Pyridine-derivatives

Each compound has different characteristics, and only by selecting the characteristics of the compound suitable for a specific situation can the compound be applied on a large scale. 106984-91-2, name is 6-Oxo-1,6-dihydropyridine-3-carbaldehyde. This compound has unique chemical properties. The synthetic route is as follows. Product Details of 106984-91-2

To a stirred solution of 5-3 (O.lg, 0.3mMol) and triethylamine (0.08mL, 0.5mMol) in NMR (ImL) was added 17-2 (0.03g, 0.3mMol) and acetic acid (0.03mL, 0.5mMol), followed by sodium triacetoxyborohydride (0.12g, 0.5mMol). After stirring overnight at room temperature, the reaction was filtered through a syringe filter and purified on a Cl 8 reverse phase HPLC to yield 17-3 as the HCl salt. Mass (M+l) calculated: 473.2085 observed: 473.2092.

If you are interested in these compounds, you can also browse my other articles.Thank you for taking the time to read this article. I hope you enjoyed it, 106984-91-2, 6-Oxo-1,6-dihydropyridine-3-carbaldehyde.

Reference:
Patent; MERCK & CO., INC.; WO2006/135627; (2006); A2;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of 38940-62-4, 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.38940-62-4, name is 3-Acetyl-5-bromopyridine, molecular formula is C7H6BrNO, molecular weight is 200.03, as common compound, the synthetic route is as follows.

Commercially available 3-acetyl-5- bromopyridine (6.53 g, 32.8 mmol), solid NaOH (13.1 g, 326 mmol), and hydrazine hydrate (13 mL) was heated in di ethylene glycol (25 mL) at 140 0C for 4 hours. The reaction mixture was partitioned between ether and water. The organic layer was separated and concentrated to give a residue which was purified using flash chromatography to give an oil. This was dissolved in tetrahydrofuran (40 mL) and cooled to 0 0C. Isopropylmagnesiumchloride (20 mL, 2.0 M in THF) was syringed in and the reaction mixture was stirred for 2 hours at room temperature. N,N-dimethylformamide (7 mL) in tetrahydrofuran (15 mL) was added and stirring was continued for. an additional hour. The solution was quenched with 2 N HCl to pH of 3 then partitioned between ethyl acetate and water. The organic layer was separated and concentrated to give a residue which was purified using flash chromatography to give 3- ethyl-5-formylpyridine (0.78 g, 18%) as a solid. 1H NMR (DMSO-^6): delta 10.1 (s, IH), 8.91 (s, IH), 8.71 (s, IH), 8.00 (s, IH), 2.75 (q, 2H), 1.31 (t, 3H). MS m/z calculated for (M + H)+ 152, found 152.

The chemical industry reduces the impact on the environment during synthesis 38940-62-4, I believe this compound will play a more active role in future production and life.

Reference:
Patent; SIGNAL PHARMACEUTICALS, LLC; WO2007/84560; (2007); A2;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 929617-35-6, 5-Bromo-1H-pyrazolo[3,4-c]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, category: pyridine-derivatives, blongs to pyridine-derivatives compound. category: pyridine-derivatives

A suspension of 5-bromo-lH-pyrazolo[3,4-c]pyridine (760 mg, 3.80 mmol) in DCM (10 mL) was treated with DMAP (50 mg, 0.41 mmol) and Boc20 (1.00 g, 4.58 mmol). After stirring for 20 min, a homogeneous solution had formed. The reaction was stirred another 12 hours, after which it was washed with 1 N aqueous HCl, water, dried (Na2S04) and concentrated to dryness, providing tert-butyl 5-bromo-lH-pyrazolo[3,4-c]pyridine-l- carboxylate: MS (EI) calc’d for CiiHi3BrN302 [M+H]+ 298 and 300, found 298 and 300; 1H MR (600 MHz, CDC13) delta 9.30 (s, 1 H), 8.16 (s, 1 H), 7.83 (s, 1 H), 1.71 (s, 9 H)

At the same time, in my other blogs, there are other synthetic methods of this type of compound,929617-35-6, 5-Bromo-1H-pyrazolo[3,4-c]pyridine, and friends who are interested can also refer to it.

