Month: April 2022

Reference of 1186608-73-0, 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.1186608-73-0, name is 3-Methyl-1H-pyrazolo[3,4-b]pyridin-5-amine, molecular formula is C7H8N4, molecular weight is 148.17, as common compound, the synthetic route is as follows.

EXAMPLE 16: Tetra-butyl 3-(3-methyl-lH-pyrazolo r3.4-blpyridine-5- ylamino)piperidine- 1 -carboxylateTo a stirred solution of 3-Methyl-lH-pyrazole[3,4-¾]pyridn-5-amine (500mg, 3.3mmol) in EtOH (50ml), tert-butyl 3 -oxopiperidine-1 -carboxylate (74mg, l . lmmol) was added and reaction mass was cooled to 0C. Acetic acid (0.018ml, 0.33mmol) was added after which reaction mixture was stirred for 20 minutes. Sodium cyanoborohydride (42mg, 0.66mmol) was added and stirred for 12h at RT. TLC showed absence of SM. The reaction mixture was quenched with brine solution and extracted with ethyl acetate. The extract was washed with water and concentrated. Organic layer was dried over anhydrous sodium sulphate, dried and concentrated. Product was purified by flash column chromatography over 230-400 mesh silica gel using 2-5% MeOH/ DCM as eluent to afford the desired product 20, 500mg (Yield: 45%) as white solid. The product was confirmed by 1HNMR and MS spectrum analysis. 1H NMR (400 MHz, CDC13) delta: 8.13 (s, 1H), 7.19 (s, 1H), 3.95 (m, 1H), 3.25 (m, 1H), 3.43 (m, 1H), 3-3.25 (m, 2H), 2.52 (s, 3H), 2.15 (m. 1H), 1.78 (m, 1H), 1.6 (m, 2H), 1.49 (s, 9H); Ms- 331 (M-56), LCMS- 97%.

Statistics shows that 1186608-73-0 is playing an increasingly important role. we look forward to future research findings about 3-Methyl-1H-pyrazolo[3,4-b]pyridin-5-amine.

Reference:
Patent; ARRIEN PHARMAEUTICALS LLC; VANKAYALAPATI, Hariprasad; APPALANENI, Rajendra, P.; REDDY, Y., Venkata Krishna; WO2012/135631; (2012); 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 197376-47-9, name is Ethyl 6-Chloropyridine-3-acetate. This compound has unique chemical properties. The synthetic route is as follows. Quality Control of Ethyl 6-Chloropyridine-3-acetate

Step 2 To a solution of ethyl 2-(6-chloropyridin-3-yl)acetate (1.1 g, 5.51 mmol) in dimethylformamide was added slowly sodium hydride (242 mg, 6.06 mmol) at 0 C., followed by iodomethane (821 mg, 5.79 mmol). The mixture was stirred at same degree for 1 hour, and then quenched with water. The resulting mixture was diluted with ethyl acetate and washed with water. The organic layer was dried over magnesium sulfate and concentrated under reduced pressure to afford crude which was purified by column chromatography to afford ethyl 2-(6-chloropyridin-3-yl)propanoate (790 mg, 67%).

With the rapid development of chemical substances, we look forward to future research findings about 197376-47-9.

Reference:
Patent; Gruenenthal GmbH; FRANK, Robert; BAHRENBERG, Gregor; CHRISTOPH, Thomas; LESCH, Bernhard; LEE, Jeewoo; US2013/29962; (2013); 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. 55849-30-4, name is 5-Bromo-2-ethoxypyridine, the common compound, a new synthetic route is introduced below. Safety of 5-Bromo-2-ethoxypyridine

General procedure: PdCl2(dppf), PdCl2(tbpf) and (A.caPhos)PdCl2. A mixture of the halogenated heterocycle (0.66 mmol) in anhydrous THF (13.2 mL) was degassed by bubbling argon for few minutes. Then, PdCl2(dppf) (27.0 mg, 0.033 mmol, 5.0 mol%), TMEDA (0.130 g, 1.12 mmol, 1.7 equiv) and finally NaBH4 (42.4 mg, 1.12 mmol, 1.7 equiv) were introduced in sequence. The mixture was stirred at room temperature under argon for the proper time and then worked up as described above.

The synthetic route of 55849-30-4 has been constantly updated, and we look forward to future research findings.

Reference:
Article; Chelucci, Giorgio; Figus, Susanna; Journal of Molecular Catalysis A: Chemical; vol. 393; (2014); p. 191 – 209;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of 1033810-70-6 , The common heterocyclic compound, 1033810-70-6, name is [1,2,4]Triazolo[1,5-a]pyridin-7-ol, molecular formula is C6H5N3O, 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.

Step F: Preparation of tert-butyl 4-([1,2,4]triazolo[1,5-a]pyridin-7-yloxy)-3-chloro-2-fluorobenzoate: A vial charged with tert-butyl 3-chloro-2,4-difluorobenzoate (0.210 g, 0.845 mmol), [1,2,4]triazolo[1,5-a]pyridin-7-ol (0.114 g, 0.845 mmol), cesium carbonate (0.413 g, 1.27 mmol), and DMF (1.7 ml). The reaction was heated to 80 C for 12 hours, then poured into ice water. The resulting solids were collected by filtration and purified by flash chromatography, eluting with gradient of 10% EtOAc/ Hexanes to 50% EtOAc/Hexanes to provide the desired product.

The synthetic route of 1033810-70-6 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Array Biopharma, Inc.; EP2090575; (2009); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 83766-88-5, 2-(tert-Butoxy)pyridine, 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, Quality Control of 2-(tert-Butoxy)pyridine, blongs to pyridine-derivatives compound. Quality Control of 2-(tert-Butoxy)pyridine

Carboxylic acid (0.2 g, 1.64 mmol), tert-butoxypyridine (0.33 g, 2.21 mmol) and boron trifluoride diethyl etherate (0.31 g, 2.21 mmol) in dry PhCH3 (2 mL) were added to a 20-ml vial. The reaction mixture was then allowed to stir at room temperature for 30 min before quenching with anhydrous NaHCO3. The reaction mixture was diluted with ethyl acetate (30 mL), then washed with water (20 mL), followed by brine (20 mL). The organic layer was dried over anhydrous sodium sulfate and carefully concentrated under reduced pressure. The resulting residue was then purified by flash column chromatography on silica gel with 0:4 to 1:4 dichloromethane/hexane as eluent to yield the desired product 5a as a colorless oil.

At the same time, in my other blogs, there are other synthetic methods of this type of compound,83766-88-5, 2-(tert-Butoxy)pyridine, and friends who are interested can also refer to it.

Reference:
Article; La, Minh Thanh; Kim, Hee-Kwon; Tetrahedron; vol. 74; 27; (2018); p. 3748 – 3754;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Related Products of 846036-96-2, 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.846036-96-2, name is (4-Amino-6-chloropyridin-3-yl)methanol, molecular formula is C6H7ClN2O, molecular weight is 158.59, as common compound, the synthetic route is as follows.

Manganese dioxide (230 g, 2648 mmol) was added to a solution of (4-amino-6- chloropyridin-3-yl)methanol (50 g, 265 mmol) in dichloromethane (3000 mL) at 0 C under nitrogen. The resulting reaction mixture was allowed to warm to room temperature and stirred for sixteen hours. On completion, the reaction mixture was filtered through a Celite pad and the residue was washed with dichloromethane and the filtrate was evaporated under reduced pressure. The solid was washed with pentane to afford 4-amino-6-chloronicotinaldehyde (41 g, 237 mmol, 89 % yield) as an off white solid. 1H NMR (400 MHz, CD3SOCD3) delta 6.73 (s, 1 H), 7.69-7.91 (m, 2 H), 8.43 (s, 1 H), 9.88 (s, 1 H); LC-MS (LC-ES) M+H = 157.

Statistics shows that 846036-96-2 is playing an increasingly important role. we look forward to future research findings about (4-Amino-6-chloropyridin-3-yl)methanol.

Reference:
Patent; GLAXOSMITHKLINE INTELLECTUAL PROPERTY DEVELOPMENT LIMITED; DEATON, Dave Norman; SHEARER, Barry George; YOUNGMAN, Mark Andrew; (214 pag.)WO2018/229629; (2018); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Application of 69045-78-9, 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 69045-78-9, name is 2-Chloro-5-(trichloromethyl)pyridine. This compound has unique chemical properties. The synthetic route is as follows.

Example 2 In a 119.5 cc autoclave equipped with a magnetic stirrer, 2-chloro-5-trichloromethylpyridine (11.5 g), ethanol (20 g), Raney nickel (1.15 g) and a 40% aqueous solution of methylamine (27.2 g) were charged. Hydrogen gas was introduced into the autoclave to a pressure of 10 Kg/cm2, and an internal temperature was raised to 45 C. At the same temperature, the hydrogen gas was supplied under a hydrogen pressure of 7 to 13 Kg/cm2. The absorption of hydrogen ceased after 95 minutes from the start of hydrogen supply. After completion of reaction, the autoclave was cooled down to room temperature, and the catalyst was filtrated off from the reaction mixture. The filtrate was adjusted to pH 12.9 with a 48% aqueous solution of sodium hydroxide and the filtrate was concentrated. Water was added to concentrate, and the product was extracted with toluene twice. After phase separation, the toluene layer was concentrated to obtain a concentrate (4.9 g) containing 2-chloro-5-methylaminomethylpyridine, which was analyzed by gas chromatography to find that a yield of 2-chloro-5-methylaminomethylpyridine was 45%.

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 69045-78-9, 2-Chloro-5-(trichloromethyl)pyridine.

Reference:
Patent; Koei Chemical Co., Ltd.; US5424437; (1995); A;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 97004-04-1, (6-Chloropyridin-3-yl)methanamine, 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: (6-Chloropyridin-3-yl)methanamine, blongs to pyridine-derivatives compound. Recommanded Product: (6-Chloropyridin-3-yl)methanamine

A mixture of 3-ethoxy-2-(4-trifluoromethylphenyl hydrazono) propionic acid (0.3 g, 1 mmol), 5-aminomethyl-2-chloropyridine (0.21 g, 1.5 mmol), 1-[3-(dimethylamino) propyl]-3-ethylcarbodiimide hydrochloric acid salt (0.29 g, 1.5 mmol) and chloroform (10 ml) was left at room temperature overnight. The mixture was extracted with chloroform, washed 1 N hydrochloric acid, a saturated sodium bicarbonate water and a saturated brine, dried on anhydrous sodium sulfate and then filtered. The residue obtained by concentrating the resulting filtrate was purified with a silica gel chromatography to obtain N-(6-chloro-3-pyridylmethyl)-3-ethoxy-2-(4-trifluoromethylphenyl hydrazono) propionic acid amide (Compound No. 170) (0.3 g, 0.72 mmol, 72%). Compound No. 170: mp 98-99C; 1H NMR (400 MHz, CDCl3) delta 1.20 (3H, t), 3.57 (2H, q), 4.36 (2H, s), 4.51 (2H, d), 6.22 (2H, d), 7.33 (1 H, d), 7.37 (1 H, d), 7.52 (2H, d), 7.52 (2H, d), 7.64 (1H, dd), 7.85 (1 H, brt).

At the same time, in my other blogs, there are other synthetic methods of this type of compound,97004-04-1, (6-Chloropyridin-3-yl)methanamine, and friends who are interested can also refer to it.

Reference:
Patent; Nihon Nohyaku Co., Ltd.; EP1470752; (2004); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 18699-87-1, 2-Methyl-3-nitropyridine, 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, 18699-87-1, blongs to pyridine-derivatives compound. Recommanded Product: 18699-87-1

Under nitrogen atmosphere, 47.6 g of 2-chloro-3-nitropyridine was dissolved in 500 mL of tetrahydrofuran, and 150 mL of 2M methylzinc chloride in tetrahydrofuran and 6.9 g of tetrakis(triphenylphosphine)palladium(0) were added, and the reaction solution was stirred at 70C for 2 hours. The reaction solution was poured into cold water, extracted with ethyl acetate, washed with water, and dried over anhydrous magnesium sulfate. The solvent was evaporated, and the residue was subjected to column chromatography (n-hexane:ethyl acetate =3:1) to obtain 35.4 g of 2-methyl-3-nitropyridine as a colorless oil. Then 35.4 g of 2-methyl-3-nitropyridine was dissolved in a mixed solution of 300 mL methanol/5 mL triethylamine, added with 5 g of 10% palladium on carbon, and stirred for 6 hours under hydrogen atmosphere and at normal temperature and pressure. The reaction solution was filtered thorough Celite, the solvent was evaporated, and 33.0 g of crudely produced 2-methyl-3-aminopyridine was obtained as a pale brown oil. Next, to 100 mL of a solution of 65 g of crude 3-amino-2-methyl pyridine in dichloromethane were added 60 mL of pyridine and 71 mL of acetic anhydride at room temperature and stirred for 3 hours. The reaction solution was added with about 150 mL of silica gel powder, the solvent was evaporated, and the residue was purified by silica gel column chromatography (ethyl acetate :methanol =100:3), to afford 74 g of the title compound as colorless crystals.1H-NMR (400 MHz, CDCl3) delta2.25 (3H, s), 2.53 (3H, s), 7.00 (1H, bs), 7.18 (1H, dd, J = 4.6, 8.0 Hz), 8.23 (1H, d, J = 8.0 Hz), 8.30 (1H, d, J = 4.6 Hz).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,18699-87-1, its application will become more common.

Reference:
Patent; Eisai Co., Ltd.; EP1510516; (2005); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 179687-79-7, 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 179687-79-7, name is 2-((2-Chloro-4-nitrophenoxy)methyl)pyridine. This compound has unique chemical properties. The synthetic route is as follows.

Example 71; 4-f [3-chloro-4-(pyridin-2-ylmethoxy)phenyl]amino) [1]benzothieno[2,3-d] pyrimidin-7-ol; Step 1. Preparation of 3-Chloro-4-(pyridin-2-ylmethoxy)-phenylamine; EPO 2-chloro-4-nitro phenol (10 g, 57.6 mmol, 1 equiv), 2-pycolyl chloride hydrogen chloride (9.45 g, 57.6 mmol, 1 equiv) cesium carbonate 41.3 (126.8 mmol, 2.2 equiv) and sodium iodide (8.64 g, 57.6 mmol, 1 equiv) were suspended in 200 mL acetonitrile. The reaction mixture was stirred at 60C for 5h. The resulted suspension was filtered and washed with water (400 mL), yielding 2-(2-chloro-4- nitro-phenoxymethyl)-pyridine (8 g, 52%) as a red solid.2-(2-chloro-4-nitro-phenoxyrnethyl)-pyridine (8 g, 30.2mmol, 1 equiv) and iron (8.44 g, 151.1 mmol, 5 equiv) were mixed in acetic acid (100 mL ) and EtOAc (50 mL ) and were stirred at rt overnight. The reaction mixture was filtered through a pad of Celite. The filtrate was concentrated in vacuo and neutralized with saturated Na2CO3 solution. The solution was extracted with EtOAc and the organic layer was washed with brine and concentrated in vacuo. The resulting crude material was purified by flash chromatography eluting with EtOAc/hexane (3:7) to give 3-Chloro- 4-(pyridin-2-ylmethoxy)-phenylamine (3.2 g, 52%) as a white solid. 1H-NMR (CDCl3) delta 5.18 (s, 2H), 6.50 (dd, 1H), 6.76 (d, 1H),. 6.80 (d, 1H), 7.22 (m, 1H), 7.64 (d, 1H), 7.73 (td, 1H), 8.55 (m, 1H); LCMS RT = 0.89 min, [M+H]+ = 235.1.

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 179687-79-7, 2-((2-Chloro-4-nitrophenoxy)methyl)pyridine.

Reference:
Patent; BAYER PHARMACEUTICALS CORPORATION; WO2006/44524; (2006); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem