Pushing the limits of steric demand around a biaryl axis: synthesis of tetra-ortho-substituted biaryl naphthalenes
作者:Adam C. Glass、Sam Klonoski、Lev N. Zakharov、Shih-Yuan Liu
DOI:10.1039/c0cc02170a
日期:——
The synthesis of tetra-ortho-substituted biaryl naphthalenes, including examples bearing multiple ortho-isopropyl groups, has been developed via a catalytic rearrangement process.
An Extremely Active and General Catalyst for Suzuki Coupling Reaction of Unreactive Aryl Chlorides
作者:Dong-Hwan Lee、Myung-Jong Jin
DOI:10.1021/ol102677r
日期:2011.1.21
2a acted as a powerful catalyst which allows easy access to the Suzukicouplingreaction of less reactive arylchlorides under mild conditions. A wide range of sterically hindered and deactivated arylchlorides could be efficiently coupled at a low catalyst loading of 0.1 mol %. Furthermore, this catalytic system also proved to be highly effective in one-pot multiple couplings.
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
[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.
A versatile catalyst system for Suzuki–Miyaura syntheses of sterically hindered biaryls employing a cyclobutene-1,2-bis(imidazolium) salt
作者:Andreas Schmidt、Alireza Rahimi
DOI:10.1039/c001362e
日期:——
The catalyst system consisting of 3,3â²-(3,4-bis(dichloro-methylene)cyclobut-1-ene-1,2-diyl)bis(1-methyl-1H-imidazolium) bis(tetrafluoroborate), Pd(OAc)2 and NaOtBu in toluene proved to be very effective for a broad variety of SuzukiâMiyaura reactions at room temperature. It is also suited for the synthesis of sterically hindered compounds including 2,6-di-tert-butyl-2â²-substituted biaryls at elevated temperatures.