Day: April 12, 2022

Electric Literature of 58602-02-1, 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. 58602-02-1, name is 2,6-Difluoro-3-nitropyridine, molecular formula is C5H2F2N2O2, 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.

b 2-(Ethylamino)-6-fluoro-3-nitropyridine To a solution of 2,6-difluoro-3-nitropyridine (45.7 g, 285 mmol) in THF (500 mL) at -40 C. was added drop-wise a solution of ethylamine (25.7 g, 570 mmol) in THF (250 mL). After 30 min, the reaction mixture was concentrated under reduced pressure and the residue was dissolved in EtOAc. The organic phase was washed with brine, dried (MgSO4), filtered and concentrated. The resulting yellow solid was purified by flash chromatography (15% EtOAc in hexane) to give the title compound (43.2 g, 82% yield) as a yellow solid.

According to the analysis of related databases, 58602-02-1, the application of this compound in the production field has become more and more popular.

Reference:
Patent; Simoneau, Bruno; US2002/28807; (2002); A1;,
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. 193274-02-1, name is tert-Butyl 3a-benzyl-2-methyl-3-oxo-3a,4,6,7-tetrahydro-2H-pyrazolo[4,3-c]pyridine-5(3H)-carboxylate. This compound has unique chemical properties. The synthetic route is as follows. Application In Synthesis of tert-Butyl 3a-benzyl-2-methyl-3-oxo-3a,4,6,7-tetrahydro-2H-pyrazolo[4,3-c]pyridine-5(3H)-carboxylate

A clean, nitrogen purged reactor was charged with methylene chloride (471 L) and 2,3,3a,4,6,7-hexahydro-2-methyl-3-oxo-3a-(phenylmethyl)-5H-pyrazolo[4,3-c]pyridine-5-carboxylic acid 1,1-dimethylethyl ester (prepared according to Preparation Five, Step E, 47.0 kg, 1.0 eq.). The mixture was agitated and cooled to between -5C and 5C. The reaction mixture was slowly charged with triflouroacetic acid (117 kg, 7.5 eq.). The reaction mixture was warmed to a temperature between 20C and 30C and stirred for 12 to 15 hours. The reaction mixture was quenched by slow addition of an aqueous solution of 10% sodium carbonate (486 L, 0.5 eq.) at a temperature between 5C and 15C. The organic layer was separated and the aqueous layer extracted with methylene chloride (19 L). A mixture of acetone (456 L), water (56.4 L), and L-tartaric acid (22.6 kg, 1.1 eq.) was prepared in a second reactor. The tartaric acid mixture was combined with the organic layers at a temperature between 20C and 25C. The resulting slurry was heated to a temperature between 35C and 45C and stirred for 8 to 18 hours (overnight). When the reaction was judged to be complete, the slurry was cooled and granulated at a temperature between 0C and 10C for three to four hours and filtered. The product cake was washed with a mixture of acetone (40 L) and water (4.5 L). The product was dried under vacuum using only mild heat (applied if evaporation of acetone results in cooling). A yield of 37.7 kg of (3aR)-2,3a,4,5,6,7-hexahydro-2-methyl-3a-(phenylmethyl)-3H-pyrazolo[4,3-c]pyridin-3-one, (2R,3R)-2,3-dihydroxybutanedioate (1:1) was obtained (70.1% yield).

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, 193274-02-1, tert-Butyl 3a-benzyl-2-methyl-3-oxo-3a,4,6,7-tetrahydro-2H-pyrazolo[4,3-c]pyridine-5(3H)-carboxylate.

Reference:
Patent; Pfizer Products Inc.; EP1031575; (2000); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthetic Route of 885168-04-7, 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.885168-04-7, name is 5-Bromo-3-chloropicolinaldehyde, molecular formula is C6H3BrClNO, molecular weight is 220.4511, as common compound, the synthetic route is as follows.

To a solution of Compound 1 (10 g) in methylene chloride (200 mL) were added oxalyl chloride (4.43 mL) andN,N-dimethylformamide (0.16 mL) at room temperature, and the mixture was stirred at room temperature for 2 hours.The reaction solution was concentrated under reduced pressure, the residue was dissolved in tetrahydrofuran (50 mL),and this was added dropwise to a suspension of thiosemicarbazide (3.85 g) and pyridine (75 mL) under ice cooling over10 minutes. After dropwise addition, the mixture was stirred at room temperature for 2 hours and concentrated underreduced pressure. The residue was dissolved in a 2N aqueous sodium hydroxide solution (210 mL), and heated at refluxfor 16 hours. The reaction solution was ice cooled and neutralized with concentrated hydrochloric acid (35 mL). Thedeposit was collected by filtration and washed with water and methanol. The obtained solid was suspended and washedin diethyl ether (50 mL), collected by filtration and dried at 50 C under reduced pressure to obtain Compound 2 (9.46g) as a beige solid.MS (m/z): 291/293/295 [M+H]+

The chemical industry reduces the impact on the environment during synthesis 885168-04-7, I believe this compound will play a more active role in future production and life.

