Category: 930-36-9

Iida, Keisuke published the artcileDisulfide-Catalyzed Iodination of Electron-Rich Aromatic Compounds, Recommanded Product: 1-Methylpyrazole, the publication is Journal of Organic Chemistry (2019), 84(11), 7411-7417, database is CAplus and MEDLINE.

Herein, a disulfide-catalyzed electrophilic iodination of aromatic compounds using 1,3-diiodo-5,5-dimethylhydantoin (DIH) has been developed. The disulfide activates DIH as a Lewis base to promote the iodination reaction in acetonitrile under mild conditions. This system is applicable to a wide range of electron-rich aromatic compounds, including acetanilide, anisole, imidazole, and pyrazole derivatives

Journal of Organic Chemistry published new progress about 930-36-9. 930-36-9 belongs to pyrazoles-derivatives, auxiliary class Pyrazole, name is 1-Methylpyrazole, and the molecular formula is C4H6N2, Recommanded Product: 1-Methylpyrazole.

Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics

Sanjeev, R. published the artcileStudy on associative and non-associative behavior of some 5-membered heterocycles with two and one hetero atoms and their N-methylated derivatives from surface tension data, Recommanded Product: 1-Methylpyrazole, the publication is Research Journal of Chemistry and Environment (2015), 19(2), 26-29, database is CAplus.

Simple 5-membered heterocycles and two of their Nmethylated derivatives with two hetero atoms viz. pyrazole, isoxazole isothiozole and 1-methylpyrazole and with one hetero atom viz. pyrrole, furan, thiophene and N-methylpyrrole have shown a discriminative behavior toward surface tension, E脰TV脰S constants (k), order of association (x). This was explained in terms of associative and nonassociative behavior of these eight compounds Trouton’s rule had negligible significance on the associative and non-associative behavior.

Research Journal of Chemistry and Environment published new progress about 930-36-9. 930-36-9 belongs to pyrazoles-derivatives, auxiliary class Pyrazole, name is 1-Methylpyrazole, and the molecular formula is C4H6N2, Recommanded Product: 1-Methylpyrazole.

Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics

Gao, Qingqing published the artcilePalladium-catalyzed polyannulation of pyrazoles and diynes toward multifunctional poly(indazole)s under monomer non-stoichiometric conditions, Application In Synthesis of 930-36-9, the publication is Polymer Chemistry (2019), 10(39), 5296-5303, database is CAplus.

A new synthetic route toward multifunctional poly(indazole)s (PIs) with an effect of monomer stoichiometry imbalance-promoted polymerization is described in this work. The palladium-catalyzed oxidative polyannulations of internal diynes and 1-methylpyrazole proceed smoothly in 1,4-dioxane at 120掳C with copper acetate monohydrate functioning as the oxidant. A series of PIs with high mol. weights (M_w up to 35 800) are generated in good yields (up to 84.0%) under monomer non-stoichiometric conditions. These polymers exhibit high thermal stability, losing merely 5% of their weights at high temperatures of 321-353掳C. The solid thin films of these PIs show high and UV-tunable refractive indexes (n = 1.8870-1.6051) in a wide wavelength range of 400-900 nm. The tetraphenylethene-containing PI shows obvious solid-state emission properties and good photosensitivity. Its thin film was successfully fabricated into a well-defined two-dimensional fluorescent photopattern with sharp edges.

Polymer Chemistry published new progress about 930-36-9. 930-36-9 belongs to pyrazoles-derivatives, auxiliary class Pyrazole, name is 1-Methylpyrazole, and the molecular formula is C4H6N2, Application In Synthesis of 930-36-9.

Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics

Erigoni, A. published the artcileHighly active hybrid mesoporous silica-supported base organocatalysts for C-C bond formation, Synthetic Route of 930-36-9, the publication is Catalysis Today (2020), 227-236, database is CAplus.

New base hybrid catalysts, based on silyl-derivatives of mols. carrying amino, diamino, pyrrolidine, pyrazolium and imidazolium functionalities were successfully achieved through post synthetic grafting onto M41S-type support. Different characterization techniques were implemented to study the characteristics of the materials, such as elemental anal., solid state MAS NMR and FTIR spectroscopies, X-ray diffraction (XRD), thermogravimetric and differential thermal analyses (TGA-DTA) and textural properties through N2 physisorption anal. The catalytic activity and recyclability of these compounds as base catalysts was demonstrated for C-C bond forming reactions such as Knoevenagel condensations and Michael additions rationalizing the differences observed as function of the reaction mechanisms. An enamine mechanism was proposed for Knoevenagel condensations and an enolate mechanism for Michael additions

Catalysis Today published new progress about 930-36-9. 930-36-9 belongs to pyrazoles-derivatives, auxiliary class Pyrazole, name is 1-Methylpyrazole, and the molecular formula is C4H6N2, Synthetic Route of 930-36-9.

Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics

Pony Yu, Renyuan published the artcileIron-catalysed tritiation of pharmaceuticals, COA of Formula: C4H6N2, the publication is Nature (London, United Kingdom) (2016), 529(7585), 195-199, database is CAplus and MEDLINE.

A thorough understanding of the pharmacokinetic and pharmacodynamic properties of a drug in animal models is a critical component of drug discovery and development. Such studies are performed in vivo and in vitro at various stages of the development process-ranging from preclin. absorption, distribution, metabolism and excretion (ADME) studies to late-stage human clin. trials-to elucidate a drug mol.’s metabolic profile and to assess its toxicity. Radiolabeled compounds, typically those that contain ¹⁴C or ³H isotopes, are one of the most powerful and widely deployed diagnostics for these studies. The introduction of radiolabels using synthetic chem. enables the direct tracing of the drug mol. without substantially altering its structure or function. The ubiquity of C-H bonds in drugs and the relative ease and low cost associated with tritium (³H) make it an ideal radioisotope with which to conduct ADME studies early in the drug development process. Here we describe an iron-catalyzed method for the direct ³H labeling of pharmaceuticals by hydrogen isotope exchange, using tritium gas as the source of the radioisotope. The site selectivity of the iron catalyst is orthogonal to currently used iridium catalysts and allows isotopic labeling of complementary positions in drug mols., providing a new diagnostic tool in drug development.

Nature (London, United Kingdom) published new progress about 930-36-9. 930-36-9 belongs to pyrazoles-derivatives, auxiliary class Pyrazole, name is 1-Methylpyrazole, and the molecular formula is C4H6N2, COA of Formula: C4H6N2.

Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics

Durka, Krzysztof published the artcileSynthesis, characterization and photoluminescence of 8-oxyquinolinato organoboron complexes derived from pyrazole, Category: pyrazoles-derivatives, the publication is Tetrahedron Letters (2017), 58(12), 1185-1189, database is CAplus.

A 1-pot protocol was developed for the synthesis of luminescent heteroleptic diaryldiborinic complexes containing the central aryl ring bonded to two B atoms substituted with pyrazole and complexed with 8-hydroxyquinoline. The luminescent properties of these compounds were measured. In dilute solutions they exhibited an emission at �13 nm with quantum yields of 22-27% which are typical for borinic 8-hydroxyquinoline complexes. The only exception was the complex containing the bithiophene scaffold, for which no fluorescence was observed The obtained pyrazole-based complexes show improved solubility and thermal stability with respect to their Ph analogs. The exptl. UV-visible absorption and emission data are supported by theor. calculations of the frontier MOs, revealing the aromatic linker to quinolinato ligand excitation mechanism.

Tetrahedron Letters published new progress about 930-36-9. 930-36-9 belongs to pyrazoles-derivatives, auxiliary class Pyrazole, name is 1-Methylpyrazole, and the molecular formula is C4H6N2, Category: pyrazoles-derivatives.

Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics

Zhang, Tong-wei published the artcileMeasurement and correlation of solubility of 1-methyl-3,4,5-trinitropyrazole in twelve pure solvents at temperatures from 283.15 K to 323.15 K, Synthetic Route of 930-36-9, the publication is Journal of Molecular Liquids (2020), 113895, database is CAplus.

In the present study, the solubility of 1-methyl-3,4,5-trinitropyrazole (MTNP) was determined by a dynamic laser monitoring at T = (283.15, 288.15, 293.15, 298.15, 303.15, 308.15, 313.15, 318.15 and 323.15) K in twelve pure solvents, including water, benzene (Ph), di-Me sulfate (DMS), methylbenzene (PhMe), THF (THF), methanol (MeOH), ethanol (EtOH), 1,2-dichloroethane (DCE), nitromethane (NM), acetonitrile (ACN), Et acetate (EA) and formic acid (FA), at atm. pressure (P = 0.1 MPa). In the temperature range from 283.15 K to 323.15 K, the mole fraction solubility values of MTNP in water, Ph, DMS, PhMe, THF, MeOH, EtOH, DCE, NM, ACN, EA and FA were 0.000008-0.000072, 0.003495-0.025271, 0.002153-0.037197, 0.001602-0.012304, 0.002103-0.074525, 0.000318-0.001625, 0.003752-0.048205, 0.017836-0.047105, 0.008408-0.016783, 0.003579-0.012367, 0.004460-0.022006 and 0.220917-0.443206. As revealed from the exptl. results, the solubility of MTNP in twelve pure solvents increased with the increase in the temperature The solubility behaviors of MTNP in investigated solvents were analyzed with the Hansen solubility parameter. The Kamlet-Taft parameters were calculated to delve into the solvent effect. Subsequently, the measured solubility data was correlated with five thermodn. models, i.e., the modified Apelblat equation, λh equation, NRTL model, Wilson model and Two-Suffix Margules model. Overall, the NRTL model provided the most satisfactory fitting results. As revealed from the results, the min. average values of relative mean deviation (10⁴ARD) and root-mean square deviation (10⁴RMSD) were determined with the NRTL model that achieved the values of 2.06 and 1.49. Furthermore, the dissolution thermodn. parameters, including mixing enthalpy (ΔmixH), mixing entropy (ΔmixS) and mixing Gibbs energy (ΔmixG) were calculated according to the Wilson model, and the relative contributions of enthalpy %ζH and entropy %ζS were also calculated It can be seen that the dissolution of MTNP in a given solvent is spontaneous and entropy driven.

Journal of Molecular Liquids published new progress about 930-36-9. 930-36-9 belongs to pyrazoles-derivatives, auxiliary class Pyrazole, name is 1-Methylpyrazole, and the molecular formula is C7H11Br, Synthetic Route of 930-36-9.

Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics

Kim, Hyun Tae published the artcileLigand-controlled Regiodivergent C-H Alkenylation of Pyrazoles and its Application to the Synthesis of Indazoles, HPLC of Formula: 930-36-9, the publication is Angewandte Chemie, International Edition (2017), 56(51), 16262-16266, database is CAplus and MEDLINE.

Regioselective C4-, C5-, and di-alkenylations of pyrazoles were achieved. An electrophilic Pd catalyst generated by trifluoroacetic acid (TFA) and 4,5-diazafluoren-9-one (DAF) leads to C4-alkenylation, whereas KOAc and mono-protected amino acid (MPAA) ligand Ac-Val-OH give C5-alkenylation. A combination of palladium acetate, silver carbonate, and pivalic acid affords dialkenylation products. Annulation through sequential alkenylation, thermal 6π-electrocyclization, and oxidation gives functionalized indazoles. This comprehensive strategy greatly expands the range of readily accessible pyrazole and indazole derivatives, enabling useful regiodivergent C-H functionalization of pyrazoles and other heteroaromatic systems.

Angewandte Chemie, International Edition published new progress about 930-36-9. 930-36-9 belongs to pyrazoles-derivatives, auxiliary class Pyrazole, name is 1-Methylpyrazole, and the molecular formula is C4H6N2, HPLC of Formula: 930-36-9.

Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics

Chen, Yantao published the artcileSynthesis of Enantiomerically Pure 2-Heteroaromatic-Substituted 1,2-Amino Alcohols from Chiral tert-Butanesulfinyl Aldimines, Name: 1-Methylpyrazole, the publication is Synthesis (2015), 47(5), 679-691, database is CAplus.

Nine R/S pairs of 2-heteroaromatic-substituted 1,2-amino alcs. were synthesized through 1,2-nucleophilic addition between chiral N-(tert-butylsulfinyl)imines and heteroaromatic carbanions. In most cases, the RS-isomer of N-(tert-butylsulfinyl)imines afforded the (R)-amino alc. from deprotection of the major diastereomer, and (S/S)-imines afforded the (S)-product. In general, this procedure allows for the preparation of a variety of enantiomeric pairs of 2-heteroaromatic-substituted 1,2-amino alcs. on a practical scale (>10 g) in two steps in good yields. Aldimines were prepared from [S(S)]-2-methyl-2-propanesulfinamide and [S(R)]-2-methyl-2-propanesulfinamide. The synthesis of the target compounds was achieved by a reaction of , [S(S)]-N-[2-[[(1,1-dimethylethyl)dimethylsilyl]oxy]ethylidene]-2-methyl-2-propanesulfinamide (chiral auxiliary, tert-butanesulfinyl aldimine) and [S(R)]-N-[2-[[(1,1-dimethylethyl)dimethylsilyl]oxy]ethylidene]-2-methyl-2-propanesulfinamide (chiral auxiliary) with 5-bromo-2-methoxypyridine, 3-bromo-1-methyl-1H-pyrazole, 1-methyl-1H-imidazole, 2-chloro-1-methyl-1H-imidazole, 4-bromo-2-methoxypyridine, pyrazine, 1-methyl-1H-pyrazole, 1,4-dimethyl-1H-pyrazole, 1-methyl-1H-1,2,4-triazole. Key intermediates included [S(S)]-N-[(1S)-2-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-1-(1-methyl-1H-1,2,4-triazol-5-yl)ethyl]-2-methyl-2-propanesulfinamide and a diastereomer, [S(R)]-N-[(1S)-2-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-1-(1-methyl-1H-1,2,4-triazol-5-yl)ethyl]-2-methyl-2-propanesulfinamide. Chiral β-(amino)alkanol derivatives included β-amino-1-methyl-1H-1,2,4-triazole-5-ethanol and (βS)-β-amino-6-methoxy-3-pyridineethanol, (βR)-β-amino-1-methyl-1H-imidazole-1-ethanol, (βS)-β-amino-1-pyrazineethanol, (βR)-β-amino-1-pyrazineethanol.

Synthesis published new progress about 930-36-9. 930-36-9 belongs to pyrazoles-derivatives, auxiliary class Pyrazole, name is 1-Methylpyrazole, and the molecular formula is C4H6N2, Name: 1-Methylpyrazole.

Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics

Vernier, William F. published the artcileRegioselective palladium-catalyzed C-H arylation of 4-alkoxy and 4-thioalkyl pyrazoles, Computed Properties of 930-36-9, the publication is Tetrahedron Letters (2017), 58(49), 4587-4590, database is CAplus.

Alkoxy- and alkylthiopyrazoles such as 4-benzyloxy-1-methylpyrazole underwent regioselective arylation with aryl and heteroaryl bromides in the presence of Pd(OAc)₂ and either SPhos or QPhos in 1,4-dioxane at 70-90 °C to yield arylpyrazoles such as I and an arylimidazole in 19-88% yields; 1-methylpyrazole, 4-chloro-1-methylpyrazole, 1-phenyl-4-pyrazolecarboxaldehyde, and 1-methylimidazole also underwent arylation under similar conditions but required higher temperatures Bromoaralkyl pyrazolyl ethers and thioethers such as 4-(2-bromobenzyloxy)-1-methylpyrazole underwent intramol. arylation to yield fused pyrazoles such as pyrazoloisobenzopyran II in 34-93% yields.

Tetrahedron Letters published new progress about 930-36-9. 930-36-9 belongs to pyrazoles-derivatives, auxiliary class Pyrazole, name is 1-Methylpyrazole, and the molecular formula is C15H12O8, Computed Properties of 930-36-9.

Referemce:
https://en.wikipedia.org/wiki/Pyrazole,
Pyrazoles – an overview | ScienceDirect Topics