1592-11-6Relevant articles and documents
Absolute rate constants of alkene addition reactions of a fluorinated radical in water
Zhang,Dolbier Jr.,Sheeller,Ingold
, p. 6362 - 6366 (2002)
Absolute rate constants of ·RfSO3-radical addition to a series of water-soluble alkenes containing ionic, carboxylate substituents were measured by laser flash photolysis experiments in water. The observed rate constants w
Heteroatom Donor-Decorated Polymer-Immobilized Ionic Liquid Stabilized Palladium Nanoparticles: Efficient Catalysts for Room-Temperature Suzuki-Miyaura Cross-Coupling in Aqueous Media
Doherty, Simon,Knight, Julian G.,Backhouse, Tom,Abood, Einas,Al-shaikh, Hind,Clemmet, Ashley R.,Ellison, Jack R.,Bourne, Richard A.,Chamberlain, Thomas W.,Stones, Rebecca,Warren, Nicholas J.,Fairlamb, Ian J. S.,Lovelock, Kevin R. J.
, p. 3716 - 3731 (2018)
Palladium nanoparticles stabilized by heteroatom donor-modified polystyrene-based polymer immobilized ionic liquids (PdNP@HAD-PIILP; HAD-PPh2, OMe, NH2, CN, pyrrolidone) are highly efficient catalysts for the Suzuki-Miyaura cross-cou
Pd-Catalyzed Synthesis of Vinyl Arenes from Aryl Halides and Acrylic Acid
Gao, Yang,Ou, Yang,Goo?en, Lukas J.
supporting information, p. 8709 - 8712 (2019/06/17)
Acrylic acid is presented as an inexpensive, non-volatile vinylating agent in a palladium-catalyzed decarboxylative vinylation of aryl halides. The reaction proceeds through a Heck reaction of acrylic acid, immediately followed by protodecarboxylation of the cinnamic acid intermediate. The use of the carboxylate group as a deciduous directing group ensures high selectivity for monoarylated products. The vinylation process is generally applicable to diversely substituted substrates. Its utility is shown by the synthesis of drug-like molecules and the gram-scale preparation of key intermediates in drug synthesis.
D-A-D type dinitriles with vapor-dependent luminescence in the solid state
Furuyama, Taniyuki,Shinozaki, Junichi,Tasso, Thiago Teixeira,Maeda, Hajime,Segi, Masahito,Kobayashi, Nagao
supporting information, p. 4243 - 4247 (2017/10/12)
D-A-D (Donor-Acceptor-Donor) type dinitriles linked by a styryl or phenylethynyl group have been prepared. These groups were introduced to increase the flexibility and the size of the π-conjugation in the chromophores. Both compounds showed strong emission in the solid state, AIE (aggregation-induced emission) behavior, and mechanochromism. The fluorescence color of ground powder changed by organic solvent vapor (vapochromism). Especially, the emission color of the styryl dinitrile after exposures depends on the solvent, while that of the phenylethynyl dinitrile is the same after exposure to different solvents. These results were explained by single crystal and powder XRD measurements, which revealed that the flexible styryl linker leads to a loose crystal packing, resulting in a dinitrile with multi-state microcrystalline structures. This methodology based on the flexible linker allows for the detection of small organic molecules without transition metals.
Synthesis of α-aryl esters and nitriles: Deaminative coupling of α-aminoesters and α-aminoacetonitriles with arylboronic acids
Wu, Guojiao,Deng, Yifan,Wu, Chaoqiang,Zhang, Yan,Wang, Jianbo
supporting information, p. 10510 - 10514 (2016/02/18)
Transition-metal-free synthesis of α-aryl esters and nitriles using arylboronic acids with α-aminoesters and α-aminoacetonitriles, respectively, as the starting materials has been developed. The reaction represents a rare case of converting C(sp3)-N bonds into C(sp3)-C(sp2) bonds. The reaction conditions are mild, demonstrate good functional-group tolerance, and can be scaled up. Touch base: A transition-metal-free protocol for the synthesis of α-aryl esters and nitriles by deaminative coupling is presented. Strong bases and transition-metal catalysts are not needed. The new synthetic method uses readily available starting materials and demonstrates wide substrate scope.
Intermolecular aminotrifluoromethylation of alkenes by visible-light-driven photoredox catalysis
Yasu, Yusuke,Koike, Takashi,Akita, Munetaka
supporting information, p. 2136 - 2139 (2013/06/05)
Intermolecular aminotrifluoromethylation of alkenes catalyzed by [Ru(bpy)3]2+ under visible light irradiation has been explored. The present photocatalytic protocol achieves highly efficient and regioselective difunctionalization of C=C bonds, leading to a variety of β-trifluoromethylamines. The reaction is applied to late-stage aminotrifluoromethylation of steroid and amino acid scaffolds.
Synthesis of α-Aryl nitriles through palladium-catalyzed decarboxylative coupling of cyanoacetate salts with aryl halides and triflates
Shang, Rui,Ji, Dong-Sheng,Chu, Ling,Fu, Yao,Liu, Lei
supporting information; experimental part, p. 4470 - 4474 (2011/06/24)
Worth its salt: The palladium-catalyzed decarboxylative coupling of the cyanoacetate salt as well as its mono- and disubstituted derivatives with aryl chlorides, bromides, and triflates is described (see scheme). This reaction is potentially useful for the preparation of a diverse array of α-aryl nitriles and has good functional group tolerance. S-Phos=2-(2,6- dimethoxybiphenyl)dicyclohexylphosphine), Xant-Phos=4,5-bis(diphenylphosphino)- 9,9-dimethylxanthene. Copyright
Optimization of polystyrene-supported triphenylphosphine catalysts for aza-Morita-Baylis-Hillman reactions
Zhao, Lin-Jing,Kwong, Cathy Kar-Wing,Shi, Min,Toy, Patrick H.
, p. 12026 - 12032 (2007/10/03)
A series of polar group functionalized polystyrene-supported phosphine reagents were examined as catalysts in the aza-Morita-Baylis-Hillman reactions of N-tosyl arylimines and a variety of Michael acceptors with the aim of identifying the optimal polymer/solvent combination. For these reactions JandaJel-PPh3 (1 mmol PPh3/g loading) resin containing methoxy groups (JJ-OMe-PPh3) on the polystyrene backbone in THF solvent provided the highest yield of all the catalyst/solvent combinations examined. The methyl ether groups were incorporated into JJ-OMe-PPh3 using commercially available 4-methoxystyrene, and thus such polar polystyrene resins are easily accessible and should find utility as nucleophilic catalyst supports.