Metathesis: Molybdenum Alkylidyne Complexes with a Tripodal Ligand Framework
作者:Julius Hillenbrand、Markus Leutzsch、Ektoras Yiannakas、Christopher P. Gordon、Christian Wille、Nils Nöthling、Christophe Copéret、Alois Fürstner
DOI:10.1021/jacs.0c04742
日期:2020.6.24
certain stability toward water, which marks a big leap forward in metal alkylidyne chemistry in general. At the same time, they tolerate many donor sites, including basic nitrogen and numerous heterocycles. This aspect is substantiated by applications to polyfunctional (natural) products. A combined spectroscopic, crystallographic, and computational study provides insights into structure and electronic