Pyrimidines

Foldenyi, R. published the artcileSelectivity in oxidation reactions of methylthio-substituted pyrimidines and triazines, Formula: C5H5ClN2S, the main research area is methylthiopyrimidine oxidation; pyrimidine methylthio oxidation; triazine methylthio oxidation.

It was found during the oxidation of methylthio-substituted pyrimidines and 1,3,5-triazines that pyrimidinesulfones were obtained in better yield than triazinesulfones because the oxidation is influenced by the structure and substitution of the heterocycles and it could not be selectively stopped at this level. Depending on pH and solvent, the methylsulfonyl and the formed methylsulfonium groups can rapidly take part in nucleophilic substitution reactions resulting in hydroxylated and methoxylated triazines and pyrimidines. These reactions may be utilized in such processes where the methylthio substituted heterocycles are formed as byproducts. After oxidation, the nucleophilic substitution leads to the desired products.

Hungarian Journal of Industrial Chemistry published new progress about Oxidation. 38275-42-2 belongs to class pyrimidines, name is 5-Chloro-2-(methylthio)pyrimidine, and the molecular formula is C5H5ClN2S, Formula: C5H5ClN2S.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Benneche, Tore published the artcileSelective oxidations and syntheses of α-halomethylthiopyrimidines, Recommanded Product: 5-Chloro-2-(methylthio)pyrimidine, the main research area is pyrimidine halomethylthio preparation oxidation; oxidation selective halomethylthiopyrimidine; sulfide pyrimidinyl selective oxidation; sulfoxide halomethyl pyrimidinyl.

The molybdenum peroxide complex, MoO3.(Me2N)3PO.H2O was a useful reagent for the oxidation of sulfides to sulfones, in particular for the oxidation of a 2-[(iodomethyl)thio]pyrimidine to its sulfone. The α-chloro analog has also prepared by m-ClC6H4C(O)OOH (I) oxidation α-Halo sulfoxides were prepared selectively by I oxidations Synthesis of the α-halo sulfides are described.

Chemica Scripta published new progress about Oxidation. 38275-42-2 belongs to class pyrimidines, name is 5-Chloro-2-(methylthio)pyrimidine, and the molecular formula is C5H5ClN2S, Recommanded Product: 5-Chloro-2-(methylthio)pyrimidine.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Prakash, Anjanappa published the artcileEfficient indoles and anilines syntheses employing tert-butyl sulfinamide as ammonia surrogate, HPLC of Formula: 38275-56-8, the main research area is aniline sulfinamide tert butyl preparation; aryl halide amination tert butyl sulfinamide palladium catalyst; indole preparation bromophenylethyne cross coupling tert butyl sulfinamide palladium.

Tert-Bu sulfinamide is an ammonia equivalent for the palladium-catalyzed amination of aryl bromides and aryl chlorides. Using these amine derivatives, it has been observed that substituted indoles and anilines with sensitive functional groups can be readily prepared This surrogate has also been used for the synthesis of indoles from (2-bromophenyl)ethynes using palladium-catalyzed cross coupling reaction as the key step.

Tetrahedron Letters published new progress about Amination. 38275-56-8 belongs to class pyrimidines, name is 5-Chloropyrimidine-2-carbonitrile, and the molecular formula is C5H2ClN3, HPLC of Formula: 38275-56-8.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Mizukami, Satoshi published the artcileIonization constants of some 4,5-substituted 2-methylpyrimidines, SDS of cas: 5472-46-8, the main research area is .

An extension of the Hammett’s equation to pyrimidines is attempted. The basic ionization constants of 4,5-substituted 2-methylpyrimidines are determined potentiometrically or spectrophotometrically. The base strengths are proportional to σm (for 5-substituent) and σp (for 4-substituent) values. A method is developed for the use of the Hammett’s equation in the elucidation of the amino-imino tautomerism and the protonation equilibrium of 4-aminopyrimidines.

Journal of Organic Chemistry published new progress about Ionization. 5472-46-8 belongs to class pyrimidines, name is Ethyl 4-amino-2-methylpyrimidine-5-carboxylate, and the molecular formula is C8H11N3O2, SDS of cas: 5472-46-8.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Hirai, Eizo published the artcileBehavior of 4-amino-5-carboxy-2-methylpyrimidine in aqueous solution, Safety of Ethyl 4-amino-2-methylpyrimidine-5-carboxylate, the main research area is .

cf. CA 64, 17396e. MeI (4 ml.) added to 1 g. 4-amino-5-ethoxycarbonyl-2-methylpyrimidine in 10 ml. Me2CO, the mixture refluxed 1 hr., and the precipitate formed on cooling heated 1 hr. on a steam bath with 10 ml. 5% HI gave 0.6 g. hemihydrate of the 1-methyl betaine of 4-amino-5-carboxy-2-methylpyrimidine, decomposed 226-7° (aqueous alc.). The 1-methyl betaine of 2-aminonicotinic acid, decomposed 269-71°, and the 1-methyl betaine of 2-aminoisonicotinic acid were similarly prepared The basic ionization constants of 2-aminonicotinic acid (I) and 2-aminoisonicotinic acid (II) and of their Me and Et esters and 1-methyl betaines, and of 4-amino-5-carboxy-2-methylpyrimidine (III) and its Et ester and 1-methyl betaine were determined potentiometrically and spectrophotometrically. The basic pKa values of I and II were much lower than those calculated from the Hammett eq. I and II exist largely as zwitterions in H2O. On the basis of the uv absorption spectra of I-III as compared with those of the corresponding Et esters and 1-methyl betaines, I-III exist predominantly as zwitterions in H2O. An evaluation of the equilibrium constants between the zwitterion form and uncharged form in H2O for I and III from the Edsall and Blanchard equation (CA 27, 5233) is in agreement with this conclusion. Ir spectra of I-III in the solid state show that the compounds form an uncharged polymer linked by H bonding between the carboxyl and a nuclear N.

Chemical & Pharmaceutical Bulletin published new progress about Ionization. 5472-46-8 belongs to class pyrimidines, name is Ethyl 4-amino-2-methylpyrimidine-5-carboxylate, and the molecular formula is C8H11N3O2, Safety of Ethyl 4-amino-2-methylpyrimidine-5-carboxylate.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Mizukami, Satoshi published the artcileRelation between pKa (H2O) of 5-substituted 4-amino-2-methylpyrimidines and half neutralization potential and the behavior of the compounds in nonaqueous solvents., Product Details of C8H11N3O2, the main research area is PYRIMIDINE SYSTEM; METHYLPYRIMIDINE SYSTEM; AMINOMETHYLPYRIMIDINE SYSTEM.

The half neutralization point (HNP) values and potentiometric inflections at the end point in potentiometric titrations were determined for 5-substituted 4-amino-2-methylpyrimidines (substituent = H, CH2OH, CH2NH2, CONH2, CO2Et, CO2H, CHO, or CN) in the following nonaqueous solvents: HOAc, HOAc-Me2CO, HOAc-MeCN, MeOH, EtOH, iso-PrOH, iso-PrOH-HOCH2CH2OH, Me2CO, MeCOEt, iso-BuCOMe, and MeCN. The determinations were effectively made in acidic and dipolar aprotic solvents. With some exceptions, there was a linear relation between the HNP values and the pKa (H2O) values, and between the HNP values and the Hammett σm. Deviations from these relations are discussed. Differential titration of a mixture of 5-hydroxy- and 5-formyl-4-amino-2-methylpyrimidines (I) in various solvents indicated that the power of a solvent to differentiate the mixture increased with increasing Hammett values; a dipolar aprotic solvent of low dielec. constant is recommended for titration of a mixture of the bases with HClO4. From the Hammett equation and uv spectra, these pyrimidines exist largely as the amino form in the solvents and in H2O; the true proton acceptor is the 1-position of the ring. Some abnormal results obtained with I and 5-(aminomethyl)-4-amino-2-methylpyrimidines (II) are explained by chem. reactions. II (0.15 g.) dissolved in 100 ml. Me2CO by warming at 40° or by standing 2 days gave 0.18 g.4-amino-5-(isopropylideneiminomethyl)-2-methylpyrimidine (III), leaflets, m. 151-2°. III (0.2 g.) heated 2 hrs. at 100° with 5 ml. 5% gave II.HCl and Me2CO. III (0.5 g.) in 15 ml. tetrahydrofuran treated slowly at room temperature with 0.5 g. LiAlH4, the mixture stirred 1.5 hrs., H2O added slowly to the cold mixture, and the mixture acidified with HCl gave 4-amino-5-(isopropylideneiminomethyl)-2-methyl-pyrimidine di-HCl (IV), decomposing at 284-5° (aqueous alc.). 4-Amino-5-(chloromethyl)-2-methylpyrimidine (1 g.), 3 g. (Me3)2CHNH2, and 20 ml. EtOH heated at 100° in a sealed tube 2 hrs., and the product in EtOH-Et2O treated with HCl gas gave 1.4 g. IV. A mixture of 1 g. I and 30 ml. absolute MeOH containing 4% dry HCl held 3 hrs. at room temperature and then basified with NaOMe gave 0.7 g. I di-Me acetal, m. 108.5-9° (MeOH); I di-Et acetal, m. 66-8°, was similarly prepared

Chemical & Pharmaceutical Bulletin published new progress about Ionization. 5472-46-8 belongs to class pyrimidines, name is Ethyl 4-amino-2-methylpyrimidine-5-carboxylate, and the molecular formula is C8H11N3O2, Product Details of C8H11N3O2.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Reddy, Ambati V. Raghava published the artcileSynthesis and characterization of impurities in the production process of lopinavir, Quality Control of 192725-50-1, the main research area is lopinavir synthesis impurity; Lopinavir; Related substances; Synthesis and Characterization of impurities.

Lopinavir is an antiretroviral drug used for the inhibition of HIV protease. Four related substances of lopinavir were observed during the manufacturing process of lopinavir in the laboratory and they were identified. The present work describes the origin, synthesis, characterization, and control of these related substances.

Scientia Pharmaceutica published new progress about Impurities. 192725-50-1 belongs to class pyrimidines, name is (S)-3-Methyl-2-(2-oxotetrahydropyrimidin-1(2H)-yl)butanoic acid, and the molecular formula is C9H16N2O3, Quality Control of 192725-50-1.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Budesinsky, Zdenek published the artcileOn the synthesis of 4- and 5-pyrimidinyldiphenyl-(1-imidazolyl)methanes and their antifungal activity, Formula: C8H9BrN2O2S, the main research area is pyrimidinyldiphenylmethane imidazolyl; imidazolylpyrimidinyldiphenylmethane; fungicide imidazolylpyrimidinyldiphenylmethane; Grignard reaction pyrimidinecarboxylate.

The title compounds I (R1 = Me, SMe; R2 = Cl, Br; R3 = 1-imidazolyl) and II (R3 = 1-imidazolyl) were prepared by treating the corresponding pyrimidinyldiphenylmethanols I (R1 and R2 = as above, R3 = OH) (III) and II (R3 = OH) (IV) with thionylbisimidazole prepared in situ from SOCl2 and imidazole in MeCN solution III and IV were obtained by the Grignard reaction from the appropriately substituted Et pyrimidinecarboxylates and PhMgBr but Et 4-methyl-2-methylthio-5-pyrimidinecarboxylate gave with PhMgBr Et 1,6-dihydro-4-methyl-2-methylthio-6-phenyl-5-pyrimidinecarboxylate. 5-Bromo-2-methylthiopyrimidine failed to give Grignard’s reagent with Mg but reacted with EtMgBr yielding 5-bromo-3,4-dihydro-4-ethyl-2-methylthiopyrimidine. Three I and II were tested against Saccharomyces pasterianus, Trichophyton mentagrophytes, Candida albicans, and Aspergillus niger and showed weaker antifungal activities compared with clotrimazole.

Collection of Czechoslovak Chemical Communications published new progress about Fungicides. 74840-38-3 belongs to class pyrimidines, name is Ethyl 5-bromo-2-(methylthio)pyrimidine-4-carboxylate, and the molecular formula is C8H9BrN2O2S, Formula: C8H9BrN2O2S.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Garzo, G. published the artcileGas chromatographic determination of 5-alkyluracils and 5-alkyldeoxyuridines using flash methylation and glass capillary columns, Recommanded Product: 5-N-Propyluracil, the main research area is uracil uridine derivative chromatog.

A sensitive anal. method was developed for 5-alkyl-substituted deoxyuridines and their main metabolites, the corresponding uracils in body fluids. The compound to be determined was methylated by the “”flash”” methylation technique, i.e., by injecting a mixture of the compounds and trimethylanilinium hydroxide (TMAH) into the hot injector of a gas chromatograph, followed by separation of the derivatives with a suitably deactivated glass capillary column. The optimal conditions for methylation were found by studying the effect of injector temperature, residence time, and TMAH/compound molar ratio on the yield of the reaction. The optimal residence time of the sample in the injector could be set by a “”semi-splitless”” injection method.

Journal of Chromatography published new progress about Body fluid. 19030-75-2 belongs to class pyrimidines, name is 5-N-Propyluracil, and the molecular formula is C7H10N2O2, Recommanded Product: 5-N-Propyluracil.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Tarazon, Estefania published the artcileCirculating Sphingosine-1-Phosphate as A Non-Invasive Biomarker of Heart Transplant Rejection, Recommanded Product: 5-Chloro-2-(methylthio)pyrimidine, the main research area is sphingosine phosphate non invasive biomarker heart transplant rejection.

Accumulating evidence has confirmed that the expression of sarcoplasmic reticulum calcium ATPase 2a (SERCA2a) is downregulated in heart failure and cardiac allograft rejection. Although many SERCA2a-related genes and proteins involved in the regulation of myocardial Ca2+ fluxes have been explored, its related metabolites remain poorly studied. Our main objective was to identify circulating SERCA2a-related metabolites altered in cardiac allograft rejection and to determine whether these could serve as non-invasive biomarkers. Sixty plasma samples from adult heart transplant were included in a metabolomic anal. Sphingosine-1 phosphate (S1P), metabolite closely related with SERCA, were increased in patients with cardiac rejection (p < 0.0001). S1P discriminated between patients with and without rejection: normal grafts vs. all rejecting grafts (AUC = 0.911, p < 0.0001), normal grafts vs. Grade 1 R (AUC = 0.819, p < 0.01), Grade 2 R (AUC = 0.911, p < 0.0001), Grade 3 R (AUC = 0.996, p < 0.0001). In addition, we found changes in key enzymes and receptors of S1P pathway analyzed on explanted hearts from heart failure patients. This preliminary study reveals that circulating S1P determination could be a novel approach to detect cardiac rejection, showing a robust capability for detection that improves gradually with the severity of rejection. These alterations could be relevant to better understand the involvement of calcium regulation on the pathophysiol. of rejection. Scientific Reports published new progress about Biomarkers. 38275-42-2 belongs to class pyrimidines, name is 5-Chloro-2-(methylthio)pyrimidine, and the molecular formula is C5H5ClN2S, Recommanded Product: 5-Chloro-2-(methylthio)pyrimidine.

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia