[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.
[EN] NOVEL PRECATALYST SCAFFOLDS FOR CROSS-COUPLING REACTIONS, AND METHODS OF MAKING AND USING SAME<br/>[FR] NOUVEAUX SUPPORTS DE PRÉ-CATALYSEURS POUR RÉACTIONS À COUPLAGE MUTUEL, ET LEURS PROCÉDÉS DE FABRICATION ET D'UTILISATION
申请人:UNIV YALE
公开号:WO2016057600A1
公开(公告)日:2016-04-14
The present invention provides novel transition-metal precatalysts that are useful in preparing active coupling catalysts. In certain embodiments, the precatalysts of the invention are air-stable and moisture-stable. The present invention further provides methods of making and using the precatalysts of the invention.
Into the groove: The introduction of a C2‐symmetric N‐heterocyclic carbene ligand with appropriately substituted naphthyl side chains enables the efficient Suzuki–Miyauracoupling to form bulky tetra‐ortho‐substituted biaryls from aryl bromides and chlorides at room temperature. DFT calculations uncover the subtle steric phenomena at play that lead to the superior catalytic performance. Cyoct=cyclooctyl
Precatalyst scaffolds for cross-coupling reactions, and methods of making and using same
申请人:YALE UNIVERSITY
公开号:US10894802B2
公开(公告)日:2021-01-19
The present invention provides novel transition-metal precatalysts that are useful in preparing active coupling catalysts. In certain embodiments, the precatalysts of the invention are air-stable and moisture-stable. The present invention further provides methods of making and using the precatalysts of the invention.
Design of a Versatile and Improved Precatalyst Scaffold for Palladium-Catalyzed Cross-Coupling: (η<sup>3</sup>-1-<sup>t</sup>Bu-indenyl)<sub>2</sub>(μ-Cl)<sub>2</sub>Pd<sub>2</sub>
作者:Patrick R. Melvin、Ainara Nova、David Balcells、Wei Dai、Nilay Hazari、Damian P. Hruszkewycz、Hemali P. Shah、Matthew T. Tudge
DOI:10.1021/acscatal.5b00878
日期:2015.6.5
We describe the development of (eta(3)-1-Bu-t-indenyl)(2)(mu-Cl)(2)Pd-2, a versatile precatalyst scaffold for Pd-catalyzed cross-coupling. Our new system is more active than commercially available (eta(3)-cinnamyl)(2)(mu-Cl)(2)Pd-2 and is compatible with a range of NHC and phosphine ligands. Precatalysts of the type (eta(3)-1-Bu-t-indenyl)Pd(Cl)(L) can either be isolated through the reaction of (eta(3)-1-Bu-t-indenyl)(2)(mu-Cl)(2)Pd-2 with the appropriate ligand or generated in situ, which offers advantages for ligand screening. We show that the (eta(3)-1-Bu-t-indenyl)(2)(mu-Cl)(2)Pd-2 scaffold generates highly active systems for a number of challenging cross-coupling reactions. The reason for the improved catalytic activity of systems generated from the (eta(3)-1-Bu-t-indenyl)(2)(mu-Cl)(2)Pd-2 scaffold compared to (eta(3)-cinnamyl)(2)(mu-Cl)(2)Pd-2 is that inactive Pd-I dimers are not formed during catalysis.