In this project, a recently synthesized DABCO-based catalyst is entrapped in agar to reduce its moisture sensitivity leading to enhancement of its stability and catalytic activity. After preparation and identification this new reagent is used as an efficient and environmentally safe catalyst for the preparation of 1, 2, 4-triazoloquinazolinone and some pyrimidine derivatives. This method is accompanied with some superiorities such as, simple operation, mild and green conditions, use of low cost and non-hazardous natural material, short reaction times, easy preparation methods and simple work-up procedures. The prepared catalyst can be re-used for several times in all of the studied reactions without any appreciable loss in its activity.
Download full-text PDF |
Source |
---|---|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7518970 | PMC |
http://dx.doi.org/10.1016/j.molstruc.2020.129336 | DOI Listing |
Cent Eur J Public Health
December 2024
Department of Public Health and Hygiene, Faculty of Medicine, Pavol Jozef Safarik University in Kosice, Kosice, Slovak Republic.
Objective: This study aims to describe the outcomes of COVID-19 patients treated with molnupiravir and to explore the associations with various risk factors.
Methods: We conducted a single-centre, descriptive, retrospective study without a comparison group.
Results: Out of 141 patients, 70 (49.
Mol Divers
January 2025
School of Pharmacy, Shandong Second Medical University, Weifang, 261053, Shandong, People's Republic of China.
Non-small cell lung cancer (NSCLC) is the most common type of lung cancer, often linked to overexpression or abnormal activation of the epidermal growth factor receptor (EGFR). The issue of developing resistance to third-generation EGFR kinase inhibitors, such as osimertinib, underscores the urgent need for new therapies to overcome this resistance. Our findings revealed that compound A8 exhibits 88.
View Article and Find Full Text PDFACS Omega
January 2025
Biomolecular Measurement Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States.
RNA undergoes oxidatively induced damage in living organisms analogous to DNA. RNA is even more vulnerable to damage than DNA due to its greater abundance, single-strandedness, lack of repair and chromatin proteins shield, and instability, among other effects. RNA damage can adversely affect gene expression, leading to protein synthesis alterations, cell death, and other detrimental biological consequences.
View Article and Find Full Text PDFJ Am Chem Soc
January 2025
Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States.
Under most conditions, 2,4-dihalopyrimidines undergo substitution reactions at C4. Here we report that Pd(II) precatalysts supported by bulky -heterocyclic carbene ligands uniquely effect C2-selective cross-coupling of 2,4-dichloropyrimidine with thiols. The regioselectivity of this reaction stands in stark contrast to ∼1500 previously reported Pd-catalyzed cross-couplings that favor C4 in the absence of other substituents on the pyrimidine ring.
View Article and Find Full Text PDFThiouracil (2-thiouracil) is a thyrostat used to promote weight gain in cattle. However, its use is prohibited within the European Union (EU), necessitating the monitoring of its presence in bovine urine for beef exports to the EU. In this study, we present the development and validation of a quantitative method for the determination of 2-thiouracil, 4-thiouracil, and 6-methyl-2-thiouracil in bovine urine using liquid chromatography-tandem mass spectrometry (LC-MS/MS).
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!