Day: April 21, 2022

Synthetic Route of 2897-43-0 ,Some common heterocyclic compound, 2897-43-0, molecular formula is C5H3Cl2N3O2, 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.

To a solution of 2,6-dichloro-3-nitro-pyridin-4-amine (2.6 g, 14.4 mmol) from Step A in MeOH (150 mL) was added Raney Nickel catalyst (2 g) and the reaction agitated under a hydrogen atmosphere in a Parr apparatus (35 p.s.i.) for 2 h . The reaction mixture was filtered through a pad of Celite and concentrated to yield the title compound. MS: m/z = 179 (M + 1).

In the field of chemistry, the synthetic routes of compounds are constantly being developed and updated. I will also mention this compound in other articles. 2897-43-0, 2,6-Dichloro-3-nitropyridin-4-amine, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; MERCK & CO., INC.; WO2007/61694; (2007); A2;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthetic Route of 886365-47-5 , The common heterocyclic compound, 886365-47-5, name is 1-(5-Bromo-2-chloropyridin-3-yl)ethanone, molecular formula is C7H5BrClNO, 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.

Preparation of 5-bromo-3-methyl-1H-pyrazolo[3,4-b]pyridine (D-2-6).A mixture of compound D-2-5 (4 g, 16 mmol) and hydrazine (30 mL) in ethanol (300 mL) was stirred at room temperature overnight. TLC (petroleum ether/EtOAc 5:1 ) indicated complete consumption of starting material. The reaction mixture was concentrated in vacuo and the residue was purified via column chromatography (silica gel, petroleum ether/EtOAc 15:1 ) to yield crude compound D-2-6, which was further purified by preparative HPLC to yield pure compound D-2-6 (800 mg, yield: 20%) as a white solid.

The synthetic route of 886365-47-5 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; PFIZER INC.; WO2009/16460; (2009); A2;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

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. 727356-19-6, name is 2-Bromo-6-(chloromethyl)pyridine. This compound has unique chemical properties. The synthetic route is as follows. Product Details of 727356-19-6

Part II: Preparation of (6-bromo-pyridin-2-ylmethyl)-(4-fluorophenyl)-carbamic acid terf-butyl esterTo a solution of (4-fluorophenyl)-carbamic acid terf-butyl ester (60144-53-8, 750 mg, 3.55 mmol) in tetrahydrofuran (10 ml.) was added sodium hydride (60% dispersion in mineral oil, 150 mg, 3.9 mmol). After 30 minutes, tetra-n-butylammonium iodide (51 mg, 0.36 mmol) and 2-bromo-6-chloromethyl-pyridine (804 mg, 3.9 mmol) was added to the reaction and the mixture was heated to 70C. After 1 hour, the reaction was cooled to room temperature, quenched with saturated sodium bicarbonate (10 ml.) and extracted with ethyl acetate (2 x 15 ml_). The organic phases were combined, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. Flash chromatography (silica gel; 10% ethyl acetate in hexanes) provided (6-bromo-pyridin-2-ylmethyl)-(4-fluorophenyl)-carbamic acid terf-butyl ester (700 mg, 1.84 mmol) as an oil which solidified upon standing.

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, 727356-19-6, 2-Bromo-6-(chloromethyl)pyridine.

Reference:
Patent; WYETH; WO2008/73936; (2008); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 90145-48-5, Adding some certain compound to certain chemical reactions, such as: 90145-48-5, name is 5-Bromopyridine-2-carboxamide,molecular formula is C6H5BrN2O, 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 90145-48-5.

Phosphorus oxychloride (111 g, 0.720 mol) was added to a mixture of 5-bromopicolinamide (D8) (58 g, 0.288 mol) in dry toluene (300 ml) The mixture was heated to reflux for 2 hours. The mixture was poured into ice/water, and basified to pH=12 with 2N NaOH. The resulting mixture was extracted with ethyl acetate and the organic phase was washed with brine, dried over Na2SO4, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with a mixture petroleum ether/ethyl acetate 10:1. Collected fractions, after solvent evaporation afforded the title compound (D9) (43.6 g) as a yellow solid.

According to the analysis of related databases, 90145-48-5, the application of this compound in the production field has become more and more popular.

Reference:
Patent; Borriello, Manuela; Rovati, Lucio; Stasi, Luigi Piero; Buzzi, Benedetta; Colace, Fabrizio; US2013/261100; (2013); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of 89694-10-0, 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 89694-10-0, name is 2-Methoxy-3-methyl-5-nitropyridine. This compound has unique chemical properties. The synthetic route is as follows.

