1826-13-7Relevant academic research and scientific papers
Dehydration Polymerization for Poly(hetero)arene Conjugated Polymers
Mirabal, Rafael A.,Vanderzwet, Luke,Abuadas, Sara,Emmett, Michael R.,Schipper, Derek
supporting information, p. 12231 - 12235 (2018/04/19)
The lack of scalable and sustainable methods to prepare conjugated polymers belies their importance in many enabling technologies. Accessing high-performance poly(hetero)arene conjugated polymers by dehydration has remained an unsolved problem in syntheti
Photo-oxidative Cross-Dehydrogenative Coupling-Type Reaction of Thiophenes with α-Position of Carbonyls Using a Catalytic Amount of Molecular Iodine
Sudo, Yusuke,Yamaguchi, Eiji,Itoh, Akichika
supporting information, p. 1610 - 1613 (2017/04/13)
A metal-free photo-oxidative intermolecular C-H/C-H coupling reaction of thiophenes is demonstrated with carbonyls using a catalytic amount of molecular iodine. In this system, molecular oxygen in the air acted as a terminal oxidant to regenerate molecular iodine. A mechanistic study was also performed.
Visible-light-induced regioselective synthesis of polyheteroaromatic compounds
Chatterjee, Tanmay,Choi, Myung Gil,Kim, Jun,Chang, Suk-Kyu,Cho, Eun Jin
, p. 4203 - 4206 (2016/03/19)
A method for visible-light-induced synthesis of polyheteroaromatics from 2-heteroaryl-substituted anilines and heteroarylalkynes was developed. The process, which uses fac-Ir(ppy)3 as the photocatalyst and tBuONO as the diazotization reagent, is highly regioselective.
Programmed synthesis of arylthiazoles through sequential C-H couplings
Tani, Satoshi,Uehara, Takahiro N.,Yamaguchi, Junichiro,Itami, Kenichiro
, p. 123 - 135 (2014/01/06)
A programmed synthesis of privileged arylthiazoles via sequential C-H couplings catalyzed by palladium or nickel catalysts has been accomplished. This versatile protocol can supply all possible arylthiazole substitution patterns (2-aryl, 4-aryl, 5-aryl, 2
Reigoselective arylation of thiazole derivatives at 5-position via Pd catalysis under ligand-free conditions
Liu, Xiang-Wei,Shi, Jiang-Ling,Yan, Jia-Xuan,Wei, Jiang-Bo,Peng, Kun,Dai, Le,Li, Chen-Guang,Wang, Bi-Qin,Shi, Zhang-Jie
supporting information, p. 5774 - 5777 (2013/12/04)
An efficient regioselective arylation of thiazole derivatives via Pd-catalyzed C-H activation is reported. The transformation was hypothesized through a Pd(0/II) catalytic cycle in the absence of special ligand sets. This method provided an efficient proc
Direct arylation of simple azoles catalyzed by 1,10-phenanthroline containing palladium complexes: An investigation of C4 arylation of azoles and the synthesis of triarylated azoles by sequential arylation
Shibahara, Fumitoshi,Yamaguchi, Eiji,Murai, Toshiaki
experimental part, p. 2680 - 2693 (2011/06/20)
Direct triarylation and sequential triarylation reactions of simple azoles catalyzed by [Pd(phen)2]PF6 are described. Simple azoles, such as N-methylimidazole, thiazole, and oxazole, were observed to undergo triaryaltion reactions even at their C4 positions when treated with aryl iodides in the presence of [Pd(phen)2]PF6 as a catalyst and a stoichiometric amount of Cs2CO3 in DMA at 150 °C. Using excess amounts of azoles, selective C5 monoarylation was achieved by using the same catalytic system. Subsequent efforts demonstrated that C5 arylated azoles undergo exclusive C2 arylation using [Pd(phen)2]PF6 as the catalyst with galvinoxyl as an additive. Finally, unprecedented C4 arylation reactions of 2,5-diaryl-azoles occur by using the new catalytic system to give the corresponding triarylated products in good to excellent yields. The results of mechanistic studies suggest that the C2 arylation process takes place by way of an electrophilic aromatic substitution (SEAr) palladation pathway, while arylation reactions at the C4 position occur via a SEAr palladation and/or radical mechanism. Finally, a concise, three-step synthesis of the Tie-2 Tyrosine Kinase Inhibitor has been executed starting with commercially available N-methylimidazole by a route that employs the new sequential arylation process.
Palladium-catalyzed decarboxylative cross-coupling reaction between heteroaromatic Carboxylic acids and Aryl halides
Bilodeau, Francois,Brochu, Marie-Christine,Guimond, Nicolas,Thesen, Kris H.,Forgione, Pat
experimental part, p. 1550 - 1560 (2010/06/12)
"Chemical Equation Presented" A full overview of the decarboxylative cross-coupling reaction between heteroaromatic carboxylic acids and aryl halides is described. This transformation employs palladium catalysts with short reaction times providing facile synthesis of aryl-substituted heteroaromatics. The effect of each reaction parameter including solvent, base, and additive employed as well as the full substrate scope of this transformation are reported. Mechanistic evidence is also disclosed that sheds light on possible reaction pathways.
Synthesis of 5-arylthiazoles. Comparative study between Suzuki cross-coupling reaction and direct arylation
Primas, Nicolas,Bouillon, Alexandre,Lancelot, Jean-Charles,El-Kashef, Hussein,Rault, Sylvain
experimental part, p. 5739 - 5746 (2009/12/03)
A facile synthetic route to the new thiazol-5-ylboronic acid pinacol ester was described herein. Its reactivity toward Suzuki cross-coupling reaction was studied to provide various 5-arylthiazoles. A comparative study between Suzuki cross-coupling reactio
Efficient access to 5-substituted thiazoles by a novel metallotropic rearrangement
Zambon, Alfonso,Borsato, Giuseppe,Brussolo, Stefania,Frascella, Pietrogiulio,Lucchini, Vittorio
, p. 66 - 69 (2008/09/17)
A novel rearrangement process involving the migration of trimethylstannanyl or trimethylsilanyl groups around the thiazole ring provides access to either 2- or 5-metallated thiazoles by tuning the reaction conditions. The proposed mechanism, based on expe
Facile generation of a library of 5-aryl-2-arylsulfonyl-1,3-thiazoles
Sheldrake, Peter W.,Matteucci, Mizio,McDonald, Edward
, p. 460 - 462 (2007/10/03)
Treatment of N,N-diformylaminomethyl aryl ketones with phosphorus pentasulfide/triethylamine in chloroform gives 5-arylthiazoles directly in good yield. The 5-aryl-1,3-thiazole core has been successfully functionalised at the 2-position to yield, over two
