Pyridine-derivatives

Application of 116632-24-7, 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. 116632-24-7, name is 2-Amino-4,6-dichloropyridine. A new synthetic method of this compound is introduced below.

Reference Example 4 6-chloro-4-fluoropyridin-2-amine (0375) 7.46 g (49.11 mmol) of cesium fluoride were added at room temperature to a mixed solution of 2.00 g (12.27 mmol) of 4,6-dichloropyridin-2-amine and 30 ml dimethyl sulfoxide. After completion of the addition, said reaction mixture liquid was stirred for 12 hours at 170 C. After completion of the stirring, the reaction was stopped by addition of 100 ml of water, and said reaction liquid was extracted with ethyl acetate (2×300 ml). The organic layer obtained was dried with anhydrous sodium sulfate, and the solvent distilled off under reduced pressure. The residue obtained was purified by silica gel chromatography (n-hexane:ethyl acetate=9:1 to 5:5), and 95 mg of the desired compound were obtained as a white solid.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,116632-24-7, its application will become more common.

Reference:
Patent; SYNGENTA PARTICIPATIONS AG; NAKAYA, Yoshihiko; MASUZAWA, Yoshihide; FURUHASHI, Takamasa; MIYAKADO, Yuuki; HOTTA, Hiroyasu; INABA, Masamitsu; (76 pag.)US2016/221998; (2016); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of 104508-24-9 ,Some common heterocyclic compound, 104508-24-9, molecular formula is C7H5BrN2, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc., below Introduce a new synthetic route.

Racemic 2,2-difluoro-8-(1-hydroxyethyl)-2H-1 ,4-benzoxazin-3(4H)-one (50 mg; may be prepared as described in intermediate 4), 6-(bromomethyl)-2-pyridinecarbonitrile (64.5 mg, may be prepared as described in intermediate 39), potassium carbonate (60.3 mg, 0.436 mmol) and potassium iodide (0.362 mg, 2.182 mumol) were dissolved in DMF (2000 mul) in a 10 ml. round-bottomed flask open to the atmosphere and stirred at room temperature overnight. The reaction mixture was evaporated to dryness, redissolved in EtOAc (30ml) and treated with saturated aqueous sodium bicarbonate (30ml). The aqueous layer was extracted with EtOAc (2x30ml) and the organic layers were combined, washed with brine (30ml), dried over magnesium sulfate, fiitered and evaporated to dryness to give the crude product (94mg) as a pale yellow oil. The crude product was purified on a 25+S Biotage silica cartridge, eluting with a 0 to 70 % mixture of EtOAc in hexane to give a colourless oil (67 mg). 53 mg of this racemic mixture was resolved using a Chiralpak IA column eluting with heptane: ethanol (80:20) v/v pump- mixed. Using these conditions the faster-running enantiomer (18 mg, Compound 61 or 62) and the slower-running enantiomer (17 mg, Compound 61 or 62) were obtained in >98% enantiomeric excess as white solids. 1H NMR (CD3OD) delta: 1.45 (3H, d), 5.24 (1 H, q), 5.43 (2H, s), 7.10 (1 H, dd), 7.20 (1 H, t), 7.39, (1 H, d), 7.65 (1 H, d), 7.78 (1 H, d), 7.98 (1 H, t). m/z [M+H]+: 346.2. Retention time 0.91 min (LC/MS method 3).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,104508-24-9, its application will become more common.

Reference:
Patent; GLAXO GROUP LIMITED; BLUNT, Richard; EATHERTON, Andrew John; GARZYA, Vincenzo; HEALY, Mark Patrick; MYATT, James; PORTER, Roderick Alan; WO2011/12622; (2011); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 15128-82-2, 2-Nitropyridin-3-ol, 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, Computed Properties of C5H4N2O3, blongs to pyridine-derivatives compound. Computed Properties of C5H4N2O3

Preparation 3; Preparation of 3-Oxo-3,4-dihydro-2/-/-pyridoF3,2-d1f 1 ,41oxazine-6-carboxaldehvde; (a) 2-Bromo-5-hydroxy-6-nitropyridine; 3-Hydroxy-2-nitropyridine (20 g, 0.143 mole) was dissolved in methanol (400 ml_) and a solution of 25% sodium methoxide in methanol (33 ml_, 0.13 mole) was added at – room temperature. The mixture was stirred for 30 min, then was cooled to 0 0C, and bromine (7.2 ml_, 0.14 mole) was added slowly. The reaction was stirred at 0 0C for 30 min, then was quenched with glacial AcOH (2.5 ml_). The solvent was removed in vacuo to afford material (30 g, 96%), which was used without further purification: MS (ES) m/z219.0 (M + H)+.

The synthetic route of 15128-82-2 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; GLAXO GROUP LIMITED; WO2006/81179; (2006); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of 15128-82-2, 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. 15128-82-2, name is 2-Nitropyridin-3-ol, molecular formula is C5H4N2O3, 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.

3-Hydroxy-2-nitropyridine (175 mg, 1.21 mmol) and triphenylphosphine (440 mg, 1.65 mmol) were added sequentially to a stirred solution of (1S)-1-(2,6-dichloro-3-fluorophenyl)ethanol (229.8 mg, 1.1 mmol) in THF (10 mL) under a nitrogen atmosphere. The reaction mixture was maintained at room temperature for 1 h and then diisopropyl azo-dicarboxylate (0.34 mL, i.65 mmol) was added at 0C. The mixture was stirred for an additional 12 h. The reaction mixture was evaporated under vacuum to give an oil. The residue was purified by flash chromatography (eluting with 20->25% EtOAc in hexanes) to give the title compound as a white solid (321.5 mg; 0.97 mmol; 88.3% yield); MS (APCI) (M+H)+ 331; SFC-MS: 99.5%ee. 1H NMR (400 MHz, chloroform-D) 8 ppm 1.85 (d, J=6.6 Hz, 3 H) 6.10 (q, J=6.6 Hz, 1 H) 7.04 -7.13 (m, 1 H) 7.21 (dd, J=8.5, 1.14 Hz, 1 H) 7.30 (dd, ^=9.0, 4.9 Hz, 1 H) 7.37 (dd, J=Q.6, 4.6 Hz, 1 H) 8.04 (dd, Jt4.6, 1.3 Hz, 1 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 15128-82-2, 2-Nitropyridin-3-ol.

Reference:
Patent; PFIZER INC.; WO2006/21886; (2006); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 849937-96-8, 5-Bromo-2,4-dichloropyridine, 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, COA of Formula: C5H2BrCl2N, blongs to pyridine-derivatives compound. COA of Formula: C5H2BrCl2N

Example 123 N-[l-cyclopropyl-2-(5-methyl-l,2,4-oxadiazol-3-yl)propan-2-yl]-5-(3-hydroxyoxetan- 3-yl)-4-(2,2,2-trifluoroethoxy)pyridine-2-carboxamide 3-(4,6-dichloro-3-pyridyl)oxetan-3-ol To a solution of 5-bromo-2,4-dichloropyridine (CAN 849937-96-8, 15 g, 66.1 mmol) in dry THF (300 ml) cooled down to -15C under an argon atmosphere was added isopropyl magnesium chloride, lithium chloride complex (53.4 ml, 69.4 mmol) and the mixture was stirred at -15C for 1 hour. Then oxetan-3-one (5.24 g, 72.7 mmol) was added neat to the reaction mixture cooled at -15C, reaction mixture was stirred and let to warm up to room temperature overnight. Reaction was quenched by addition of water and stirred for 5 minutes. Reaction was diluted with ethyl acetate and was transfered into a separatory funnel. The organic phase was extracted with a saturated aqueous solution of ammonium chloride and the organic phase was collected. The aqueous phase was back-extracted with ethyl acetate. The combined organic phases were dried over sodium sulfate and evaporated down to dryness. The crude material was purified by flash chromatography on silica eluting with a heptane/ethyl acetate gradient to yield the title compound (10.5mg, 72%). MS (ESI, m/z): 220.4 (M+H+)

At the same time, in my other blogs, there are other synthetic methods of this type of compound,849937-96-8, 5-Bromo-2,4-dichloropyridine, and friends who are interested can also refer to it.

Reference:
Patent; F. HOFFMANN-LA ROCHE AG; HOFFMANN-LA ROCHE INC.; GRETHER, Uwe; KIMBARA, Atsushi; NETTEKOVEN, Matthias; RICKLIN, Fabienne; ROEVER, Stephan; ROGERS-EVANS, Mark; ROMBACH, Didier; SCHULZ-GASCH, Tanja; WESTPHAL, Matthias; WO2014/86805; (2014); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Application of 128071-98-7, In the chemical reaction process,reaction time,type of solvent,can easily affect the result of the reaction, thereby determining the yield and properties of the reaction product.An updated downstream synthesis route of 128071-98-7 as follows.

Intermediate E-XI (4-Bromo-pyridin-2-vD-hvdrazine A flask was charged with a stir bar, 4-bromo-2-fluoro-pyridine (2.00 g), and hydrazine hydrate (5.5 mL). The resulting mixture was vigorously stirred at room temperature overnight. Then, 4 M aqueous NaOH solution (5 mL) and water (10 mL) were added and the mixture was vigorously stirred for another 10 min. The precipitate was separated by filtration, washed with water, and dried at 50 0C. The title compound was isolated as a colorless solid. Yield: 1.57 g (74% of theory).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,128071-98-7, its application will become more common.

Reference:
Patent; BOEHRINGER INGELHEIM INTERNATIONAL GMBH; ECKHARDT, Matthias; HIMMELSBACH, Frank; WO2010/89303; (2010); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

With the rapid development and complex challenges of chemical substances, the synthesis of new drugs is usually one of the most effective ways to increase yield.103999-77-5, name is 2,5-Dichloro-3-fluoropyridine, molecular formula is C5H2Cl2FN, molecular weight is 165.98, as common compound, the synthetic route is as follows.Product Details of 103999-77-5

(c) 5-chloro-2,3-difluoropyridine A suspension of 64.6 g (1.1 mol) of potassium fluoride and 11.25 g (0.075 mol) of cesium-fluoride in 240 ml of sulfolane (1,1-dioxo-tetrahydrothiophene) is heated to 140 C. By reducing the pressure 50 ml of sulfolane are distilled off. To the suspension a solution of 61.4 g (0.37 mol) of 2,5-dichloro-3-fluoropyridine in 20 ml of sulfolane is added. The reaction-mixture is then stirred for 35 hours at a temperature of 140, cooled and poured into ice/water. The organic material is extracted with ether. The ethereal layer is washed with water dried over magnesium sulfate, filtered and evaporated to yield 48.7 g of a colourless oil (88% of the theory) which boils at 65-66 at 133 mbar.

At the same time, in my other blogs, there are other synthetic methods of this type of compound,103999-77-5, 2,5-Dichloro-3-fluoropyridine, and friends who are interested can also refer to it.

Reference:
Patent; Ciba Geigy Corporation; US4713109; (1987); A;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of 59237-53-5, Adding some certain compound to certain chemical reactions, such as: 59237-53-5, name is Methyl 6-chloro-5-nitronicotinate,molecular formula is C7H5ClN2O4, 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 59237-53-5.

A suspension of methyl beta-chloro-S-nitronicotinate (1 eq), iron powder (5.2 eq), and NH4Cl3 (5.3 eq) in MeOH was heated at 75°C for 2 h. The mixture was passed through a pad of celite while hot and concentrated in vacuo to give methyl 5- amino-6-chloronicotinate (56 percent yield)

According to the analysis of related databases, 59237-53-5, the application of this compound in the production field has become more and more popular.

Reference:
Patent; SIRTRIS PHARMACEUTICALS, INC.; OALMANN, Christopher; DISCH, Jeremy, S.; NG, Pui, Yee; PERNI, Robert, B.; WO2010/71853; (2010); 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. 889939-26-8, name is 4-Bromo-2-iodo-1-(phenylsulfonyl)-1H-pyrrolo[2,3-b]pyridine, the common compound, a new synthetic route is introduced below. HPLC of Formula: C13H8BrIN2O2S

A sealed tube containing a suspension of 5-(2~iodo-1-(phenylsulfonyl)- 1 H-pyrrolo[2,3-b]pyridn-4-yl)-2-((tetrahydrQ-2H-pyran-4-yl)oxy)benzonitrile (100 mg, 0.171 mmol) and Pd(PPh?)4 (9 mg, 0.008 mmol) in a degassed mixture of dioxane/H20 (1.5mL, 4/1 ), was preheated at 85 C for 5 rnin. Next, K2C03 (59 mg, 0.43 mmol) and 2- (3,6-dhydro-2H-pyran-4-yl)-4,4,5,5-tetramethyl-1 ,3,2-dioxaborolane (54 mg, 0.257 mmol), were added to the mixture and the reaction was additionally heated at 100 C in the sealed tube for 15 hrs. Afterwards, the crude material was allowed to reach room temperature. It was concentrated to dryness; the residue was triturated with EtOH and filtered through a short pad of Celite, washing the solids with CH2CI2. The filtrate was concentrated to dryness. The residue was purified by flash column chromatography on silica gel to afford 5-(2-(3,6-dihydro-2H-pyran-4-yl)-1- (phenylsulfonyl)-l H-pyrroio [2,3-b]pyridin-4-yl)-2-((tetrahydro-2H-pyran-4- yl)oxy)benzonitrile. LCMS-ESI+ (m/z): [M+H]+ calcd for C30H27N3O5S: 542.2; found: 542.2

The synthetic route of 889939-26-8 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; GILEAD SCIENCES, INC.; DU, Zhimin; GUERRERO, Juan, Arnaldo; KAPLAN, Joshua, Aaron; KNOX, JR., John Edward; NADUTHAMBI, Devan; PHILLIPS, Barton, W.; VENKATARAMANI, Chandrasekar; WANG, Peiyuan; WATKINS, William, J.; ZABLOCKI, Jeff; WO2015/187684; (2015); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthetic Route of 72716-87-1 , The common heterocyclic compound, 72716-87-1, name is 2-Methoxyisonicotinaldehyde, molecular formula is C7H7NO2, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc., below Introduce a new synthetic route.

General procedure: A solution of 2,3-diamino-1,4-naphthoquinone (1.0 mmol),appropriate aromatic aldehyde (1.0 mmol) with sodium pyrosulfitein DMF was stirred at 120 C overnight. On completion of the reactionmonitored by TLC, the solvent was evaporated and the residuewas purified by silica gel chromatography by DCM/MeOHsystem to afford the final product. If necessary, the crude productcould be recrystallized in methanol or DMSO to afford pure sample.4.1.5.1. 2-(2-Chlorophenyl)-1H-naphtho[2,3-d]imidazole-4,9-dione(T1). Pale yellow solid; yield 80%;

The synthetic route of 72716-87-1 has been constantly updated, and we look forward to future research findings.

Reference:
Article; Pan, Liangkun; Zheng, Qiang; Chen, Yu; Yang, Rui; Yang, Yanyan; Li, Zhongjun; Meng, Xiangbao; European Journal of Medicinal Chemistry; vol. 157; (2018); p. 423 – 436;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem