Pyrimidines

Fedotov, Daniil A.; Paul, Alexander C.; Koch, Henrik; Santoro, Fabrizio; Coriani, Sonia; Improta, Roberto published an article in 2022, the title of the article was Excited state absorption of DNA bases in the gas phase and in chloroform solution: a comparative quantum mechanical study.Product Details of 65-71-4 And the article contains the following content:

We study the excited state absorption (ESA) properties of the four DNA bases (thymine, cytosine, adenine, and guanine) by different single reference quantum mech. methods, namely, equation of motion coupled cluster singles and doubles (EOM-CCSD), singles, doubles and perturbative triples (EOM-CC3), and time-dependent d. functional theory (TD-DFT), with the long-range corrected CAM-B3LYP functional. Preliminary results at the Tamm-Dancoff (TDA) CAM-B3LYP level using the maximum overlap method (MOM) are reported for thymine. In the gas phase, the three methods predict similar One Photon Absorption (OPA) spectra, which are consistent with the exptl. results and with the most accurate computational studies available in the literature. The ESA spectra are then computed for the ππ* states (one for pyrimidine, two for purines) associated with the lowest-energy absorption band, and for the close-lying nπ* state. The EOM-CC3, EOM-CCSD and CAM-B3LYP methods provide similar ESA spectral patterns, which are also in qual. agreement with literature RASPT2 results. Once validated in the gas phase, TD-CAM-B3LYP has been used to compute the ESA in chloroform, including solvent effects by the polarizable continuum model (PCM). The predicted OPA and ESA spectra in chloroform are very similar to those in the gas phase, most of the bands shifting by less than 0.1 eV, with a small increase of the intensities and a moderate destabilization of the nπ* state. Finally, ESA spectra have been computed from the min. of the lowest energy ππ* state, and found in line with the available exptl. transient absorption spectra of the nucleosides in solution, providing further validation of our computational approach. The experimental process involved the reaction of 5-Methylpyrimidine-2,4(1H,3H)-dione(cas: 65-71-4).Product Details of 65-71-4

The Article related to thymine cytosine nucleobase excited state absorption transient spectra, Physical Organic Chemistry: Other Reactions, Processes, and Spectra and other aspects.Product Details of 65-71-4

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

On October 15, 2016, Hu, Yanjing; Hu, Hanbin; Li, Yingying; Chen, Ruixin; Yang, Yu; Wang, Lei published an article.HPLC of Formula: 626-48-2 The title of the article was Supramolecular assemblies of tetrafluoroterephthalic acid and N-heterocycles via various strong hydrogen bonds and weak C-H···F interactions: Synthons cooperation, robust motifs and structural diversity. And the article contained the following:

A series of organic solid states including three salts, two co-crystals, and three hydrates based on tetrafluoroterephthalic acid (H2tfBDC) and N-bearing ligands (2,4-(1H,3H)-pyrimidine dione (PID), 2,4-dihydroxy-6-Me pyrimidine (DHMPI), 2-amino-4,6-dimethyl pyrimidine (ADMPI), 2-amino-4,6-dimenthoxy pyrimidine (ADMOPI), 5,6-dimenthyl benzimidazole (DMBI), 2-aminobenzimidazole (ABI), 3,5-di-Me pyrazole (DMP), and 3-cyanopyridine (3-CNpy)), namely, [(PID)2·(H2tfBDC)] (1), [(DHMPI)2·(H2tfBDC)] (2), [(H-ADMPI+)2·(tfBDC2-)·2(H2O)] (3), [(H-ADMOPI+)2·(tfBDC2-)·(H2O)] (4), [(H-DMBI+)2·(tfBDC2-)·2(H2O)] (5), [(H-ABI+)2·(tfBDC2-)] (6), [(H-DMP+)·(HtfBDC-)] (7), and [(H-3-CNpy+)·(HtfBDC-)] (8), were synthesized by solvent evaporation method. Crystal structures analyses show that the F atom of the H2tfBDC participates in multiple C-H···F hydrogen bond formations, producing different supramol. synthons. The weak hydrogen bonding C-H···F and N-H···F play an important part in constructing the diversity structures 2-8, except in crystal 1. In complexes 1-3, they present the same synthon R22(8) with different N-heterocyclic compounds, which may show the strategy in constructing the supramol. Meanwhile, the complex 3 exhibits a 2D layer, and the independent mols. of water exist in the adjacent layers. In complexes 4 and 5, the water mols. connect the neighboring layers to form 3D network by strong O-H···O hydrogen bonding. These crystals 1-8 were fully characterized by single-crystal X-ray crystallog., elemental anal., IR spectroscopy (IR), and thermogravimetric anal. (TGA). The experimental process involved the reaction of 6-Methylpyrimidine-2,4(1H,3H)-dione(cas: 626-48-2).HPLC of Formula: 626-48-2

The Article related to supramol assemble tetrafluoroterephthalic acid nitrogen heterocycle hydrogen bond tga, Physical Organic Chemistry: Other Reactions, Processes, and Spectra and other aspects.HPLC of Formula: 626-48-2

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Mattelaer, H.-P.; Mattelaer, C.-A.; Papastavrou, N.; Dehaen, W.; Herdewijn, P. published an article in 2017, the title of the article was Oligonucleotide promoted peptide bond formation using a tRNA mimicking approach.Computed Properties of 4433-40-3 And the article contains the following content:

TransferRNA’s role in protein translation is the prime example of an Informational Leaving Group (ILG). A simplified model produced oligophenylalanine with a modified uracil as an ILG in the presence of specific oligonucleotides. Our preliminary studies contribute to the importance of hybrid species in bridging the gap between peptides and nucleic acids. The experimental process involved the reaction of 5-(Hydroxymethyl)pyrimidine-2,4(1H,3H)-dione(cas: 4433-40-3).Computed Properties of 4433-40-3

The Article related to peptide bond formation informational leaving group oligonucleotide photolysis, oligophenylalanine uracil synthesis hybrid species aminolysis kinetics ph peptidomimetic, Amino Acids, Peptides, and Proteins: Poly(Amino Acids) and Peptides and other aspects.Computed Properties of 4433-40-3

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Hamilton-Miller, J. M. T.; Grey, Daphne published an article in 1975, the title of the article was Resistance to trimethoprim in klebsiellae isolated before its introduction.Reference of 5-(3,4,5-Trimethoxybenzyl)pyrimidine-2,4-diamine 2-hydroxypropanoate And the article contains the following content:

In vitro 6 of 12 strains of Klebsiella aerogenes or K. ozaenae were resistant to trimethoprim lactate (I lactate) [23256-42-0], whereas all 12 strains were resistant to sulfamethoxazole [723-46-6]. All of these 12 strains were isolated and freeze-dried (1961-64) prior to clin. use of I. Of the 6 I-resistant strains, 5 were also resistant to tetracycline, chloramphenicol, and streptomycin. No evidence was found for R-factor involvement in I resistance. The experimental process involved the reaction of 5-(3,4,5-Trimethoxybenzyl)pyrimidine-2,4-diamine 2-hydroxypropanoate(cas: 23256-42-0).Reference of 5-(3,4,5-Trimethoxybenzyl)pyrimidine-2,4-diamine 2-hydroxypropanoate

The Article related to trimethoprim resistance klebsiella, sulfamethoxazole resistance klebsiella, Biochemical Interactions: Microbial Systems and other aspects.Reference of 5-(3,4,5-Trimethoxybenzyl)pyrimidine-2,4-diamine 2-hydroxypropanoate

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Lu, Chen; Gutierrez-Bayona, Natalia Eugenia; Taylor, John-Stephen published an article in 2021, the title of the article was The effect of flanking bases on direct and triplet sensitized cyclobutane pyrimidine dimer formation in DNA depends on the dipyrimidine, wavelength and the photosensitizer.Application of 65-71-4 And the article contains the following content:

Cyclobutane pyrimidine dimers (CPDs) are the major products of DNA produced by direct absorption of UV light, and result in C to T mutations linked to human skin cancers. Most recently a new pathway to CPDs in melanocytes has been discovered that has been proposed to arise from a chemisensitized pathway involving a triplet sensitizer that increases mutagenesis by increasing the percentage of C-containing CPDs. To investigate how triplet sensitization may differ from direct UV irradiation, CPD formation was quantified in a 129-mer DNA designed to contain all 64 possible NYYN sequences. CPD formation with UVB light varied about 2-fold between dipyrimidines and 12-fold with flanking sequence and was most frequent at YYYR and least frequent for GYYN sites in accord with a charge transfer quenching mechanism. In contrast, photosensitized CPD formation greatly favored TT over C-containing sites, more so for norfloxacin (NFX) than acetone, in accord with their differing triplet energies. While the sequence dependence for photosensitized TT CPD formation was similar to UVB light, there were significant differences, especially between NFX and acetone that could be largely explained by the ability of NFX to intercalate into DNA. The experimental process involved the reaction of 5-Methylpyrimidine-2,4(1H,3H)-dione(cas: 65-71-4).Application of 65-71-4

The Article related to cyclobutane pyrimidine dimer photosensitizer wavelength photosensitization, Placeholder for records without volume info and other aspects.Application of 65-71-4

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Thirkell, D.; Blankson, M. published an article in 1981, the title of the article was The speciation of coliform genera from above and below a sewer outfall and their susceptibilities to antimicrobial agents.Recommanded Product: 5-(3,4,5-Trimethoxybenzyl)pyrimidine-2,4-diamine 2-hydroxypropanoate And the article contains the following content:

The occurrence of coliforms in a small water course increased by a factor of 36 below the outfall of a sewage treatment plant. Speciation of the bacteria from above and below the sewer outfall showed that Escherichia coli and Enterobacter species predominated. Drug-resistance levels were significant in microorganisms from both sampling sites, and the occurrence of a significant number of multiple-resistant microorganisms, particularly E. coli, is reported. Both E. coli and Enterobacter species from below the sewer outfall showed a statistically significant increase in resistance to ampicillin [69-53-4] as compared with isolates from above the outfall, and E. coli from below the outfall also showed a statistically significant increase in resistance to sulphamethoxazole [723-46-6]. The experimental process involved the reaction of 5-(3,4,5-Trimethoxybenzyl)pyrimidine-2,4-diamine 2-hydroxypropanoate(cas: 23256-42-0).Recommanded Product: 5-(3,4,5-Trimethoxybenzyl)pyrimidine-2,4-diamine 2-hydroxypropanoate

The Article related to coliform bacteria sewage antibiotic sensitivity, taxonomy coliform bacteria sewage, Biochemical Interactions: Microbial Systems and other aspects.Recommanded Product: 5-(3,4,5-Trimethoxybenzyl)pyrimidine-2,4-diamine 2-hydroxypropanoate

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

On April 13, 2021, Pandey, Renu; Collins, Meghan; Lu, Xiyuan; Sweeney, Shannon R.; Chiou, Jennifer; Lodi, Alessia; Tiziani, Stefano published an article.Reference of 5-(Hydroxymethyl)pyrimidine-2,4(1H,3H)-dione The title of the article was Novel Strategy for Untargeted Chiral Metabolomics using Liquid Chromatography-High Resolution Tandem Mass Spectrometry. And the article contained the following:

Stereospecific recognition of metabolites plays a significant role in the detection of potential disease biomarkers thereby providing new insights in diagnosis and prognosis. D-Hdroxy/amino acids are recognized as potential biomarkers in several metabolic disorders. Despite continuous advances in metabolomics technologies, the simultaneous measurement of different classes of enantiomeric metabolites in a single anal. run remains challenging. Here, we develop a novel strategy for untargeted chiral metabolomics of hydroxy/amine groups (-OH/-NH2) containing metabolites, including all hydroxy acids (HAs) and amino acids (AAs), by chiral derivatization coupled with liquid chromatog.-high resolution tandem mass spectrometry (LC-HR-MS/MS). Diacetyl-tartaric anhydride (DATAN) was used for the simultaneous derivatization of-OH/-NH2 containing metabolites as well as the resulting diastereomers, and all the derivatized metabolites were resolved in a single anal. run. Data independent MS/MS acquisition (DIA) was applied to pos. identify DATAN-labeled metabolites based on reagent specific diagnostic fragment ions. We discriminated chiral from achiral metabolites based on the reversal of elution order of D and L isomers derivatized with the enantiomeric pair (±) of DATAN in an untargeted manner. Using the developed strategy, a library of 301 standards that consisted of 214 chiral and 87 achiral metabolites were separated and detected in a single anal. run. This approach was then applied to investigate the enantioselective metabolic profile of the bone marrow (BM) and peripheral blood (PB) plasma samples from patients with acute myeloid leukemia (AML) at diagnosis and following completion of the induction phase of chemotherapeutic treatment. The sensitivity and selectivity of the developed method enabled the detection of trace levels of the D-enantiomer of HAs and AAs in primary plasma patient samples. Several of these metabolites were significantly altered in response to chemotherapy. The developed LC-HR-MS method entails a valuable step forward in chiral metabolomics. The experimental process involved the reaction of 5-(Hydroxymethyl)pyrimidine-2,4(1H,3H)-dione(cas: 4433-40-3).Reference of 5-(Hydroxymethyl)pyrimidine-2,4(1H,3H)-dione

The Article related to untargeted chiral metabolomics liquid chromatog high resolution mass spectrometry, tandem, Placeholder for records without volume info and other aspects.Reference of 5-(Hydroxymethyl)pyrimidine-2,4(1H,3H)-dione

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

On August 20, 2021, Peach, Jesse T.; Wilson, Stephanie M.; Gunderson, Logan D.; Frothingham, Lizzi; Tran, Tan; Walk, Seth T.; Yeoman, Carl J.; Bothner, Brian; Miles, Mary P. published an article.HPLC of Formula: 4433-40-3 The title of the article was Temporal metabolic response yields a dynamic biosignature of inflammation. And the article contained the following:

Chronic low-grade inflammation is a subclin. condition directly and indirectly linked to the development of a wide range of diseases responsible for the vast majority of morbidity. To examine mechanisms coupled to chronic disease, a group of overweight and obese human subjects without known inflammatory diseases participated in a high-fat meal challenge as an acute inflammation stimulus. Anal. of serum metabolites grouped by baseline cytokine levels revealed that single samples had little power in differentiating groups. However, an anal. that incorporated temporal response separated inflammatory response phenotypes and allowed us to create a metabolic signature of inflammation which revealed metabolic components that are crucial to a cytokine-mediated inflammation response. The use of temporal response, rather than a single time point, improved metabolomic prediction of high postprandial inflammation responses and led to the development of a dynamic biosignature as a potential tool for stratifying risk to a wide range of diseases. The experimental process involved the reaction of 5-(Hydroxymethyl)pyrimidine-2,4(1H,3H)-dione(cas: 4433-40-3).HPLC of Formula: 4433-40-3

The Article related to metabolic response biosignature inflammation, metabolomics, pathophysiology, systems biology, Placeholder for records without volume info and other aspects.HPLC of Formula: 4433-40-3

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

Grey, Daphne; Hamilton-Miller, J. M. T. published an article in 1977, the title of the article was Sensitivity of Pseudomonas aeruginosa to sulfonamides and trimethoprim and the activity of the combination trimethoprim: sulfamethoxazole.Computed Properties of 23256-42-0 And the article contains the following content:

P. aeruginosa strains from urinary infections were resistant or only moderately sensitive to sulfadiazine [68-35-9], sulfamethoxazole (I) [723-46-6], sulfadimidine [57-68-1], or trimethoprim lactate (II lactate) [23256-42-0], but a marked synergy between I and II was noted with the moderately sensitive strains. Thus, therapeutically attainable urinary levels of these drugs (which were ineffective individually) were quite inhibitory to P. aeruginosa when used in combination. The min. inhibitory concentrations of I and II when used in combination suggested that disks containing I and II at a 1:2 ratio would be more appropriate for determining the drug susceptibility of urinary pathogens than the usual 1:20 ratio. The experimental process involved the reaction of 5-(3,4,5-Trimethoxybenzyl)pyrimidine-2,4-diamine 2-hydroxypropanoate(cas: 23256-42-0).Computed Properties of 23256-42-0

The Article related to sulfonamide trimethoprim pseudomonas sensitivity, urine pseudomonas trimethoprim sulfamethoxazole, Biochemical Interactions: Microbial Systems and other aspects.Computed Properties of 23256-42-0

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia

On May 25, 2018, Woodring, Jennifer L.; Bachovchin, Kelly A.; Brady, Kimberly G.; Gallerstein, Mitchell F.; Erath, Jessey; Tanghe, Scott; Leed, Susan E.; Rodriguez, Ana; Mensa-Wilmot, Kojo; Sciotti, Richard J.; Pollastri, Michael P. published an article.Category: pyrimidines The title of the article was Corrigendum to “Optimization of physicochemical properties for 4-Anilinoquinazoline inhibitors of trypanosome proliferation” [Eur. J. Med. Chem. 141 (2017) 446-459] [Erratum to document cited in CA167:595582]. And the article contained the following:

In the original publication, the acknowledgments section has information omitted; the correction is provided here. The experimental process involved the reaction of 4-(2-Bromopyrimidin-4-yl)morpholine(cas: 1209459-32-4).Category: pyrimidines

The Article related to anilinoquinazoline trypanosome inhibitor antimalarial malaria trypanosomiasis trypanosomicide erratum, Placeholder for records without volume info and other aspects.Category: pyrimidines

Referemce:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia