Pyridine-derivatives

In the next few decades, the world population will flourish. As the population grows rapidly and people all over the world use more and more resources, all industries must consider their environmental impact. 6332-56-5, name is 3-Nitropyridin-2(1H)-one, the common compound, a new synthetic route is introduced below. Formula: C5H4N2O3

a. 5-bromo-3-nitro-pyridine-2-ol-hydrobromide 3.6 ml of bromine are added dropwise to a suspension of 10.0 g (0.071 mol) of 2-hydroxy-3-nitro-pyridine in 25 ml of carbon tetrachloride whilst cooling with ice. The reaction mixture is refluxed for 2 hours. The solvent is distilled off in vacuo, the crystalline product is suction filtered and recrystallized from water. Yield: 7.5 g (35.1% of theory).

The synthetic route of 6332-56-5 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Boehringer Ingelheim Pharma KG; US6200976; (2001); B1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Application of 84249-14-9, As we all know, there are many different methods for the synthesis of a compound, and people can choose the synthesis method that suits their own laboratory according to the actual situation. 84249-14-9, name is 2-Amino-4-bromopyridine, molecular formula is C5H5BrN2, The compound is widely used in many fields, so it is necessary to find a new synthetic route. The downstream synthesis method of this compound is introduced below.

A solution of 4-bromopyridin-2-amine (5.00 g, 28.9 mmol) in dry THF (100 mL) was treated with LiHMDS (1 M, 57.8 mL) at -5 OC and the solution was stirred at -5 OC for 10 minutes. Then (Boc)2O (6.31 g, 28.9 mmol) was added and the mixture was allowed to warm to rt and stirred for 1 h. On completion, the reaction mixture was quenched with saturated ammonium chloride solution (20 mL) and extracted with EtOAc (3×100 mL). The combined organic layers were washed with brine (20 mL), dried with Na2SO4, filtered and concentrated in vacuo. The residue was purified by silica gel column chromatography to give the title compound (6.50 g, 82% yield) as a white solid. 1H NMR (400 MHz, CDCl3) delta=8.92 (s, 1H), 8.27 (d, J=0.8 Hz, 1H), 8.13 (d, J=5.2 Hz, 1H), 7.12 (dd, J=1.6, 5.2 Hz, 1H), 1.55 (s, 9H).

According to the analysis of related databases, 84249-14-9, the application of this compound in the production field has become more and more popular.

Reference:
Patent; Kymera Therapeutics, Inc.; Mainolfi, Nello; Ji, Nan; Kluge, Arthur F.; Weiss, Matthew M.; Zhang, Yi; (1443 pag.)US2019/192668; (2019); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of 633328-33-3, Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. Generally, it requires fewer steps,and cheap raw materials. 633328-33-3, name is 3-Bromo-1H-pyrazolo[4,3-b]pyridine. A new synthetic method of this compound is introduced below.

To a stirred solution of 3-bromo-1 H-pyrazolo[4,3-b]pyridine (200 mg, 1.01 mmol) in DMF (5 mL), 3,4-dihydro- 2H-pyran (127 mg, 1.51 mmol) and a catalytic amount of pTSA were added at rt. The resulting solution was stirred at 85 C for 24h. The reaction was cooled to rt, diluted with water and extracted with EtOAc. The organic layer was washed with water and brine solution, dried over anhydrous Na2SC>4, and filtered. The resulting solution was concentrated under reduced pressure to get crude a residue that was purified by flash columnchromatography to afford the title compound (150 mg, 52.8 %).LC-MS (method 1): Rt = 2.24 min; m/z = 282.30 (M+H+).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,633328-33-3, its application will become more common.

Reference:
Patent; ORYZON GENOMICS, S.A.; CARCELLER GONZALEZ, Elena; ORTEGA MUNOZ, Alberto; SALAS SOLANA, Jorge; (103 pag.)WO2019/110663; (2019); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthetic Route of 6271-78-9, The major producers of chemicals have been the Europe, Japan and China. Due to the growing call for a cleaner, greener environment, people will have to find innovative ways to maintain their relevance. Here is a compound 6271-78-9, name is 6-Chloropyridine-3-carboxamide. This compound has unique chemical properties. The synthetic route is as follows.

EXAMPLE 23 4-Oxo-2-propyl-4H-pyrido[1,2-a]thieno[2,3-d]pyrimidine-7-carboxamide From 4.6 g (0.0029 mol) of 6-chloro-3-pyridinecarboxamide (Aldrich Chemical Company) and 8.6 g (0.040 mol) of 2-amino-5-propyl-3-thiophenecarboxylic acid, ethyl ester, following the procedure of Example 22 there is obtained 2.6 g of 4-oxo-2-propyl-4H-pyrido[1,2-a]thieno[2,3-d]pyrimidine-7-carboxamide; mp 260-264 C. after recrystallization from pyridine.

According to the analysis of related databases, 6271-78-9, the application of this compound in the production field has become more and more popular.

Reference:
Patent; Warner-Lambert Company; US4230707; (1980); A;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Related Products of 1003-68-5, The major producers of chemicals have been the Europe, Japan and China. Due to the growing call for a cleaner, greener environment, people will have to find innovative ways to maintain their relevance. Here is a compound 1003-68-5, name is 5-Methylpyridin-2(1H)-one. This compound has unique chemical properties. The synthetic route is as follows.

EXAMPLE 21 1-(2’Imidazolyl)-5-methyl-2-(1H)-pyridone Following essentially the general procedure outlined in Example 1, the reaction of 5-methyl-2-(1H)-pyridone with 2-chloroimidazole affords 1-(2′-imidazolyl)-5-methyl-2-(1H)-pyridone in 82% yield.

According to the analysis of related databases, 1003-68-5, the application of this compound in the production field has become more and more popular.

Reference:
Patent; Affiliated Medical Research, Inc.; US3974281; (1976); A;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In the next few decades, the world population will flourish. As the population grows rapidly and people all over the world use more and more resources, all industries must consider their environmental impact. 7598-35-8, name is 2-Bromopyridin-4-amine, the common compound, a new synthetic route is introduced below. COA of Formula: C5H5BrN2

A 50 mL single necked round bottom flask equipped with reflux condenser, under nitrogen atmosphere, was charged with 2-bromopyridin-4-amine (17) (5.0 g, 28.9 mmol, 1.0 equiv), NaOAc.3H2O (5.90 g, 43.3 mmol, 1.5 equiv), ICl (5.16 g, 31.8 mmol, 1.1 equiv) and glacial acetic acid (19.3 mL) and stirred, at 70 oC, for 16 hours. The reaction mixture was cooled and transferred to a separating funnel and was carefully quenched with portionwise addition of solid powdered NaHCO3 (31.1 g), water (50 mL) and EtOAc (50 mL). The layers were then separated and the aqueous layer was extracted with EtOAc (3 x 50 mL). The combined organic layers were dried over MgSO4 and the volatiles were evaporated. The residue was purified by portionwise flash column chromatography over silica using n-hexane/ EtOAc (99:1 to 50:50) mixtures as eluent to give 2-bromo-5-iodopyridin-4-amine 18 as a light brown solid (3.70 g, 43%). A sample of which had 1H NMR spectral data and low resolution GC/MS (EI) mass spectral data identical to those in the literature

The synthetic route of 7598-35-8 has been constantly updated, and we look forward to future research findings.

Reference:
Article; Balfour, Michael N.; Zukerman-Schpector, Julio; Rodriguez, Maria Jose Davila; Reis, Joel Savi; Esteves, Carlos Henrique A.; Stefani, Helio A.; Synthetic Communications; vol. 49; 3; (2019); p. 351 – 358;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 38185-56-7, 5-Bromo-3-chloro-2-fluoropyridine, can increase the reaction rate and produce products with better performance than those obtained under traditional synthetic methods. Here is a downstream synthesis route of the compound, Recommanded Product: 38185-56-7, blongs to pyridine-derivatives compound. Recommanded Product: 38185-56-7

STEP-1 : 5 -BROMO-3 -CHLORO-2-ISOBUTOXYP YRIDINE[00214] To a solution of 5-bromo-3-chloro-2-fluoropyridine (5.0 g, 23.7 mmol, LLB Chem) and 2-methylpropan-l-ol (5.28 g, 71.3 mmol, Spectrochem) in DMSO (100 mL) was added CS2CO3(23.0 g, 71.3 mmol, GLR) and the reaction was heated at 90 C for 3 h. The reaction mixture was allowed to cool to room temperature, water (500 mL) was added and the aqueous layer was extracted with diethyl ether (2 x 500 mL). The combined organic extract was dried over sodium sulfate and concentrated under reduced pressure to obtain the crude material which was purified by column chromatography (silica gel 100-200 mesh and 0-5% ethyl acetate in hexanes) to obtain compound-3 (5.0 g, 86%) as colorless oil. TLC solvent system: 10% ethyl acetate in hexanes, product’s Rf: 0.8. MS (ESI, positive ion): No ionization.1H NMR (400 MHz, CDC13) delta 8.06 (d, J= 2.2 Hz, 1H), 7.74 (d, J= 2.2 Hz, 1H), 4.11 (d, J= 6.7 Hz, 2H), 2.12 (dp, J= 13.4, 6.7 Hz, 1H), 1.03 (d, J= 6.7 Hz, 6H).

At the same time, in my other blogs, there are other synthetic methods of this type of compound,38185-56-7, 5-Bromo-3-chloro-2-fluoropyridine, and friends who are interested can also refer to it.

Reference:
Patent; AMGEN INC.; BREGMAN, Howard; CHAKKA, Nagasree; DIMAURO, Erin F.; GAO, Hua; GUNAYDIN, Hakan; HUANG, Hongbing; OLIVIERI, Philip; SCHENKEL, Laurie; WEISS, Matthew; WO2015/51043; (2015); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The major producers of chemicals have been the Europe, Japan and China. Due to the growing call for a cleaner, greener environment, people will have to find innovative ways to maintain their relevance. Here is a compound 65-22-5, name is 3-Hydroxy-5-(hydroxymethyl)-2-methylisonicotinaldehyde hydrochloride. This compound has unique chemical properties. The synthetic route is as follows. Computed Properties of C8H10ClNO3

General procedure: In a round bottom flask, pyridoxal hydrochloride (0.201g; 1.0mmol) was added to methanol (15mL) and the resulting suspension was subjected to magnetic stirring at room temperature until complete dissolution of the pyridoxal molecule. Then, the corresponding aniline (0.120g of 2-fluoroaniline; 0.130g of 2-chloroaniline, 0.170g of 2-bromoaniline or 0.220g of 2-iodoaniline; 1.0mmol for each) dissolved in methanol (5 mL) was added. The resulting mixture was kept under magnetic stirring at reflux temperature for 2.0h. After this period, the flask contents were cooled to room temperature and the solvent evaporated. The resulting solid was washed with small portions of ice water and diethyl ether and dried in a desiccator with CaCl2. For the synthesis of the ligand containing aniline, the same conditions were used, but without potassium hydroxide (0.093g of aniline was added to 15mL of methanol and 1mmol of pyridoxal hydrochloride; 0.201g). Properties – orange crystals, yield 85%. Melting point: 207C. Anal.Calc. for [C14H13BrN2O2] C, 47.02; H, 3.95; N, 7.83. Found: C, 46.93; H, 3.90; N, 7.79%. IR (KBr pellets, cm-1): 3209 [w, nu(O-H)]; 1627 [m, nu(C=N)]; 1387 [m, nu(C-N)], 1257 [s, nu(C-O)phenol], 1033 [s, nu(C-O)alcohols], 694 [m, nu(C-Br)alcohols] and 620 [s, nu(O-H)alcohols] (w=weak; m=medium; s=strong). 1H NMR (ppm, DMSO-d6): delta 2.46 (s, 3H, CH3); 4.80 (s, 2H, CH2); 7.32-7.81 (m, 4H, Ar); 8.03 (s, 1H, Py) and 9.21 (s, 1H, CHimine)

With the rapid development of chemical substances, we look forward to future research findings about 65-22-5.

Reference:
Article; Pereira, Mateus Brum; Fontana, Liniquer Andre; Siqueira, Josieli Demetrio; Auras, Bruna L.; da Silva, Marcos P.; Neves, Ademir; Gabriel, Philipe; Terenzi, Hernan; Iglesias, Bernardo Almeida; Back, Davi Fernando; Inorganica Chimica Acta; vol. 469; (2018); p. 561 – 575;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Application of 851386-35-1, The major producers of chemicals have been the Europe, Japan and China. Due to the growing call for a cleaner, greener environment, people will have to find innovative ways to maintain their relevance. Here is a compound 851386-35-1, name is 2,3-Difluoro-5-iodopyridine. This compound has unique chemical properties. The synthetic route is as follows.

Step 1: 1-(3-Fluoro-5-iodo-pyridin-2-ylamino)-2-methyl-propan-2-ol 2,3-Difluoro-5-iodopyridine (500 mg, 2.07 mmol) was dissolved in NMP (500 muL) and pyridine (201 mul, 2.49 mmol, 1.2 equiv.) and 1-amino-2-methylpropan-2-ol (555 mg, 6.22 mmol, 3 equiv.) were added at room temperature. The mixture was stirred for 16 hours at 100° C. The reaction mixture was cooled and extracted with saturated NaHCO3 solution and two times with a small volume of dichloromethane. The crude product was purified by flash chromatography by directly loading the dichloromethane layers onto a silica gel column and eluting with an ethyl acetate:heptane gradient 0:100 to 100:0. The desired 1-(3-fluoro-5-iodopyridin-2-ylamino)-2-methylpropan-2-ol (590 mg, 1.9 mmol, 91.7percent yield) was obtained as a colorless oil, MS: m/e=311.0 (M+H+).

While traditionally a conservative industry, chemical producers will need to modernize their PR strategies to stay relevant.we look forward to future research findings about 851386-35-1, 2,3-Difluoro-5-iodopyridine.

Reference:
Patent; Green, Luke; Guba, Wolfgang; Jaeschke, Georg; Jolidon, Synese; Lindemann, Lothar; Ricci, Antonio; Rueher, Daniel; Stadler, Heinz; Vieira, Eric; US2011/251169; (2011); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In the next few decades, the world population will flourish. As the population grows rapidly and people all over the world use more and more resources, all industries must consider their environmental impact. 15855-06-8, name is 2-Chloro-6-methoxypyridine-4-carboxylic Acid, the common compound, a new synthetic route is introduced below. HPLC of Formula: C7H6ClNO3

b) To a suspension of 2-chloro-6-methoxy-isonicotinic acid (244 g, 1.30 mol) in methanol (2.5 L), H2SO4 (20 mL) is added. The mixture is stirred at reflux for 24 h before it is cooled to 0 C. The solid material is collected, washed with methanol (200 mL) and water (500 mL) and dried under HV to give 2-chloro-6-methoxy-isonicotinic acid methyl ester (165 g) as a white solid; LC-MS: tR=0.94 min, [M+1]+=201.89.

The synthetic route of 15855-06-8 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Bolli, Martin; Lescop, Cyrille; Mathys, Boris; Morrison, Keith; Mueller, Claus; Nayler, Oliver; Steiner, Beat; US2012/108638; (2012); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem