Category: pyridine-derivatives

Held, Katharina published the artcilePharmacological properties of TRPM3 isoforms are determined by the length of the pore loop, Computed Properties of 21829-25-4, the main research area is trpm3 pore loop length pharmacol property; Splice variants TRP channels; TRPM3; nociception.

Background and Purpose : Transient receptor potential melastatin 3 (TRPM3) is a non-selective cation channel that plays a pivotal role in the peripheral nervous system as a transducer of painful heat signals. Alternative splicing gives rise to several TRPM3 variants. The functional consequences of these splice isoforms are poorly understood. Here, the pharmacol. properties of TRPM3 variants arising from alternative splicing in the pore-forming region were compared. Exptl. Approach : Calcium microfluorimetry and patch clamp recordings were used to compare the properties of heterologously expressed TRPM3α1 (long pore variant) and TRPM3α2-α6 (short pore variants). Furthermore, site-directed mutagenesis was done to investigate the influence of the length of the pore loop on the channel function. Key Results : All short pore loop TRPM3α variants (TRPM3α2-α6) were activated by the neurosteroid pregnenolone sulfate (PS) and by nifedipine, whereas the long pore loop variant TRPM3α1 was insensitive to either compound In contrast, TRPM3α1 was robustly activated by clotrimazole, a compound that does not directly activate the short pore variants but potentiates their responses to PS. Clotrimazole-activated TRPM3α1 currents were largely insensitive to established TRPM3α2 antagonists and were only partially inhibited upon activation of the μ opioid receptor. Finally, by creating a set of mutant channels with pore loops of intermediate length, we showed that the length of the pore loop dictates differential channel activation by PS and clotrimazole. Conclusion and Implications : Alternative splicing in the pore-forming region of TRPM3 defines the channel’s pharmacol. properties, which depend critically on the length of the pore-forming loop.

British Journal of Pharmacology published new progress about Cerebellum. 21829-25-4 belongs to class pyridine-derivatives, name is Dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, and the molecular formula is C17H18N2O6, Computed Properties of 21829-25-4.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Gui, Yue published the artcilePolymorphic selectivity in crystal nucleation, Computed Properties of 21829-25-4, the main research area is polymorphic selectivity crystal nucleation glass forming liquid.

Crystal nucleation rates were measured in the supercooled melts of 2 richly polymorphic glass-forming liquids: 5-Me-2-[(2-nitrophenyl)amino]-3-thiophenecarbonitrile (ROY) and nifedipine (NIF). ROY is known for its crystals of red, orange, and yellow colors and many polymorphs of solved structures. Of the many polymorphs, ON (orange needles) nucleates the fastest with the runner up (Y04) trailing by a factor of 103 when compared under the same mobility-limited condition, while the other unobsd. polymorphs are slower yet by â‰? orders of magnitude. Of the 6 polymorphs of NIF, γ’ nucleates the fastest, β’ is slower by a factor of 10, and the rest are slower yet by â‰? decades. In both systems, the faster-nucleating polymorphs are not built from the lowest-energy conformers, while they tend to have higher energies and lower densities and thus greater similarity to the liquid phase by these measures. The temperature ranges of this study covered the glass transition temperature Tg of each system, and no evidence that the nucleation rate is sensitive to the passage of Tg were found. At the lowest temperatures studied, the rates of nucleation and growth are proportional to each other, indicating that a similar kinetic barrier controls both processes. The classical nucleation theory provides an accurate description of the observed nucleation rates if the crystal growth rate is used to describe the kinetic barrier for nucleation. The quant. rates of both nucleation and growth for the competing polymorphs enable prediction of the overall rate of crystallization and its polymorphic outcome. (c) 2022 American Institute of Physics.

Journal of Chemical Physics published new progress about Conformers. 21829-25-4 belongs to class pyridine-derivatives, name is Dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, and the molecular formula is C17H18N2O6, Computed Properties of 21829-25-4.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Brinkmann, Joscha published the artcileIn-Silico Screening of Lipid-Based Drug Delivery Systems, Application In Synthesis of 72509-76-3, the main research area is lipid based drug delivery system screening formulation; PC-SAFT; lipid-based formulations; solubility; thermodynamic modeling.

This work proposes an in-silico screening method for identifying promising formulation candidates in complex lipid-based drug delivery systems (LBDDS). The approach is based on a min. amount of exptl. data for API solubilites in single excipients. Intermol. interactions between APIs and excipients as well as between different excipients were accounted for by the Perturbed-Chain Statistical Associating Fluid Theory. The approach was applied to the in-silico screening of lipid-based formulations for ten model APIs (fenofibrate, ibuprofen, praziquantel, carbamazepine, cinnarizine, felodipine, naproxen, indomethacin, griseofulvin and glibenclamide) in mixtures of up to three out of nine excipients (tricaprylin, Capmul MCM, caprylic acid, Capryol 90, Lauroglycol FCC, Kolliphor TPGS, polyethylene glycol, carbitol and ethanol). For eight out of the ten investigated model APIs, the solubilities in the final formulations could be enhanced by up to 100 times compared to the solubility in pure tricaprylin. Fenofibrate, ibuprofen, praziquantel, carbamazepine are recommended as type I formulations, whereas cinnarizine and felodipine showed a distinctive solubility gain in type II formulations. Increased solubility was found for naproxen and indomethacin in type IIIb and type IV formulations. The solubility of griseofulvin and glibenclamide could be slightly enhanced in type IIIb formulations. The exptl. validation agreed very well with the screening results. The API solubility individually depends on the choice of excipients. The proposed in-silico-screening approach allows formulators to quickly determine most-appropriate types of lipid-based formulations for a given API with low exptl. effort.

Pharmaceutical Research published new progress about Cosolvents. 72509-76-3 belongs to class pyridine-derivatives, name is 3-Ethyl 5-methyl 4-(2,3-dichlorophenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate, and the molecular formula is C18H19Cl2NO4, Application In Synthesis of 72509-76-3.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Dantonio, Alyssa L. published the artcileIntersystem extrapolation factors are substrate-dependent for CYP3A4: impact on cytochrome P450 reaction phenotyping, Recommanded Product: 3-Ethyl 5-methyl 4-(2,3-dichlorophenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate, the main research area is intersystem extrapolation factor CYP3A4 reaction phenotyping pharmacokinetics.

The use of intersystem extrapolation factors (ISEF) is required for the quant. scaling of drug metabolism data generated in individually expressed cytochrome P 450 (CYP) enzymes when estimating fractional contribution (fm) to metabolism by P 450 enzymes in vivo. For successful prediction of fm, ISEF values must be universal across all substrates for any individual enzyme. In this study, ISEF values were generated for ten CYP3A4 selective substrates using a common source of recombinant heterologously expressed CYP3A4 (rCYP) and a pool of human liver microsomes. The resulting ISEF values for CYP3A4 were substrate-dependent and ranged 8-fold, with the highest value generated from intrinsic clearance of midazolam depletion (0.36) and the lowest from quinidine depletion (0.044). Application of these ISEF values for estimation of the fractional contribution of CYP3A4 and CYP2C19 to omeprazole clearance yielded values that ranged from 0.21-0.63 and 0.37-0.79, resp., as compared with back-extrapolated in vivo fm values of 0.27 (CYP3A4) and 0.85 (CYP2C19) from clin. pharmacokinetic data. For risperidone, estimated fm values for CYP3A4 and CYP2D6 ranged from 0.87-0.98 and 0.02-0.13, resp., as compared with in vivo values of 0.36 (CYP3A4) and 0.63-0.88 (CYP2D6), showing that the importance of CYP3A4 was overestimated, and the importance of CYP2D6 underestimated. Overall, these findings suggest that ISEF values for CYP3A4 can vary with the marker substrate used to derive them, thereby reducing the effectiveness of the approach of using metabolism data from rCYP3A4 with ISEF values for the prediction of fraction metabolized values in vivo.

Drug Metabolism & Disposition published new progress about Hepatocyte. 72509-76-3 belongs to class pyridine-derivatives, name is 3-Ethyl 5-methyl 4-(2,3-dichlorophenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate, and the molecular formula is C18H19Cl2NO4, Recommanded Product: 3-Ethyl 5-methyl 4-(2,3-dichlorophenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Ashworth, Ian W. published the artcileProcess Development of a Suzuki Reaction Used in the Manufacture of Lanabecestat, HPLC of Formula: 917471-30-8, the main research area is lanabecestat preparation; Suzuki coupling diethanolamine alkynylpyridinylboronate bromodispirocyclohexaneindaneimidazole key step; hydrolysis kinetics diethanolamine alkynylpyridinylboronate; effect diethanolamine removal palladium lanabecestat.

A process for preparation of the potential anti-Alzheimer’s agent lanabecestat was developed by coupling of an alkynylpyridinylboronic acid diethanolamine ester with a bromodispirocyclohexaneindaneimidazole in the presence of Pd(AmPhos)2Cl2 and K3PO4 in EtOH/H2O; the new process reduced the need for solvent changes and difficult isolation steps and decreased the amount of palladium detected in the final product without the use of solid-phase extractants. The kinetics of hydrolysis of the diethanolamine boronate and the free boronic acid was determined; diethanolamine generated in the hydrolysis decreased the rate of coupling but likely improved the purge of palladium from the product.

Organic Process Research & Development published new progress about Hydrolysis. 917471-30-8 belongs to class pyridine-derivatives, name is (5-(Prop-1-yn-1-yl)pyridin-3-yl)boronic acid, and the molecular formula is C8H8BNO2, HPLC of Formula: 917471-30-8.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Barraclough, Paul published the artcileInotropic ‘A’ ring substituted sulmazole and isomazole analogs, Synthetic Route of 33631-04-8, the main research area is inotropic sulmazole isomazole analog; imidazopyridine preparation inotropic.

A series of “”A”” ring substituted sulmazole I [R = 4-, 5-, 6-MeO, 5-NO2, 5-Cl, 5-Me, 5-Ac; X = S, S(O), O] and isomazole analogs II [R = 2-, 5-, 6-MeO, 5-NH2, 5-NO2; X = S, S(O), O] were prepared and evaluated as inotropic agents. Thus, 5-methoxy-2,3-pyridinediamine was cyclized with 2-methoxy-4-(methylthio)benzoic acid to give I (R = 5-MeO, X = S), which was oxidized to give I [R = 5-MeO, X = S(O)]. PKA’s, protonation sites, and log P values were measured for selected compounds and their electronic properties were calculated No simple correlation between inotropic activity and pKA, protonation site, or log P value was observed However, in vitro inotropism did correlate with the calculated charge d. of the “”B”” ring imidazo nitrogen atom. The 6-position of sulmazole appeared to be the most tolerant toward substituents, the 6-amino derivative I [R = 6-NH, X = S(O)] being a more potent inotrope than sulmazole itself. 4-Methoxyisomazole had comparable in vivo inotropic properties to those of isomazole.

Journal of Medicinal Chemistry published new progress about Inotropics. 33631-04-8 belongs to class pyridine-derivatives, name is 2-Methoxypyridine-3,4-diamine, and the molecular formula is C6H9N3O, Synthetic Route of 33631-04-8.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Barlin, G. B. published the artcileIonization constants of heterocyclic substances. IX. Protonation of aminopyridines and aminopyrimidinones, Product Details of C6H9N3O, the main research area is pyridines aminohydroxy ionization UV; basicity pyridines aminohydroxy; aminohydroxypyridine ionization UV; pyrimidines aminohydroxy ionization UV; protonation aminohydroxypyridine.

Ionization constants and uv spectra are reported for amino-2-hydroxypyridines (amino-2-pyridones), amino-4-hydroxypyridines(amino-4-pyridones), and amino-2,4-di-hydroxypryimidines (amino-2,4-pyrimidinediones) and their O-and ring N-Me derivatives Protonation of 3- and 5-amino-2-hydroxypyridines and 3,4-diamino-2-hydroxypyridine (I) occurs first at the amino group (the 3-NH2 of I), but 4- and 6-amino-2-hydroxypyridines and 2- and 3-amino-4-hydroxypyridines are protonated first at O. The most basic center of 4,5-diamino-2,6-dihydroxypyrimidine is the 5-NH2 group.

Journal of the Chemical Society [Section] B: Physical Organic published new progress about Ionization. 33631-04-8 belongs to class pyridine-derivatives, name is 2-Methoxypyridine-3,4-diamine, and the molecular formula is C6H9N3O, Product Details of C6H9N3O.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Puszko, A. published the artcile13C NMR spectra of 2,4-dihalopicolines and their N-oxides and IR spectra of 2-halopicoline N-oxides, 2,4-dihalopicoline N-oxides and 2-halo-4-nitropicoline N-oxides, Safety of 2,4-Dichloro-3-methylpyridine, the main research area is NMR IR spectra halopicoline; picoline halo NMR IR spectra; substituent effect NMR IR spectra halopicoline.

The 13C NMR and IR spectra of the title compounds were recorded and their spectral parameters assigned. The influence of electronic properties of the substituents on the direction of chem. shifts and νN-O values is discussed. The ratio between a substituted heterocyclic compound and its parent and the identically substituted benzene derivatives has been determined

Polish Journal of Chemistry published new progress about IR spectra. 132097-09-7 belongs to class pyridine-derivatives, name is 2,4-Dichloro-3-methylpyridine, and the molecular formula is C6H5Cl2N, Safety of 2,4-Dichloro-3-methylpyridine.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Kovacs, Kornel L. published the artcileHydrogen evolution from dithionite and hydrogen photoproduction by hydrogenase incorporated into various hydrophobic matrixes, Formula: C26H42Br2N2, the main research area is hydrogen photoproduction hydrogenase dithionite viologen; ruthenium bipyridyl hydrogenase hydrogen photoproduction; surfactant liposome hydrogenase hydrogen photoproduction; solar energy hydrogen photoproduction water.

The effects of surfactants, lipids, and amphiphilic viologen mediators on H production from Na2S2O4 and tris(2,2′-bipyridine)Ru(2+) [15158-62-0] sensitized H photoproduction by hydrogenae from Thiocapsa roseopersicina were studied. Three systems which differed as to the nature of the hydrophobic matrix around the hydrogenase were tested. An enhanced hydrogenase activity was observed in the presence of surfactants in the 1-6 mM concentration range. Hydrogenase showed a selectivity for the amphiphilic viologens. N,N’-Diheptyl-4,4′-dipyridinium dichloride  [54451-15-9] was the most efficient electron mediator in both reactions. H photoproduction was not feasible in the detergent-hydrogenase system because of intensive foaming. Hydrogenase incorporated into liposomes catalyzed H photoevolution efficiently but the rate was decreasing in time, though reversibly. Using intact bacterial cells instead of purified hydrogenase yielded stable H photoevolution for â‰?2 h. This system offers several advantages for potential practical applications.

Biochimie published new progress about Photolysis. 36437-30-6 belongs to class pyridine-derivatives, name is 1,1-Di-n-octyl-4,4-bipyridinium Dibromide, and the molecular formula is C26H42Br2N2, Formula: C26H42Br2N2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Utsey, Kiersten published the artcileQuantification of the impact of partition coefficient prediction methods on physiologically based pharmacokinetic model output using a standardized tissue composition, Computed Properties of 21829-25-4, the main research area is partition coefficient prediction physiol pharmacokinetic model standardized tissue composition.

Tissue:plasma partition coefficients are key parameters in physiol. based pharmacokinetic (PBPK) models, yet the coefficients are challenging to measure in vivo. Several mechanistic-based equations have been developed to predict partition coefficients using tissue composition information and the compound’s physicochem. properties, but it is not clear which, if any, of the methods is most appropriate under given circumstances. Complicating the evaluation, each prediction method was developed, and is typically employed, using a different set of tissue composition information, thereby making a controlled comparison impossible. This study proposed a standardized tissue composition for humans that can be used as a common input for each of the five frequently used prediction methods. These methods were implemented in R and were used to predict partition coefficients for 11 drugs, classified as strong bases, weak bases, acids, neutrals, and zwitterions. PBPK models developed in R (mrgsolve) for each drug and each set of partition coefficient predictions were compared with resp. observed plasma concentration data. Percent root mean square error and half-life percent error were used to evaluate the accuracy of the PBPK model predictions using each partition coefficient method as summarized by strong bases, weak bases, acids, neutrals, and zwitterions characterization. The anal. indicated that no partition coefficient method consistently yielded the most accurate PBPK model predictions. As such, PBPK model predictions using all partition coefficient methods should be considered during drug development.

Drug Metabolism & Disposition published new progress about Adipocyte. 21829-25-4 belongs to class pyridine-derivatives, name is Dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, and the molecular formula is C17H18N2O6, Computed Properties of 21829-25-4.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem