Title: Highly convenient, clean, fast, and reliable Sonogashira coupling reactions promoted by aminophosphine-based pincer complexes of palladium performed under additive- and amine-free reaction conditions
Authors : Bolliger, Jeanne L.
Frech, Christian M.
Published in : Advanced synthesis & catalysis
Volume(Issue) : 351
Issue : 6
Pages : 891
Pages to: 902
Publisher / Ed. Institution : Wiley
Issue Date: 2009
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subject (DDC) : 540: Chemistry
Abstract: Sequential addition of 1,1′,1′′‐phosphinetriyltripiperidine and 1,3‐diaminobenzene or resorcinol to toluene solutions of (cyclooctadiene)palladium dichloride [Pd(cod)(Cl)2] under nitrogen in “one pot” almost quantitatively yielded the aminophosphine‐based pincer complexes {[C6H3‐2,6‐(XP{piperidinyl}2)2]Pd(Cl)} (X=NH 1; X=O 2). Complex 1 (and to a minor extent 2) proved to be efficient Sonogashira catalysts, which allow the quantitative coupling of various electronically deactivated and/or sterically hindered and functionalized aryl iodides and aryl bromides with several alkynes as coupling partners within very short reaction times and low catalyst loadings. Importantly, in contrast to most of the Sonogashira catalysts, which either are both air‐ and moisture‐sensitive and/or require the addition of co‐catalysts, such as copper(I) iodide [CuI], for example, or a large excess of an amine, the coupling reactions were carried out without the use of amines, co‐catalysts or other aditives and without exclusion of air and moisture. Moreover, the desired products were exclusively formed (no side‐products were detected) without employing an excess of one of the substrates. Ethylene glycol and potassium phosphate (K3PO4) were found to be the ideal solvent and base for this transformation. Experimental observations strongly indicate that palladium nanoparticles are not the catalytically active form of 1 and 2. On the other hand, their transformation into another homogeneous catalytically active species cannot be excluded.
Departement: Life Sciences and Facility Management
Publication type: Article in scientific Journal
DOI : 10.1002/adsc.200900112
ISSN: 1615-4150
1615-4169
URI: https://digitalcollection.zhaw.ch/handle/11475/10479
Appears in Collections:Publikationen Life Sciences und Facility Management

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