Quinaldine CAS 91-63-4

This substance is a key starting material for the synthesis of quinoline based antimalarial drugs and occupies a core position in the research and production of antimalarial drugs. Malaria is a major global infectious disease caused by malaria parasites, and quinoline drugs are the first-line drugs for treating malaria. The quinoline nucleus in their molecular structure is a key group for exerting anti malaria activity. As a 2-methyl substituted quinoline, it provides necessary spatial configuration and electronic effects for drug molecules through the synergistic effect of methyl and quinoline rings, ensuring anti malaria activity.

Specifically, 2-methylquinoline is first oxidized and halogenated to form 2-methyl-4-chloroquinoline, which then undergoes a condensation reaction with N, N-diethylpentanediamine to ultimately form chloroquine; Hydroxychloroquine is obtained by hydroxylating the side chain amino group on the basis of chloroquine synthesis. Clinical studies have confirmed that this type of drug inhibits DNA replication and transcription by embedding into the double stranded DNA of malaria parasites, while interfering with the heme metabolism pathway of malaria parasites, leading to the accumulation of heme toxicity and thus killing the malaria parasites.

In vitro anti malarial activity tests have shown that some derivatives have inhibitory activity against Plasmodium falciparum comparable to chloroquine, and exhibit significant activity against chloroquine resistant strains. For example, compounds such as (E) -2-ethoxy-4- (2- (8-hydroxyquinolin-2-yl) vinyl) phenyl acetate have a half maximal inhibitory concentration (IC ₅₀) against malaria parasites as low as 0.2 μ g/mL and low cytotoxicity to human cells, indicating good potential for drug development.

Its absorption spectrum can cover the "photodynamic therapy window" of 650-800nm and can penetrate deep tissues, producing a large amount of reactive oxygen species (ROS) under specific wavelength light, inducing tumor cell apoptosis.At the same time, this type of dye has near-infrared fluorescence emission characteristics and can be used as a fluorescent probe for tumor diagnosis, achieving precise diagnosis and treatment integration of tumors. In addition, the N - substituted -2- methylquinoline derivatives produced by Quinaldine through structural modification can inhibit the tyrosine kinase activity related to tumor cell proliferation, and have a significant inhibitory effect on lung cancer and breast cancer cell lines.

The halogenated derivatives of antibacterial and antifungal drug 2-methylquinoline (such as 2-methyl-4-iodoquinol) have broad-spectrum antibacterial activity and have inhibitory effects on pathogenic bacteria such as Staphylococcus aureus and Escherichia coli, as well as fungi such as Candida albicans. Its mechanism of action is to disrupt the integrity of microbial cell membranes, inhibit the synthesis of nucleic acids and proteins, and can be used to prepare topical antibacterial ointments, oral disinfectants, etc.

During the vulcanization process, this compound can act as a promoter to increase the cross-linking density of rubber, thereby improving its aging resistance. High cross-linking density helps to improve the physical and mechanical properties as well as aging resistance of rubber.

In the effective vulcanization system (EV), by increasing the amount of accelerator and reducing the amount of sulfur, the content of polysulfide crosslinking bonds (- Sx -) can be reduced, thereby improving the heat and oxygen aging resistance of the vulcanized rubber.

Some vulcanization systems containing this compound can reduce the phenomenon of vulcanization reversion, which is very important for improving the aging resistance and stability of rubber products.

By modifying the molecular structure of 2-methylquinoline, such as introducing lipophilic groups and altering its charge properties, its efficiency across the blood-brain barrier can be improved. For example, introducing long-chain alkyl and other lipophilic groups onto 2-methylquinoline molecules can increase their lipophilicity, making it easier to pass through the blood-brain barrier.

By utilizing receptors on the membrane of brain microvascular endothelial cells, such as transferrin receptors and insulin receptors, specific ligands are designed to bind to 2-methylquinoline and transport it into the brain through receptor-mediated endocytosis.

Encapsulating 2-methylquinoline in nanoparticles such as liposomes, polymer nanoparticles, etc. can improve its stability and efficiency across the blood-brain barrier. Nanoparticles can accumulate in brain tumors or inflammatory sites through enhanced permeability and retention effect (EPR effect), thereby achieving targeted delivery of 2-methylquinoline.