56734-10-2Relevant academic research and scientific papers
A general regioselective synthesis of 2,4-diarylpyrimidines from 2-thiouracil through two orthogonal cross-coupling reactions
?erňová, Miroslava,Pohl, Radek,Klepetá?ová, Blanka,Hocek, Michal
supporting information; experimental part, p. 1305 - 1308 (2012/06/30)
A novel efficient synthesis of 2,4-diarylpyrimidines was developed based on phosphonium-mediated Suzuki coupling of 2-(methylsulfanyl)pyrimidin-4(3H)-one (at position 4) followed by the Liebeskind-Srogl cross-coupling (at position 2) under microwave irradiation. Georg Thieme Verlag Stuttgart · New York.
Pyrimidine-core extended π-systems: General synthesis and interesting fluorescent properties
Itami, Kenichiro,Yamazaki, Daisuke,Yoshida, Jun-Ichi
, p. 15396 - 15397 (2007/10/03)
We have developed a simple but powerful synthetic strategy that permits the assembly of π-systems onto a pyrimidine core in a programmable and diversity-oriented format. The nucleophilic addition of ArLi to 2-methylthiopyrimidine, followed by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) oxidation, resulted in the production of 4-aryl-2-methylthiopyrimidines. The iterative reaction sequence then gave 4,6-diaryl-2-methylthiopyrimidines. The resulting adduct was further allowed to react with ArMgBr under the catalytic influence of NiCl2(dppe) to afford 2,4,6-triarylpyrimidines. By following this synthetic scheme, interesting pyrimidine-core π-systems were rapidly constructed in a programmable fashion. The successful discovery of a number of interesting fluorescent materials and properties (e.g., solvatofluorochromism) speaks well for the potential of our platform strategy in the development of functional organic materials. Copyright
Iron catalyzed cross coupling reactions of aromatic compounds
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Page/Page column 16, (2010/02/03)
A process for the production of compounds Ar—R1 by means of a cross-coupling reaction of an organometallic reagent R1—M with an aromatic or heteroaromatic substrate Ar—X catalyzed by one or several iron salts or iron complexes as catalysts or pre-catalysts, present homogeneously or heterogeneously in the reaction mixture. This new invention exhibits substantial advantages over established cross coupling methodology using palladium- or nickel complexes as the catalysts. Most notable aspects are the fact that (i) expensive and/or toxic nobel metal catalysts are replaced by cheap, stable, commercially available and toxicologically benign iron salts or iron complexes as the catalysts or pre-catalysts, (ii) commercially attractive aryl chlorides as well as various aryl sulfonates can be used as starting materials, (iii) the reaction can be performed under “ligand-free” conditons, and (iv) the reaction times are usually very short.
Iron-catalyzed cross-coupling reactions
Fuerstner, Alois,Leitner, Andreas,Mendez, Maria,Krause, Helga
, p. 13856 - 13863 (2007/10/03)
Simple iron salts such as FeCln, Fe(acac)n (n = 2,3) or the salen complex 4 turned out to be highly efficient, cheap, toxicologically benign, and environmentally friendly precatalysts for a host of cross-coupling reactions of alkyl o
Synthesis, antiviral (HSV-1) and antimycotic activities of ethyl or methyl 2,4-disubstituted 5-pyrimidinecarboxylates, 2,4-disubstituted 5-pyrimidinecarboxylic acids and 2,4-disubstituted pyrimidines
Sansebastiano,Mosti,Menozzi,Schenone,Muratore,Petta,Debbia,Pesce Schito,Schito
, p. 335 - 355 (2007/10/02)
The synthesis of ethyl or methyl 4-substituted or unsubstituted 2-methylthio-5-pyrimidinecarboxylates 3 a-i and 8 o mainly by reaction of ethyl or methyl 2-dimethylaminomethylene-3-oxoalkanoates with 2-methylisothiourea is described. Also some ethyl 2-sub
STANNYLATION REACTIONS AND CROSS-COUPLINGS IN PYRIMIDINES
Majeed, Amera J.,Antonsen, Oyvind,Benneche, Tore,Undheim, Kjell
, p. 993 - 1006 (2007/10/02)
Pyrimidines have been stannylated in the activated 4-position by thermal decarboxylation of the corresponding carboxylic organotin esters.The decarboxylation can be catalyzed by bis(acetonitrile)palladium(II) dichloride. 4-Iodopyrimidines are 4-stannylate
Regiochemistry in Pd-Catalysed Organotin Reactions with Halopyrimidines
Solberg, Jan,Undheim, Kjell
, p. 62 - 68 (2007/10/02)
Chlorines in activated pyrimidine position is replaced by carbon substituents in Pd-catalysed reactions with organotin compounds.The 4(6)-position is more reactive than the 2-position allowing for regioselective coupling in 2,4(6)-dihalopyrimidines.A bromine substituent is required for coupling in the benzenoid 5-position.In 5-bromo-2,4-dichloropyrimidine the 4-chlorine is replaced before the 5-bromine and the latter before the 2-chloro substituent, all in a regioselective manner.The methodology can be used to introduce functionalized carbon substituents into any pyrimidine position.
REACTIONS OF HETEROCYCLIC CATIONS WITH N-CONTAINING NUCLEOPHILES. 14. RECYCLIZATION OF 2,6-DIPHENYLPYRYLIUM PERCHLORATE UNDER THE INFLUENCE OF NUCLEOPHILES WITH AN N-C-N FRAGMENT
Zvezdina, E. A.,Zhdanova, M. P.,Giryavenko, I. I.
, p. 714 - 719 (2007/10/02)
The recyclization of 2,6-diphenylpyrylium perchlorate under the influence of isothioureas, guanidine, 2-aminobenzimidazoles, 2-aminonaphthimidazole, 2-aminothiazole, 2-aminobenzothiazole, and 2-aminopyridine was studied.The examined reactions lead to monocyclic or condensed pyrimidines.
(Substituted-phenyl)-1,2,4-triazolo[4,3-a]-pyrimidines and (substituted-phenyl)-1,2,4-triazolo[1,5-a]pyrimidines
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, (2008/06/13)
This disclosure describes substituted 1,2,4-triazolo[1,5-a]pyrimidines and substituted 1,2,4-triazolo[4,3-a]pyrimidines which possess anxiolytic activity.
