10.1107/S0108270104024424
The study focuses on the synthesis and crystal structure analysis of a mononuclear silver(I) complex, specifically bis(2-aminopyridine-xN')(benzoato-xO)silver(I), and its comparison with a polymeric 2-aminopyrimidine-Ag compound. The main objective was to investigate the relationship between the starting materials and the resulting structures, and to understand how different ligands influence the formation of metal-organic compounds. In the experiment, silver(I) oxide (Ag,O) and benzoic acid were used as starting materials to form the silver(I) complex, while 2-aminopyrimidine was employed as a tridentate ligand to obtain the polymeric compound. These chemicals served the purpose of creating distinct structural arrangements in the resulting metal-organic compounds, which were then analyzed for their crystal structures and coordination geometries. The study aimed to contribute to the understanding of inorganic supramolecular chemistry, particularly in the construction of polymeric silver(I) coordination networks, and to explore the potential of these compounds for functional solid materials with controllable properties.
10.1016/S0040-4039(00)94151-0
The research focuses on the development of a novel and versatile synthesis method for heterocyclic aldehydes using dialkyl 3-oxo-1-alkenyl-phosphonates. The primary purpose of this study is to explore a three-step transformation process that begins with the preparation of 1,2-epoxy-3-oxoalkyl-phosphonates from 1-alkenyl-phosphonates. These epoxyphosphonates then react with ambident nucleophiles, such as thiourea, 2-amino-pyridine, 2-amino-pyrimidine, and ethyl 2-pyridylacetate, to form dialkyl 1-hetaryl-1-hydroxymethyl-phosphonates. The final step involves mild alkaline treatment to yield the desired heterocyclic aldehydes. The study concludes that α-hydroxyalkyl-phosphonates are significant synthons for carbonyl functions, and the method provides a new route for generating carbonyl units.
10.1016/j.ejmech.2012.03.007
The study investigates the synthesis and biological evaluation of a series of 2-aminopyrimidine based 4-aminoquinoline compounds designed to combat malaria, particularly against drug-resistant strains of Plasmodium falciparum. The researchers synthesized these compounds using a protocol that involved the transformation of 3,4-dihydropyrimidin-2(1H)-ones (DHPMs) into 2-aminopyrimidines linked to 4-aminoquinolines. The compounds were evaluated for their in vitro anti-plasmodial activity against both chloroquine-sensitive (CQS) and chloroquine-resistant (CQR) strains of P. falciparum. The study found that some of these compounds, notably 10r, exhibited potent anti-plasmodial activity, with IC50 values significantly lower than that of chloroquine (CQ), especially against the CQR strain. The structure-activity relationship (SAR) analysis revealed that the length and nature of the spacer connecting the pharmacophores, as well as the presence of substituents like nitro groups, influenced the compounds' potency. The mode of action studies indicated that these compounds bind to heme and m-oxo-heme, inhibiting the formation of b-hematin, similar to CQ. Additionally, the compounds showed binding affinity to DNA, particularly AT-rich DNA, suggesting another potential mechanism of action. Molecular docking analysis with Pf DHFR further supported the compounds' ability to interact with this enzyme, which is crucial for the parasite's DNA biosynthesis. Overall, the study highlights the potential of these hybrid compounds as new anti-malarial agents with activity against drug-resistant strains.