60536-98-3Relevant academic research and scientific papers
Application of a Ferrocene-Based Palladacycle Precatalyst to Enantioselective Aryl-Aryl Kumada Coupling
Arthurs, Ross A.,Hughes, David L.,Richards, Christopher J.
, (2022/02/21)
The palladium catalysed reaction of 1-iodo-2-methylnaphthalene and 2-methyl-1-naphthylmagnesium bromide gave quantitatively an (Sa)-configured cross-coupled product in 80 % e.e. using (R,Sp)-PPFA as a ligand. N,N-Dimethylaminomethylferrocene was cyclopalladated (Na2PdCl4, (S)?Ac?Phe?OH, 93 % e.e., as determined by 1H NMR as a result of self-induced non-equivalence), and the resulting (Sp)-configured dimeric palladacycle was employed as a precatalyst for this cross-coupling reaction (5 mol%). Addition to the palladacycle of diphenylphosphine and subsequent base-promoted bidentate ligand synthesis and palladium capture gave an in situ generated catalyst resulting in an (Sp)-configured product in up to 71 % e.e.
Supramolecular Polymerization of [5]Helicenes. Consequences of Self-Assembly on Configurational Stability
Valera, Jorge S.,Gómez, Rafael,Sánchez, Luis
, p. 2020 - 2023 (2018/04/16)
The supramolecular polymerization of [5]helicenes 1 and 2 is investigated. The self-assembly of these helicenes proceeds by the operation of H-bonding interactions with a negligible participation of π-stacking. The enantiopurity of the sample has a dramatic effect on the supramolecular polymerization mechanism since it reverts the isodesmic mechanism for the racemic mixture to a cooperative one for the enantioenriched sample. Noticeably, the formation of supramolecular polymers efficiently increases the configurational stability of 1,14-unsubstituted [5]helicenes.
Computationally Assisted Mechanistic Investigation and Development of Pd-Catalyzed Asymmetric Suzuki-Miyaura and Negishi Cross-Coupling Reactions for Tetra- ortho-Substituted Biaryl Synthesis
Patel, Nitinchandra D.,Sieber, Joshua D.,Tcyrulnikov, Sergei,Simmons, Bryan J.,Rivalti, Daniel,Duvvuri, Krishnaja,Zhang, Yongda,Gao, Donghong A.,Fandrick, Keith R.,Haddad, Nizar,Lao, Kendricks So,Mangunuru, Hari P. R.,Biswas, Soumik,Qu, Bo,Grinberg, Nelu,Pennino, Scott,Lee, Heewon,Song, Jinhua J.,Gupton, B. Frank,Garg, Neil K.,Kozlowski, Marisa C.,Senanayake, Chris H.
, p. 10190 - 10209 (2018/10/20)
Metal-catalyzed cross-coupling reactions are extensively employed in both academia and industry for the synthesis of biaryl derivatives for applications to both medicine and material science. Application of these methods to prepare tetra-ortho-substituted
NOVEL CHIRAL DIHYDROBENZOAZAPHOSPHOLE LIGANDS AND SYNTHESIS THEREOF
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Paragraph 0145; 0146, (2018/06/15)
This invention relates to novel phosphorous ligands useful for organic transformations. Methods of making and using the ligands in organic synthesis are described. The invention also relates to processes for preparing the novel ligands.
A Binaphthyl-Based Scaffold for a Chiral Dirhodium(II) Biscarboxylate Ligand with α-Quaternary Carbon Centers
Chen, Po-An,Setthakarn, Krit,May, Jeremy A.
, p. 6155 - 6161 (2017/09/15)
A chiral dirhodium(II) paddlewheel complex has been synthesized from biscarboxylate ligands derived from BINOL, and the resulting complex has been used in enantioselective carbene/alkyne cascade reactions. The ligand design was guided by requirements of α
Readily available catalysts for demanding Suzuki–Miyaura couplings under mild conditions
Demchuk, Oleg M.,Kap?on, Katarzyna,Mazur, Liliana,Strzelecka, Dorota,Pietrusiewicz, K. Micha?
supporting information, p. 6668 - 6677 (2016/09/28)
A straightforward synthesis of a sterically hindered and electron rich bidentate monophosphine biaryl ligand Sym-Phos of C,P-type of complexation was realised in a high yield starting from simple substrates in easily affordable conditions. In combination with a palladium source, the obtained ligand formed a highly active catalyst mediating sterically demanding Suzuki–Miyaura coupling reactions in aqueous media even at 60 °C and with no need to protect the reaction mixture by an inert gas.
Dimerization of Aryl Sulfonates by in situ Generated Nickel(0)
Maddaluno, Jacques,Durandetti, Muriel
supporting information, p. 2385 - 2388 (2015/10/19)
A mild and user-friendly nickel-catalyzed method for the reductive homocoupling of aromatic tosylates is presented. The reaction proceeds between room temperature and 60 °C, with stable substrates (ArOTs) easily prepared from inexpensive and commercially available phenols or naphthols. It relies on a catalytic amount (10 mol%) of a robust catalyst (NiBr2bipy) that does not require the preparation of sensitive organometallic intermediates. Yields are good to excellent.
2: A highly hindered pre-catalyst for the synthesis of tetra-ortho-substituted biaryls via Grignard reagent cross-coupling
Lesieur, Mathieu,Slawin, Alexandra M. Z.,Cazin, Catherine S.J.
supporting information, p. 5586 - 5589 (2014/07/22)
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. The high reactivity of the complex is associated with the important bulkiness of the I
Large yet flexible N-heterocyclic carbene ligands for palladium catalysis
Meiries, Sebastien,Le Duc, Gaetan,Chartoire, Anthony,Collado, Alba,Speck, Klaus,Arachchige, Kasun S. Athukorala,Slawin, Alexandra M. Z.,Nolan, Steven P.
supporting information, p. 17358 - 17368 (2014/01/06)
A straightforward and scalable eight-step synthesis of new N-heterocyclic carbenes (NHCs) has been developed from inexpensive and readily available 2-nitro-m-xylene. This process allows for the preparation of a novel class of NHCs coined ITent ("Tent" for "tentacular") of which the well-known IMes (N,N′-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene), IPr (N,N′-bis(2,6-di(2-propyl)phenyl)imidazol-2-ylidene) and IPent (N,N′-bis(2,6-di(3-pentyl)phenyl)imidazol-2-ylidene) NHCs are the simplest and already known congeners. The synthetic route was successfully used for the preparation of three members of the ITent family: IPent (N,N′-bis(2,6- di(3-pentyl)phenyl)imidazol-2-ylidene), IHept (N,N′-bis(2,6-di(4-heptyl) phenyl)imidazol-2-ylidene) and INon (N,N′-bis(2,6-di(5-nonyl)phenyl) imidazol-2-ylidene). The electronic and steric properties of each NHC were studied through the preparation of both nickel and palladium complexes. Finally the effect of these new ITent ligands in Pd-catalyzed Suzuki-Miyaura and Buchwald-Hartwig cross-couplings was investigated. Tentacular NHCs: A straightforward, scalable eight-step synthesis of N-heterocyclic carbenes (NHCs) has been developed using inexpensive and readily available 2-nitro-m-xylene, allowing the preparation of a class of NHCs designated ITent ("Tent" for "tentacular"). The electronic and steric properties of each NHC were studied through the preparation of both nickel and palladium complexes, and the effect of these new ITent ligands in Pd-catalyzed Suzuki-Miyaura and Buchwald-Hartwig cross-couplings was investigated.
Planar chiral triazole-based phosphanes derived from [2.2]paracyclophane and their activity in suzuki coupling reactions
Glover, Jean E.,Martin, David J.,Plieger, Paul G.,Rowlands, Gareth J.
, p. 1671 - 1675 (2013/04/10)
In this communication we report the short synthesis of a variety of planar chiral triazole-based phosphanes. These molecules have been readily prepared from 4-azido[2.2]paracyclophane in two steps. It was observed that the stability of the resulting phosphanes was dependent on the C-4 substituent. The efficacy of the new phosphanes in the palladium-mediated Suzuki-Miyaura coupling reaction was evaluated. The phosphanes proved to be more effective than previously prepared planar chiral [2.2]paracyclophane-based phosphanes. Planar chiral phosphanes have been prepared from the first example of a [2.2]paracyclophane- derived 1,2,3-triazole with a carbon substituent at the 4-position. The nature of the 4-substituent appears to control the stability of the resulting 1,4,5-trisubstituted triazoles. The activities of the phosphanes as ligands in Suzuki coupling reactions has also been assessed. Copyright