A yellow solution of 2-methoxy-3-methyl-5-nitropyridine (68.8 g, 409 mmol) and tert-butyl 2-chloroacetate (77.0 g, 511 mmol) in THF (1 L) was stirred and cooled to -20 C. in a dry ice/isopropanol bath. Potassium tert-butoxide (115 g, 1.02 mol) was added at a rate so that the reaction temperature was less than -10 C. The reaction mixture turned dark purple. When the addition was complete, the cooling bath was removed and the reaction was stirred for 30 min. The stirred reaction mixture was quenched with HCl (500 mL, 2.4 N). The purple solution turned pale yellow and the mixture separated into two layers. The organic layer was separated, washed three times with brine, and concentrated in vacuo. Hexane was added to the amber residue. The mixture was concentrated in vacuo and then dried under high vacuum for 1 hr to give tert-butyl 2-(6-methoxy-5-methyl-3-nitropyridin-2-yl)acetate (83.4 g, 72% yield) as a tan solid: 1H NMR (400 MHz, CDCl3) delta 8.16 (s, 1H), 4.09 (s, 2H), 4.02 (s, 2H), 2.21 (s, 3H), 1.44 (s, 9H); 13C NMR (100 MHz, CDCl3) delta 168.81, 163.63, 147.88, 139.41, 135.19, 120.82, 81.66, 54.69, 44.48, 28.03, 15.27. An analytical sample was recrystallized from hexane to give white needles, mp 71-72.5 C. Anal. calcd. for C13H18N2O5: C, 55.31, H, 6.42, N, 9.92. Found: C, 55.52, H, 6.40, N, 9.84.

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 89694-10-0, 2-Methoxy-3-methyl-5-nitropyridine.

Reference:
Patent; Bristol-Myers Squibb Company; US2010/29684; (2010); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of 75806-86-9 ,Some common heterocyclic compound, 75806-86-9, molecular formula is C5H2BrClN2O2, 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.

Example 8: delta-Chloro-3-nitro-pyridine^-carboxylic acid; [00388] Step 1 : To a mixture of 2-bromo-5-chloro-3-nitro-pyridine (2.5 g, 10.6 mmol), CuI (141 mg, 0.74 mmol), Pd(PPh3)4, (367 mg, 0.32 mmol) and 2- Methyl-3-butyn-2-ol (1.5 mL, 15.8 mmol) was added 1-methyl-2-pyrorolidone (20 mL) followed by Et3N (6 mL, 22 mmol). After stirring for 4 h 30 min at room temperature, the reaction mixture was poured into water (20 mL) and extracted with EtOAc (3 x 30 mL). The combined organic extracts were washed with brine (20 mL), dried (Na2SO4), filtered and concentrated under reduced pressure, and the residue was purified by flash column chromatography over silica gel (EtOAc/Hexanes, 2:98, then 5:95) to provide 4-(5-chloro-3-nitro-pyridin-2-yl)-2- methyl-but-3-yn-2-ol. MS m/z : 241.0 (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,75806-86-9, its application will become more common.

Reference:
Patent; CHEMOCENTRYX, INC.; WO2006/76644; (2006); A2;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of 1142363-52-7, 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.1142363-52-7, name is JNJ-40346527, molecular formula is C27H35N5O2, molecular weight is 461.5991, as common compound, the synthetic route is as follows.

Example 25 4-Cyano-1H-imidazole-2-carboxylic acid[2-(4,4-dimethyl-cyclohex-1-enyl)-6-(2,2,6,6-tetramethyl-tetrahydro-pyran-4-yl)-pyridin-3-yl]-amide(1S)-(+)-10-camphorsulfonic acid salt A solution of 4-cyano-1H-imidazole-2-carboxylic acid[2-(4,4-dimethyl-cyclohex-1-enyl)-6-(2,2,6,6-tetramethyl-tetrahydro-pyran-4-yl)-pyridin-3-yl]-amide (52.4 mg, 0.113 mmol, as prepared in Example 15, step (h)) in EtOH (2 mL) was treated with (1S)-(+)-10-camphorsulfonic acid (26.4 mg, 0.113 mmol) at room temperature for 1 h. The solvents were evaporated in vacuo, and the residue was dried under high vacuum overnight. The solid was dissolved in a minimum amount of EtOH (1 mL) with sonication and heating. While warm, the solution was slowly treated with hexanes until first precipitate was seen at the surface of the solution. The mixture was allowed to stir 30 min at room temperature while material continued to precipitate. The solid was filtered and air-dried to afford the title compound (66.2 mg, 84%) as white crystals. 1H-NMR (CD3OD; 400 MHz): delta 9.17 (d, 1H, J=8.4 Hz), 8.10 (s, 1H), 7.95 (d, 1H, J=8.4 Hz), 6.39-6.32 (m, 1H), 3.76-3.64 (m, 1H), 3.38-3.34 (m, 2H), 2.80-2.75 (m, 1H), 2.75-2.65 (m, 1H), 2.54-2.45 (m, 2H), 2.40-2.30 (m, 1H), 2.25-2.18 (m, 2H), 2.10-2.00 (m, 2H), 1.98-1.86 (m, 3H), 1.76-1.66 (m, 4H), 1.65-1.56 (m, 1H), 1.47-1.38 (m, 7H), 1.30 (s, 6H), 1.15 (m, 9H), 0.87 (s, 3H). Mass spectrum (APCI, m/z): Calcd. for C27H35N5O2, 462.3 (M+H), found 462.3.

The chemical industry reduces the impact on the environment during synthesis 1142363-52-7, I believe this compound will play a more active role in future production and life.

Reference:
Patent; Illig, Carl R.; Chen, Jinsheng; Meegalia, Sanath K.; Wall, Mark J.; US2009/105296; (2009); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of 403-45-2 , The common heterocyclic compound, 403-45-2, name is 6-Fluoronicotinic acid, molecular formula is C6H4FNO2, 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.

Example 40A 6-Fluoro-nicotinic acid tert-butyl ester To a stirred and refluxed solution of 6-fluoro-nicotinic acid (0.092 g, 6.52 mmol) in benzene and 2-methyl-propan-2-ol (2:1, 15:7 mL) was added dropwise N,N-dimethylformamide di-tert-butyl acetal (8.2 mL, 29.6 mmol). The reaction mixture was refluxed for 3 hours, cooled to room temperature and partitioned between aqueous NaHCO3 and dichloromethane. The organic layer was washed with water and brine, dried (MgSO4), filtered, concentrated under reduced pressure and purified by flash chromatography with 15% to 30% ethyl acetate in hexane to provide the titled compound. MS (CI) m/z 197 (M+1)+; 1H NMR (300 MHz, CDCl3) delta ppm 8.82(d, 1H), 8.38(m, 1H), 6.98(d, 1H), 1.64 (s, 9H).

The synthetic route of 403-45-2 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Madar, David J.; Djuric, Stevan W.; Michmerhuizen, Melissa J.; Kopecka, Hana A.; Li, Xiaofeng; Longenecker, Kenton L.; Pei, Zhonghua; Pireh, Daisy; Sham, Hing L.; Stewart, Kent D.; Szczepankiewicz, Bruce G.; Wiedeman, Paul E.; Yong, Hong; US2004/259843; (2004); A1;; ; Patent; Madar, David J.; Djuric, Stevan W.; Michmerhuizen, Melissa J.; Kopecka, Hana A.; Li, Xiaofeng; Longenecker, Kenton L.; Pei, Zhonghua; Pireh, Daisy; Sham, Hing L.; Stewart, Kent D.; Szczepankiewicz, Bruce G.; Wiedeman, Paul E.; Yong, Hong; US2005/215784; (2005); A1;,
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. 131747-55-2, name is 2-Fluoro-3-(hydroxymethyl)pyridine. A new synthetic method of this compound is introduced below., name: 2-Fluoro-3-(hydroxymethyl)pyridine

Dissolve (2-fluoropyridin-3-yl)methanol in 85 mL of dichloromethane.In ice bath for 10 minutes, 21.7 mL (306.04 mmol) of thionyl chloride was slowly added dropwise. The reaction solution changed from yellow to brown and the reaction was completed. The reaction was continued for 2 h with ice bath. The reaction was complete with TLC monitoring. Continue the ice bath for a while and slowly add 100 mL of water. The N2 was blown, and the lye was absorbed into the exhaust gas. The mixture was extracted with methylene chloride (100 mL*3), washed with saturated brine (100 mL), dried over anhydrous MgSO4, and evaporated under reduced pressure to give 7.14 g of a brown liquid, which was used as needed.

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, 131747-55-2, 2-Fluoro-3-(hydroxymethyl)pyridine.

Reference:
Patent; The Chinese People’s Liberation Army Military Academy Of Medical Sciences Poison Pharmaceutical Institute; Li Song; Zheng Zhibing; Lin Feng; Gong Zehui; Lu Xinqiang; Zhou Xinbo; Zhong Wu; Xiao Junhai; Xie Yunde; Li Xingzhou; Wang Xiaokui; (24 pag.)CN107964011; (2018); A;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 188637-63-0, 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.188637-63-0, name is (6-Bromopyridin-2-yl)methanamine, molecular formula is C6H7BrN2, molecular weight is 187.0372, as common compound, the synthetic route is as follows.

[0667] 6-(Bromopyridin-2-yl)methylamine (4.0 g, 21.4 mmol) was added dropwise to acetic anhydride (10 ml) at 0 C. The reaction was warmed to room temperature and to the reaction was added p-toluenesulfonic acid (4.07 g, 20.4 mmol). The reaction was heated in a microwave reactor at 140C for 25 minutes. The reaction was concentrated in vacuo, the crude product was taken up in water, pH adjusted to -9 with iN aqueous NaOH, and extracted with twice with ethyl acetate. The organic layers were dried with Na2SO4, filtered, concentrated in vacuo, and purified by silica gel chromatography to give the title compound. MS (m/z) 213.06 [M+H].

Statistics shows that 188637-63-0 is playing an increasingly important role. we look forward to future research findings about (6-Bromopyridin-2-yl)methanamine.

Reference:
Patent; GILEAD SCIENCES, INC.; BRIZGYS, Gediminas; CANALES, Eda; CHOU, Chien-hung; GRAUPE, Michael; HU, Yunfeng, Eric; LINK, John, O.; LIU, Qi; LU, Yafan; SAITO, Roland, D.; SCHROEDER, Scott, D.; SOMOZA, John, R.; TSE, Winston, C.; ZHANG, Jennifer, R.; WO2014/134566; (2014); A2;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem