Category: 151266-23-8

Chemo-enzymatic cascade processes are invaluable due to their ability to rapidly construct high-value products from available feedstock chemicals in a one-pot relay manner. In an article, author is Sinditskii, Valery P., once mentioned the application of 151266-23-8, Name is 3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine, molecular formula is C5H4IN5, molecular weight is 261.02, MDL number is MFCD03787931, category is pyrimidines. Now introduce a scientific discovery about this category, Category: pyrimidines.

Thermal Decomposition of 1,3,5,5-Tetranitrohexahydro-Pyrimidine: A New Type of Autocatalysis that Persists at High Temperatures

The thermal stability of 1,3,5,5- tetranitrohexahydropyrimidine (TNDA) in liquid phase under isothermal conditions was studied. It was established that the TNDA decomposition (k(liq)=3.1 . 10(21).exp(-26865/T), E-a=223.4 kJ mol(-1)) is accompanied by strong autocatalysis (k(cat)=9.8 . 10(14).exp(-18056/T), E-a=150.2 kJ mol(-1)). The mechanism of autocatalysis was proposed. The essence of autocatalysis is the oxidation of TNDA by decomposition products, followed by the destruction of the molecule. An unusual feature of this autocatalysis is that, in contrast to autocatalysis of nitroesters, the process does not disappear at high temperatures, but rather determines the kinetics of heat release in the combustion wave. The surface temperature and combustion mechanism of TNDA were established through thermocouple studies. It was shown that the autocatalysis reaction at the surface temperature controls the burning rate.

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Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

Synthetic Route of 151266-23-8, Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, 151266-23-8, Name is 3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine, SMILES is NC1=C2C(NN=C2I)=NC=N1, belongs to pyrimidines compound. In a article, author is Pfeiffer, Martin, introduce new discover of the category.

Reverse C-glycosidase reaction provides C-nucleotide building blocks of xenobiotic nucleic acids

C-Analogues of the canonical N-nucleosides have considerable importance in medicinal chemistry and are promising building blocks of xenobiotic nucleic acids (XNA) in synthetic biology. Although well established for synthesis of N-nucleosides, biocatalytic methods are lacking in C-nucleoside synthetic chemistry. Here, we identify pseudouridine monophosphate C-glycosidase for selective 5-beta -C-glycosylation of uracil and derivatives thereof from pentose 5-phosphate (d-ribose, 2-deoxy-d-ribose, d-arabinose, d-xylose) substrates. Substrate requirements of the enzymatic reaction are consistent with a Mannich-like addition between the pyrimidine nucleobase and the iminium intermediate of enzyme (Lys166) and open-chain pentose 5-phosphate. beta -Elimination of the lysine and stereoselective ring closure give the product. We demonstrate phosphorylation-glycosylation cascade reactions for efficient, one-pot synthesis of C-nucleoside phosphates (yield: 33 – 94%) from unprotected sugar and nucleobase. We show incorporation of the enzymatically synthesized C-nucleotide triphosphates into nucleic acids by RNA polymerase. Collectively, these findings implement biocatalytic methodology for C-nucleotide synthesis which can facilitate XNA engineering for synthetic biology applications.C-nucleosides are analogues of the canonical N-nucleosides and, despite their synthetic value, biocatalysis has not targeted them yet. Here, the authors report a pseudouridine monophosphate C-glycosidase enzyme for selective 5-beta -C-glycosylation of uracil and its derivatives from pentose 5- phosphate substrates.

Synthetic Route of 151266-23-8, Each elementary reaction can be described in terms of its molecularity, the number of molecules that collide in that step. The slowest step in a reaction mechanism is the rate-determining step.you can also check out more blogs about 151266-23-8.

Reference:
Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

In an article, author is Liu, Rui-Xue, once mentioned the application of 151266-23-8, Name is 3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine, molecular formula is C5H4IN5, molecular weight is 261.02, MDL number is MFCD03787931, category is pyrimidines. Now introduce a scientific discovery about this category, Quality Control of 3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine.

The copper(II) complexes of new anthrahydrazone ligands: In vitro and in vivo antitumor activity and structure-activity relationship

Two new copper(II) complexes, 9-PMAH-Cu (1) and 9-FPMAH-Cu (2), of anthrahydrazone were synthesized and structurally characterized, in which 9-FPMAH (9-(4′-trifluoromethyl)-pyrimidine anthrahydrazone) is the 4′-CF3 derivative of 9-PMAH (9-pyrimidine anthrahydrazone). Both complexes 1 and 2 showed similar intercalative binding modes towards DNA and might compete with the typical DNA intercalator, GelRed, in the same binding site. They could also act as topoisomerase (type I) suppressor to effectively inhibit its activity, in which complex 1 was more effective than 2. The in vitro antitumor screening indicated that complex 1 displayed much higher antiproliferative ability than 2 and cisplatin towards all the tested tumor cell lines. On the other hand, complex 1 also showed high cytotoxicity against human normal liver cell line HL-7702, suggesting it is a potential high cytotoxic antitumor candidate. While it was also suggested that the loss of activity of complex 2 might be due to the presence of 4′-CF3 on the pyrimidine ring. Studies on the cellular level showed that complex 1 could arrest the cell cycle of the most sensitive T-24 cells at G2/M phase and induced cell apoptosis. Complex 1 further showed a significant suppression on the tumor growth on the T-24 tumor xenograft mouse model, but not reduced the body weight. Especially, complex 1 could retain its coordination state in H2O even in the presence of HSA. The results suggests that complex 1 is of enough safety to be considered as a promising anticancer candidate by combining the bioactive Cu(II) and the anthrahydrazone pharmacophore.

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Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 151266-23-8, Name is 3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine, SMILES is NC1=C2C(NN=C2I)=NC=N1, in an article , author is Araie, Yuki, once mentioned of 151266-23-8, Application In Synthesis of 3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine.

Combined use of chemically modified nucleobases and nanostructured DNA for enhanced immunostimulatory activity of CpG oligodeoxynucleotide

Oligodeoxynucleotide (ODN) containing a cytosine-phosphate-guanine (CpG) motif, or CpG ODN, is considered suitable for treating immune diseases, including allergies. Although the phosphorothioate modification is used to enhance the stability and immunostimulatory activity of CpG ODNs, it is associated with the risk of adverse effects. Construction of nanostructured DNA assemblies, such as tripod- and hexapod-like structured DNAs, tripodna and hexapodna, respectively, were also found to increase this activity. The chemical modification of nucleobases could be another approach for enhancing CpG ODN activity. Here, we examined whether chemically modified nucleobase substitutions can enhance CpG ODN activity by measuring tumor necrosis factor alpha (TNF-alpha) release after addition to murine macrophage-like RAW264.7 cells. First, the guanine at the 18th position of phosphodiester CpG 1668 was substituted with several chemically modified guanines, and then the various guanines were substituted. Among all tested substitutions, 15,18-(th)dG, in which two guanines outside the CpG motif were substituted with the 2-aminothieno[3,4-d]pyrimidine guanine mimic ((th)dG), was the most effective. Compared to P-32-CpG 1668, P-32-15,18-(th)dG was taken up more efficiently by the RAW264.7 cells. Then, 15,18-(th)dG was incorporated into tripodna and hexapodna. 15,18-(th)dG/tri-or hexapodna induced higher TNF-alpha release from the RAW264.7 cells than PO CpG 1668/tri-or hexapodna, respectively. These results indicate that the( th)dG substitution is a useful effective strategy for enhancing the immunostimulatory activity of CpG DNAs in both single stranded and DNA nanostructure forms.

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Reference:
Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

Electric Literature of 151266-23-8, The transformation of simple hydrocarbons into more complex and valuable products via catalytic C¨CH bond functionalisation has revolutionised modern synthetic chemistry. 151266-23-8, Name is 3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine, SMILES is NC1=C2C(NN=C2I)=NC=N1, belongs to pyrimidines compound. In a article, author is Avvadukkam, Jayashree, introduce new discover of the category.

A facile synthesis of pyrano[2,3-d:6,5-d ‘]dipyrimidines via microwave-assisted multicomponent reactions catalyzed by beta-cyclodextrin

A facile three-component reaction of aromatic aldehyde, 2,2-dimethyl-1,3-dioxane-4,6-dione, and 6-amino-1,3-dimethyluracil was developed for the first time using beta-cyclodextrin (beta-CD) as a macrocyclic host for aldehyde and an efficient catalyst that leads to a batch of novel pyrano[2,3-d:6,5-d ‘]dipyrimidines (4a-k). The synthesis was accomplished with the aid of microwave irradiations in solvent-free conditions. The product obtained was in contrast to the previous report in which a similar reaction resulted in a mixture of benzylidenepyrimidine and bisaminopyrimidine analogs in the presence of triethylbenzylammonium chloride in an aqueous medium. The formation of the pyrano[2,3-d:6,5-d ‘]dipyrimidines may be in virtue of the property of beta-CD to construct new C-C and C-X (where X = heteroatom) bonds. Reusability of the catalyst up to three runs without any noteworthy change in catalytic activity is one of the main features of the reaction. Other noteworthy features are good to excellent yields, eco-friendly procedure, non-column chromatographic purification, and mild conditions.

Electric Literature of 151266-23-8, Enzymes are biological catalysts that produce large increases in reaction rates and tend to be specific for certain reactants and products. I hope my blog about 151266-23-8 is helpful to your research.

Reference:
Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 151266-23-8, Name is 3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine, SMILES is NC1=C2C(NN=C2I)=NC=N1, belongs to pyrimidines compound. In a document, author is Deorukhkar, Neel, introduce the new discover, Name: 3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine.

Tuning spin-crossover transition temperatures in non-symmetrical homoleptic meridional/facial [Fe(didentate)(3)](2+) complexes: what for and who cares about it?

The [FeN6] chromophores found in [Fe(didentate)(3)](2+) complexes, where didentate is a non-symmetrical 2-(6-membered-heterocyclic ring)-benzimidazole ligand (Lk), exist as mixtures of two geometrical mer (C-1-symmetry) and fac (C-3-symmetry) isomers. Specific alkyl-substituted six-membered heterocyclic rings connected to the benzimidazole unit (pyridines in ligands L1-L3, pyrazines in L4-L5 and pyrimidines in L6-L7) control the ligand field strength and the electron delocalization so that [Fe-II(Lk)(3)](2+) display tunable thermally-induced spin transitions in solution. Thermodynamic, spectroscopic (UV-Vis, NMR) and magnetic studies in solution demonstrate that [Fe(L6)(3)](2+) (L6 = 1-methyl-2-(pyrimidin-2-yl)-1H-benzo[d] imidazole) exhibits a close to room temperature spin transition (T-1/2 = 273(3) K) combined with a high stability formation constant (logo beta(Fe,L6)(1,3)) = 21.8(9) in acetonitrile), which makes this complex suitable for the potential modulation of lanthanide-based luminescence in polymetallic helicates. A novel method is proposed for assigning specific thermodynamic spin crossover parameters to fac-[Fe(L6)(3)](2+) and mer-[Fe (L6)(3)](2+) isomers in solution. The observed difference relies mainly on the entropic content Delta S-SCO(mer) – Delta S-SCO(fac) = 11(1) J mol(-1) K-1, which favors the spin transition for the meridional isomer. Intermolecular interactions occurring in the crystalline state largely overcome minor thermodynamic trends operating in diluted solutions and a single configurational isomer is usually observed in the solid state. Among the thirteen solved crystal structures 1-13 containing the [M(Lk)(3)](2+) cations (M = Fe, Ni, Zn, Lk = L6-L7), pure meridional isomers are observed six times, pure facial isomers also six times and a mixture (44% mer and 56% fac) is detected only once. Solid-state magnetic data recorded for the Fe-II complexes show the operation of slightly cooperative spin transitions in 7 (fac-[Fe(L6)(3)](2+)) and 12 (mer-[Fe(L7)(3)](2+)). For the meridional isomer in 6, a two-step spin state transition curve, associated with two phase transitions, is detected.

The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 151266-23-8 is helpful to your research. Name: 3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine.

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Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

In an article, author is Petaccia, Manuela, once mentioned the application of 151266-23-8, Product Details of 151266-23-8, Name is 3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine, molecular formula is C5H4IN5, molecular weight is 261.02, MDL number is MFCD03787931, category is pyrimidines. Now introduce a scientific discovery about this category.

Fluorescent molecular rotors as sensors for the detection of thymidine phosphorylase

Three new fluorescent molecular rotors were synthesized with the aim of using them as sensors to dose thymidine phosphorylase, one of the target enzymes of 5-fluorouracil, a potent chemotherapic drug largely used in the treatment of many solid tumors, that acts by hindering the metabolism of pyrimidines. 5-Fluorouracil has a very narrow therapeutic window, in fact, its optimal dosage is strictly related to the level of its target enzymes that vary significantly among patients, and it would be of the utmost importance to have an easy and fast method to detect and quantify them. The three molecular rotors developed as TP sensors differ in the length of the alkylic spacer joining the ligand unit, a thymine moiety, and the fluorescent molecular rotor, a [4-(1-dimethylamino)phenyl]-pyridinium bromide. Their ability to trigger an optical signal upon the interaction with thymidine phosphorylase was investigated by fluorescent measurements.

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Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

Chemistry is the experimental science by definition. We want to make observations to prove hypothesis. For this purpose, we perform experiments in the lab. , Product Details of 151266-23-8, 151266-23-8, Name is 3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine, molecular formula is C5H4IN5, belongs to pyrimidines compound. In a document, author is Elkina, Natalia A., introduce the new discover.

Competitive routes to cyclizations of polyfluoroalkyl-containing 2-tolylhy-drazinylidene-1,3-diketones with 3-aminopyrazoles into bioactive pyrazoloazines

The reaction of polyfluomalkyl-containing 2-tolylhydrazinylidene-1,3-diketones with 3-aminopyrazoles depending on their structure can proceed as N,N-cyclization to form 5-R-F- and 7-R-F-regioisomeric pyrazolo [1,5-a]pyrimidines (at that haloform cleavage to non-fluorinated pyrazolo[1,5-a]pyrimidine-7-ones is typical of 7-polyfluoroalkyl-containing isomers) or as C,N-cyclization to give 4-polyfluoroalkylpyrazolo [3,4-b]pyridines. The analogous transformations of non-fluorinated 3-tolylhydrazinylidenepentane-2,4-dione led to pyrazolo [1,5-a] pyrimidines only. Antiviral effect against influenza and Coxsackie viruses, analgesic activity and acute toxicity of some synthesized pyrazoloazines were evaluated.

A reaction mechanism is the microscopic path by which reactants are transformed into products. Each step is an elementary reaction. In my other articles, you can also check out more blogs about 151266-23-8. Product Details of 151266-23-8.

Reference:
Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Computed Properties of C5H4IN5, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 151266-23-8, Name is 3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine, molecular formula is C5H4IN5. In an article, author is Aydin, Busra O.,once mentioned of 151266-23-8.

Synthesis of N-alkylated pyrazolo[3,4-d]pyrimidine analogs and evaluation of acetylcholinesterase and carbonic anhydrase inhibition properties

Fused pyrimidines, especially pyrazolo[3,4-d]pyrimidines, are among the most preferred building blocks for pharmacology studies, as they exhibit a broad spectrum of biological activity. In this study, new derivatives of pyrazolo[3,4-d]pyrimidine were synthesized by alkylation of the N1 nitrogen atom. We synthesized 3-iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine 2 from commercially available aminopyrazolopyrimidine 1 using N-iodosuccinimide as an iodinating agent. The synthesis of compound 2 started with nucleophilic substitution of 3-iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine with R-X (X: -OMs, -Br, -Cl), affording N-alkylated pyrazolo[3,4-d]pyrimidine. We performed this synthesis using a weak inorganic base and the mild temperature was also used for a two-step procedure to generate N-alkylated pyrazolo[3,4-d]pyrimidine derivatives. Also, all compounds were tested for their ability to inhibit acetylcholinesterase (AChE) and the human carbonic anhydrase (hCA) isoforms I and II, with K-i values in the range of 15.41 +/- 1.39-63.03 +/- 10.68 nM for AChE, 17.68 +/- 1.92-66.27 +/- 5.43 nM for hCA I, and 8.41 +/- 2.03-28.60 +/- 7.32 nM for hCA II. Notably, compound 10 was the most selective and potent CA I inhibitor with a significant selectivity ratio of 26.90.

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Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia

Chemistry is traditionally divided into organic and inorganic chemistry. The former is the study of compounds containing at least one carbon-hydrogen bonds. 151266-23-8, Name is 3-Iodo-1H-pyrazolo[3,4-d]pyrimidin-4-amine, molecular formula is C5H4IN5, belongs to pyrimidines compound, is a common compound. In a patnet, author is Feckova, Michaela, once mentioned the new application about 151266-23-8, Computed Properties of C5H4IN5.

Photophysics of 9,9-Dimethylacridan-Substituted Phenylstyrylpyrimidines Exhibiting Long-Lived Intramolecular Charge-Transfer Fluorescence and Aggregation-Induced Emission Characteristics

Six pyrimidine-based push-pull systems substituted at positions C2 and C4/6 with phenylacridan and styryl moieties, employing methoxy or N,N-diphenylamino donors, have been designed and synthesized through cross-coupling and Knoevenagel reactions. X-ray analysis confirmed that the molecular structure featured the acridan moiety arranged perpendicularly to the residual pi system. Photophysical studies revealed significant differences between the methoxy and N,N-diphenylamino chromophores. Solvatochromic studies revealed that the methoxy derivatives showed dual emission in polar solvents. Time-resolved spectroscopy revealed that the higher energy band involved very fast (<80 ps) fluorescence, whereas the lower energy one included long components (approximate to 30 ns) due to long-lived intramolecular charge-transfer fluorescence. In contrast to N,N-diphenylamino chromophores, the methoxy derivatives also showed aggregation-induced emission in mixtures of THF/water, as well as dual emission in thin films, covering almost the whole visible spectrum with corresponding chromaticity coordinates not far from that of pure white light. These properties render the methoxy derivatives as very promising organic materials for white organic light-emitting diodes. We¡¯ll also look at important developments in the pharmaceutical industry because understanding organic chemistry is important in understanding health, medicine, 151266-23-8. The above is the message from the blog manager. Computed Properties of C5H4IN5.

Reference:
Pyrimidine | C4H4N2 – PubChem,
,Pyrimidine – Wikipedia