Reference:
Patent; MERCK SHARP & DOHME CORP.; SILIPHAIVANH, Phieng; METHOT, Joey; LIPFORD, Kathryn Ann; MOLINARI, Danielle; SLOMAN, David, L.; WITTER, David; ZHOU, Hua; BOYCE, Christopher; HUANG, Xianhai; LIM, Jongwon; GUERIN, David; KARUNAKARAN, Ganesh Babu; BAKSHI, Raman Kumar; LIU, Ziping; FU, Jianmin; WAN, Zhilong; LIU, Wei; (216 pag.)WO2016/100050; (2016); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 851386-34-0, 2,3-Difluoro-4-iodopyridine, 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, Formula: C5H2F2IN, blongs to pyridine-derivatives compound. Formula: C5H2F2IN

Tetrakis(triphenylphosphine)palladium(0) (1.91 mg, 1.66 mmol) was added to a solution of methyl 3-amino-5-(5,5-dimethyl-1,3,2-dioxaborinan-2-yl)-2-nitrobenzoate (6.1 g, 19.9 mmol), 2,3-difluoro-4-iodopyridine (4.0 g, 16.6 mmol), and potassium phosphate tribasic (10.6 g, 49.8 mmol) in dioxane (80 mL) and water (20 mL). Nitrogen was bubbled for 10 minutes and the reaction mixture was stirred at 80° C. for 10 hours. Upon cooling, the reaction mixture was partitioned between ethyl acetate and water. The organic phase was washed with brine, dried with magnesium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by silica gel column chromatography eluting with 5 to 70percent of (5percent methanol in ethyl acetate) in hexane to afford methyl 3-amino-5-(2,3-difluoropyridin-4-yl)-2-nitrobenzoate. ES/MS m/z=310.2 (M+H)+.

At the same time, in my other blogs, there are other synthetic methods of this type of compound,851386-34-0, 2,3-Difluoro-4-iodopyridine, and friends who are interested can also refer to it.

Reference:
Patent; Gilead Sciences, Inc.; Chandrasekhar, Jayaraman; Patel, Leena; Perreault, Stephane; Phillips, Gary; Till, Nicholas Alexander; Treiberg, Jennifer Anne; (118 pag.)US2018/86768; (2018); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 52568-28-2, 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 52568-28-2 as follows.

General procedure: To a solution of the acid (1 equiv.) in DCM (0.2 M) were added EDCI (1.2 equiv.), HOBt (1.2 equiv.), DIPEA (1.2 equiv.) at 0 C. After the mixture was stirred for 10 min, the amine (1.2 equiv.) was added. The reaction was stirred overnight at room temperature. Then water was added and the mixture was extracted with DCM. The combined organic layer was washed with saturated NaHCO3, brine, dried over Na2SO4 and concentrated. The crude product was purified by flash column chromatography on silica gel to give the desired product.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,52568-28-2, its application will become more common.

Reference:
Article; Wang, Haifeng; Niu, Youhong; Zhang, Guoying; Ye, Xin-Shan; Tetrahedron Letters; vol. 57; 41; (2016); p. 4544 – 4548;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Application of 19346-45-3, 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 19346-45-3, name is 2-Fluoro-6-methyl-3-nitropyridine. This compound has unique chemical properties. The synthetic route is as follows.

General procedure: The dimethyl derivatives (4,4?, 5,5? or 6,6?) of 3,3?-dinitro-2,2?-azobipyridine were synthesized from the respective hydrazo-derivatives obtained previously from 3-nitro-4(or 5 or 6)-methyl-2-hydrazine-pyridine, respectively. Syntheses of these hydrazo derivatives were very similar to the synthesis of 3,3?-dinitro-2,2?-hydrazobipyridine. Instead of ethanol n-propanol was used and its mixtures were heated at boiling temperature for 30 min in the water bath. 2.52 g (0.015 mol) of 3-nitro-4(or 5 or 6)-methyl-2-hydrazine-pyridine were used to synthesis. The synthesized red?brown needle-like crystals of 4,4?-dimethyl-3,3?-dinitro-2,2?-hydrazobipyridine melt with decomposition at 255°C. The yield was 53.1percent. The synthesized brown needle-like crystals of 5,5?-dimethyl-3,3?-dinitro-2,2?-hydrazobipyridine melt with decomposition at 285°C. The yield was 54.0percent. The synthesized dark?brown needle-like crystals of 6,6?-dimethyl-3,3?-dinitro-2,2?-hydrazobipyridine melt with decomposition at 275°C. The yield was 51.0percent. 1 g of the obtained in this way 4,4?(or 5,5? or 6,6?)-3,3?-dinitro-2,2?-hydrazobipyridine was used to obtain respective azo derivatives in the same way as 3NAP. The synthesized orange needle-like crystals of 4,4?-dimethyl-3,3?-dinitro-2,2?-azobipyridine (4M3NAP) melt with decomposition at 260°C. The yield was 74.2percent. The synthesized orange needle-like crystals of 5,5?-dimethyl-3,3?-dinitro-2,2?-azobipyridine (5M3NAP) melt with decomposition at 256°C. The yield was 77.1percent. The synthesized orange powder of 6,6?-dimethyl-3,3?-dinitro-2,2?-azobipyridine (6M3NAP) melt with decomposition at 206°C. The yield was 80.3percent [51,52,54].

According to the analysis of related databases, 19346-45-3, the application of this compound in the production field has become more and more popular.

Reference:
Article; Kucharska; Hanuza; Lorenc; Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy; vol. 127; (2014); p. 370 – 380;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

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. 65515-33-5, name is 6-Chloro-2-methoxynicotinic acid. A new synthetic method of this compound is introduced below., Safety of 6-Chloro-2-methoxynicotinic acid

To an oven-dried 40 mL vial was added 6-chloro-2-methoxynicotinic acid (2.1 equiv.) , 2,2?- (2,2?-dichloro-[l,r-biphenyl]-3,3?-diyl)bis(4,4,5,5-tetramethyl-l,3,2-dioxaborolane), potassium carbonate (3.0 equiv.), Pd(dppf)Ch (10 mol %), dimethylformamide (0.2M), and water (10 vol %). The contents of the vial were sparged with nitrogen for 30 seconds then heated to 90 C for 45 minutes. After cooling to room temperature, the mixture was purified by HPLC to yield 6,6?-(2,2?-dichloro-[l,l?- biphenyl]-3,3?-diyl)bis(2-methoxynicotinic acid).

If you are interested in these compounds, you can also browse my other articles.Thank you for taking the time to read this article. I hope you enjoyed it, 65515-33-5, 6-Chloro-2-methoxynicotinic acid.

Reference:
Patent; GILEAD SCIENCES, INC.; AKTOUDIANAKIS, Evangelos; CHO, Aesop; DU, Zhimin; GRAUPE, Michael; LAD, Lateshkumar Thakorlal; MACHICAO TELLO, Paulo A.; MEDLEY, Jonathan William; METOBO, Samuel E.; MUKHERJEE, Prasenjit Kumar; NADUTHAMBI, Devan; PARKHILL, Eric Q.; PHILLIPS, Barton W.; SIMONOVICH, Scott Preston; SQUIRES, Neil H.; WANG, Peiyuan; WATKINS, William J.; XU, Jie; YANG, Kin Shing; ZIEBENHAUS, Christopher Allen; (300 pag.)WO2019/204609; (2019); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 98198-48-2, 2-Amino-5-bromo-4-methylpyridine, 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, 98198-48-2, blongs to pyridine-derivatives compound. category: pyridine-derivatives

2-Amino-5-bromo-4-methylpyridine (2.0 g, 10.7 mmol) was dissolved in 48% aqueous HBr (14 mL, 123 mmol) and cooled to 2 0C in a salt/ice bath. Bromine (1.65 mL, 32.1 mmol) was added dropwise keeping the internal temperature below 2 0C. A solution of sodium nitrite (3.69 g, 53.5 mmol) in water (5 mL) was added keeping the internal temperature below 5 0C and stirred for 1 h between 0 0C and 5 0C. The pH was adjusted to ~13 by slow addition with cooling of 50% NaOH (aq). After warming to r.t. the reaction was extracted with ether, the organics were dried over MgSO4 and concentrated to give a brown oil. Flash chromatography on silica gel eluting with 5% ether/hexane gave the product as a white solid (1.83 g, 7.29 mmol, 68%). MS [M+H]+: 251.9; tR=2.3 min. (method 1 )

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,98198-48-2, its application will become more common.

Reference:
Patent; NEUROCRINE BIOSCIENCES, INC.; WO2008/124610; (2008); 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.626-60-8, name is 3-Chloropyridine, molecular formula is C5H4ClN, molecular weight is 113.54, as common compound, the synthetic route is as follows.Application In Synthesis of 3-Chloropyridine

General procedure: Under N2 atmosphere, NHC-Pd(II)-Im 1 (1.0 mol%), dry toluene (2.0 mL), aryl chlorides 2 (0.81 mmol), aryltrimethoxysilanes 3 (2.0 equiv) and TBAF?3H2O (2.0 equiv) were successively added into a Schlenk reaction tube. Then the tube was placed in a 120 C oil bath and stirred for 3 h. The mixture was then allowed to cool to room temperature, diluted with ethyl acetate and washed with brine, dried over anhydrous Na2SO4, concentrated in vacuo and then purified by flash chromatography to give the pure products 4.

At the same time, in my other blogs, there are other synthetic methods of this type of compound,626-60-8, 3-Chloropyridine, and friends who are interested can also refer to it.

Reference:
Article; Gu, Zheng-Song; Shao, Li-Xiong; Lu, Jian-Mei; Journal of Organometallic Chemistry; vol. 700; (2012); p. 132 – 134;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 624-28-2, 2,5-Dibromopyridine, 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, Product Details of 624-28-2, blongs to pyridine-derivatives compound. Product Details of 624-28-2

3.1. 1,1-dimethylethyl 4-(5-bromo-2-pyridyl)-1-piperazinecarboxylate 29.2 g (157 mmol) of 1,1-dimethylethyl 1-piperazine-carboxylate, 37 g (157 mmol) of 2,5-dibromopyridine and 21.7 g (157 mmol) of potassium carbonate suspended in 27 ml of dimethyl sulfoxide (DMSO) are introduced into an autoclave. The mixture is then heated at 150 C. for 21 hours. The reaction mixture is allowed to cool to room temperature, it is taken up in ethyl acetate and water and the insoluble material is then separated out by filtration. The aqueous phase is separated out and extracted twice with ethyl acetate, the combined organic phases are washed with saturated aqueous sodium chloride solution and dried over sodium sulfate, and the filtrate is concentrated under reduced pressure. The residue obtained is purified by chromatography on silica gel, eluding with a 99/1 mixture of dichloromethane and methanol. 44 g of product are thus obtained in the form of a white solid. m.p. ( C.): 83-85 C.

At the same time, in my other blogs, there are other synthetic methods of this type of compound,624-28-2, 2,5-Dibromopyridine, and friends who are interested can also refer to it.

Reference:
Patent; SANOFI-AVENTIS; US2006/293310; (2006); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem