225916-39-2Relevant academic research and scientific papers
Nickel-Catalyzed Regioselective Alkenylarylation of γ,δ-Alkenyl Ketones via Carbonyl Coordination
Aryal, Vivek,Dhungana, Roshan K.,Giri, Ramesh,Lakomy, Margaret G.,Niroula, Doleshwar,Sapkota, Rishi R.
supporting information, p. 19092 - 19096 (2021/08/09)
We disclose a nickel-catalyzed reaction, which enabled us to difunctionalize unactivated γ,δ-alkenes in ketones with alkenyl triflates and arylboronic esters. The reaction was made feasible by the use of 5-chloro-8-hydroxyquinoline as a ligand along with
Ni-Catalyzed Borylation of Aryl Sulfoxides
Huang, Mingming,Wu, Zhu,Krebs, Johannes,Friedrich, Alexandra,Luo, Xiaoling,Westcott, Stephen A.,Radius, Udo,Marder, Todd B.
, p. 8149 - 8158 (2021/05/10)
A nickel/N-heterocyclic carbene (NHC) catalytic system has been developed for the borylation of aryl sulfoxides with B2(neop)2 (neop=neopentyl glycolato). A wide range of aryl sulfoxides with different electronic and steric properties were converted into the corresponding arylboronic esters in good yields. The regioselective borylation of unsymmetric diaryl sulfoxides was also feasible leading to borylation of the sterically less encumbered aryl substituent. Competition experiments demonstrated that an electron-deficient aryl moiety reacts preferentially. The origin of the selectivity in the Ni-catalyzed borylation of electronically biased unsymmetrical diaryl sulfoxide lies in the oxidative addition step of the catalytic cycle, as oxidative addition of methoxyphenyl 4-(trifluoromethyl)phenyl sulfoxide to the Ni(0) complex occurs selectively to give the structurally characterized complex trans-[Ni(ICy)2(4-CF3-C6H4){(SO)-4-MeO-C6H4}] 4. For complex 5, the isomer trans-[Ni(ICy)2(C6H5)(OSC6H5)] 5-I was structurally characterized in which the phenyl sulfinyl ligand is bound via the oxygen atom to nickel. In solution, the complex trans-[Ni(ICy)2(C6H5)(OSC6H5)] 5-I is in equilibrium with the S-bonded isomer trans-[Ni(ICy)2(C6H5)(SOC6H5)] 5, as shown by NMR spectroscopy. DFT calculations reveal that these isomers are separated by a mere 0.3 kJ/mol (M06/def2-TZVP-level of theory) and connected via a transition state trans-[Ni(ICy)2(C6H5)(η2-{SO}-C6H5)], which lies only 10.8 kcal/mol above 5.
Synthesis of arylboronates via the Pd-catalyzed desulfitative coupling reaction of sodium arylsulfinates with bis(pinacolato)diboron
Qiu, Di,Li, Songyi,Yue, Guanglu,Mao, Jinshan,Xu, Bei,Yuan, Xinyu,Ye, Fei
, (2021/11/04)
The desulfitative borylation reaction of sodium arylsulfinates with bis(pinacolato)diboron or bis(neopentylglycolato)diboron under palladium catalysis has been developed, allowing selective C-B bond formation to give arylboronates with a range of functional groups in moderate to good yields under mild reaction conditions. A gram-scale preparation as well as the cascade Suzuki-Miyaura cross-coupling of arylboronates demonstrated the potential practical utility in organic synthesis.
Ruthenium-Catalyzed Carbonylative Coupling of Anilines with Organoboranes by the Cleavage of Neutral Aryl C-N Bond
Xu, Jian-Xing,Zhao, Fengqian,Yuan, Yang,Wu, Xiao-Feng
supporting information, p. 2756 - 2760 (2020/03/30)
Herein, we report the first ruthenium-catalyzed Suzuki-type carbonylative reaction of electronically neutral anilines via C(aryl)-N bond cleavage. Without any ligand and base, diaryl ketones can be obtained in moderate to high yields by using Ru3/su
Ruthenium-Catalyzed Reductive Arylation of N-(2-Pyridinyl)amides with Isopropanol and Arylboronate Esters
Ronson, Thomas O.,Renders, Evelien,Van Steijvoort, Ben F.,Wang, Xubin,Wybon, Clarence C. D.,Prokopcová, Hana,Meerpoel, Lieven,Maes, Bert U. W.
supporting information, p. 482 - 487 (2019/01/04)
A new three-component reductive arylation of amides with stable reactants (iPrOH and arylboronate esters), making use of a 2-pyridinyl (Py) directing group, is described. The N-Py-amide substrates are readily prepared from carboxylic acids and PyNH2, and the resulting N-Py-1-arylalkanamine reaction products are easily transformed into the corresponding chlorides by substitution of the HN-Py group with HCl. The 1-aryl-1-chloroalkane products allow substitution and cross-coupling reactions. Therefore, a general protocol for the transformation of carboxylic acids into a variety of functionalities is obtained. The Py-NH2 by-product can be recycled.
Transition-Metal-Free ipso-Trifluoromethylthiolation of Lithium Aryl Boronates
Shen, Feng,Zheng, Hanliang,Xue, Xiao-Song,Lu, Long,Shen, Qilong
supporting information, p. 6347 - 6351 (2019/08/20)
A transition-metal-free direct trifluoromethylthiolation of the ipso-carbon of lithium aryl boronates with trifluoromethanesulfenate under mild conditions was described. In addition, late-stage site-selective C-H borylation/trifluoromethylation and C-Cl b
Ruthenium-Catalyzed C-H Arylation and Alkenylation of Furfural Imines with Boronates
Siopa, Filipa,Ramis Cladera, Valérie-Anne,Afonso, Carlos Alberto Mateus,Oble, Julie,Poli, Giovanni
supporting information, p. 6101 - 6106 (2018/09/18)
A Ru0-catalyzed direct C-H arylation and alkenylation of furfural imines with aryl- or alkenyl-boronates, in the presence of benzylideneacetone as a sacrificial hydride acceptor, is disclosed. This reaction provides access, after hydrolysis, to C3-arylated or vinylated furfural derivatives, and thus valorizes these relevant building-blocks obtained from lignocellulosic biomass. This approach, involving C-H activation by a Ru0/RuII, cycle offers several advantages, notably simple, mild and neutral reaction conditions.
Ruthenium-Catalyzed Ortho C-H Arylation of Aromatic Nitriles with Arylboronates and Observation of Partial Para Arylation
Koseki, Yuta,Kitazawa, Kentaroh,Miyake, Masashi,Kochi, Takuya,Kakiuchi, Fumitoshi
, p. 6503 - 6510 (2017/07/15)
Ruthenium-catalyzed C-H arylation of aromatic nitriles with arylboronates is described. The use of RuH2(CO){P(4-MeC6H4)3}3 as a catalyst provided higher yields of the ortho arylation products than the
Selective Monoarylation of Aromatic Ketones and Esters via Cleavage of Aromatic Carbon-Heteroatom Bonds by Trialkylphosphine Ruthenium Catalysts
Kondo, Hikaru,Kochi, Takuya,Kakiuchi, Fumitoshi
supporting information, p. 794 - 797 (2017/03/01)
We report here the ruthenium-catalyzed selective monoarylation of aromatic ketones bearing two ortho carbon-heteroatom (O or N) bonds. Under the newly developed catalyst system consisting of RuHCl(CO)(PiPr3)2, CsF, and sty
Syntheses of RuHCl(CO)(PAr3)3 and RuH2(CO)(PAr3)3 Containing various triarylphosphines and their use for arylation of sterically congested aromatic C-H bonds
Ogiwara, Yohei,Miyake, Masashi,Kochi, Takuya,Kakiuchi, Fumitoshi
supporting information, p. 159 - 164 (2017/11/27)
A series of ruthenium complexes, RuHCl(CO)(PAr3)3 and RuH2(CO)(PAr3)3, containing various triarylphosphines were synthesized. Screening of these complexes as catalysts for direct arylation of sterically congested ortho C-H bonds of aromatic ketones improved the yields of the arylation products.
