[Pd(IPr*<sup>OMe</sup>)(cin)Cl] (cin = Cinnamyl): A Versatile Catalyst for C–N and C–C Bond Formation
作者:Gulluzar Bastug、Steven P. Nolan
DOI:10.1021/om500026s
日期:2014.3.10
Buchwald–Hartwig cross-coupling reactions of stericallydemanding aryl chlorides with sterically hindered and deactivated aniline derivatives. This catalyst also proved efficient in Suzuki–Miyaura reactions, thus allowing the preparation of tetra-ortho-substitutedbiaryls. The Kumada–Corriu coupling has also been investigated using this palladium N-heterocyclic carbene (NHC) catalyst.
Highly Active Palladium Catalysts Supported by Bulky Proazaphosphatrane Ligands for Stille Cross-Coupling: Coupling of Aryl and Vinyl Chlorides, Room Temperature Coupling of Aryl Bromides, Coupling of Aryl Triflates, and Synthesis of Sterically Hindered Biaryls
作者:Weiping Su、Sameer Urgaonkar、Patrick A. McLaughlin、John G. Verkade
DOI:10.1021/ja0450096
日期:2004.12.1
R' = i-Bu, 1; R = Bz, R' = i-Bu, 3; R = R' = Bz, 4] for palladium-catalyzed Stille reactions of aryl chlorides is described. Catalysts derived from ligands 1 and 4 efficiently catalyze the coupling of electronically diverse aryl chlorides with an array of organotin reagents. The catalyst system based on the ligand 3 is active for the synthesis of sterically hindered biaryls (di-, tri-, and tetra-ortho
Hindered Aryllithium Reagents as Partners in Palladium-Catalyzed Cross-Coupling: Synthesis of Tri- and Tetra-<i>ortho</i>-Substituted Biaryls under Ambient Conditions
作者:Massimo Giannerini、Valentín Hornillos、Carlos Vila、Martín Fañanás-Mastral、Ben L. Feringa
DOI:10.1002/anie.201306427
日期:2013.12.9
lithium reagent: Mono‐ and di‐ortho‐substituted aryllithiumreagents were coupled through palladium catalysis with hindered aryl bromides to form highly congested tri‐ and tetra‐ortho‐substituted biaryls. The reaction allows the use of easily accessible ortho‐functionalized aryllithium compounds. The high reactivity of organolithium reagents facilitates a fast process underambientconditions.
Pd-PEPPSI-IPent: Low-Temperature Negishi Cross-Coupling for the Preparation of Highly Functionalized, Tetra-ortho-Substituted Biaryls
作者:Selçuk Çalimsiz、Mahmoud Sayah、Debasis Mallik、Michael G. Organ
DOI:10.1002/anie.200906811
日期:2010.3.8
Cool couplings: Complex, hindered biaryls have been prepared at temperatures ranging from 0°C to room temperature, or with gentle heating. The Pd‐PEPPSI‐IPent catalyst (see scheme) nicely couples starting materials containing acidic moieties and routinely prepares biaryl derivatives where one or both rings comprising the biaryl are heterocyclic. Ar1=hindered aryl or heteroaryl, Ar2=unactivated aryl
[Pd(μ-Cl)Cl(IPr*)]<sub>2</sub>: a highly hindered pre-catalyst for the synthesis of tetra-ortho-substituted biaryls via Grignard reagent cross-coupling
作者:Mathieu Lesieur、Alexandra M. Z. Slawin、Catherine S. J. Cazin
DOI:10.1039/c4ob01269k
日期:——
The new well-defined catalyst [Pd(μ-Cl)Cl(IPr*)]2 enables the efficient Grignard reagent cross-coupling for the synthesis of tetra-ortho-substituted biaryls.