Reference:
Patent; Mitsubishi Tanabe Pharma Corporation; SARUTA, Kunio; HAYASHI, Norimitsu; SAKURAI, Osamu; SAWAMOTO, Hiroaki; OBOKI, Eri; EP2862856; (2015); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 145255-19-2, 5-Aminopyridine-2-carboxamide, 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, Application In Synthesis of 5-Aminopyridine-2-carboxamide, blongs to pyridine-derivatives compound. Application In Synthesis of 5-Aminopyridine-2-carboxamide

EXAMPLE 238: 4-[4-(6-CarbamoyIpyridin-3-ylamino)-7No.-pyrrolo[2,3-rf]pyriraidin-6-yl]-3,6-dihydro-2JHr-pyridme-l-carboxylic acid tert-butyl ester; .NH2^»[673] Into the DMF (ImL) solution of 4-(4-chloro-7No.-pyrrolo[2,3-J]pyrimidin-6-yl)-3,6-dihydro-2/ir-pyridine-l-carboxylic acid tert-butyl ester (122mg, 0.363mmol) wasadded t-BuOK (1M in ^-BuOH, 0.726mL, 0.726mmol) dropwise at RT under N2 over 5min.The mixture was then put in an ice/water bath and stirred for lOmin. After that time, theDMF (ImL) solution of 5-aminopyridine-2-carboxylic acid amide (99.5mg, 0.726mmol) wasadded into the above mixture dropwise. The reaction mixture was warmed to RT.Pd2(dba)3-CHCl3 (9.4mg, 2.5%eq.) and^(+)-BINAP (22.6mg, O.leq.) were added, and themixture was heated at 100C for 24h. The mixture was filtered and the filtrate wasconcentrated in vacua. The crude was submitted to MS directed purification. A brown oilwas obtained that was purified further by HPLC to obtain the title compound as an off-whitesolid. ‘H NMR (DMSO-dft 400 MHz): 5 = 1.50 (s, 9 H), 2.50 (m, 2 H), 3.64 (t, 2 H, J= 5.6Hz), 4.12 (bra, 2 H), 6.50 (bra, 1 H), 6.88 (s, 1 H), 7.53 (d, 1 H, J= 4.2 Hz), 8.04 – 8.05 (m, 1H), 8.08 (d, 1 H, J= 8.8 Hz), 8.44 (s, 1 H), 8.68 (dd, 1 H, /= 2.4 & 8.4 Hz), 9.12 (d, 1 H, J=2.4 Hz), 9.91 (s, 1 H), 12.18 (s, 1 H). MS (ES+): m/z 436.10 (100) [MET]. HPLC: fe = 2.75min (ZQ2000, polar_5 min).

At the same time, in my other blogs, there are other synthetic methods of this type of compound,145255-19-2, 5-Aminopyridine-2-carboxamide, and friends who are interested can also refer to it.

Reference:
Patent; OSI PHARMACEUTICALS, INC.; WO2006/17443; (2006); A2;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Application of 1443759-42-9, 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 1443759-42-9 as follows.

36.3: 4-Bromo-6-methoxy-pyridine-2-carboxylic acid methyl ester To a mixture of 3.47 mL (29.3 mmol) tert-butyl nitrite and 6.60 g (29.3 mmol) copper(II)bromide in 120 mL acetonitrile was added a solution of 3.33 g (18.3 mmol) 4-amino- 6-methoxy-pyridine-2-carboxylic acid methyl ester in 30 mL acetonitrile dropwise at 40 C. This mixture was stirred at 80 C for 1 h, then poured into ice water. The precipitate was filtered off, washed with water and dried. The crude material was purified by flash chromatography (PE/EtOAc = 4/1 -> 3/1). yield: 2.50 g (56 %) + ESI-MS: m/z = 246 (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,1443759-42-9, its application will become more common.

Reference:
Patent; BOEHRINGER INGELHEIM INTERNATIONAL GMBH; HEIMANN, Annekatrin; DAHMANN, Georg; GRUNDL, Marc; MUELLER, Stephan Georg; WELLENZOHN, Bernd; WO2013/87805; (2013); 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.251101-36-7, name is 3-Methylisonicotinamide, molecular formula is C7H8N2O, molecular weight is 136.15, as common compound, the synthetic route is as follows.HPLC of Formula: C7H8N2O

3-Methyl-4-cyanopyridine (123) Phosphorus oxychloride (100 mL, 1.1 mol) was slowly added to the crude amide 122 (15 g, 0.11 mol) while cooling the mixture in an ice bath. The resulting solution was heated at reflux for 24 h. The reaction mixture was cooled to room temperature and the excess phosphorus oxychloride was removed under reduced pressure. Crushed ice (150 g) was slowly added to the oily residue, and the solution was neutralized with saturated ammonium hydroxide. The crude product was extracted with chloroform (3*100 mL). The combined extracts were filtered through a layer of silica gel, washing with extra portions of chloroform. The filtrates were evaporated to dryness to yield 123 as colorless crystals (12 g, 90%): mp 45-47 C. (lit. (J. Med. Chem. 2000, 43, 3168-3185) mp 50 C.). 1H NMR (300 MHz, CDCl3) delta 8.66 (s, 1H), 8.59 (d, J=5.0 Hz, 1H), 7.45 (d, J=5.0 Hz, 1H), 2.54 (s, 3H).

At the same time, in my other blogs, there are other synthetic methods of this type of compound,251101-36-7, 3-Methylisonicotinamide, and friends who are interested can also refer to it.

Reference:
Patent; CUSHMAN, Mark S.; KISELEV, Evgeny A.; MORRELL, Andrew E.; US2014/18360; (2014); 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. 34486-24-3, name is 2-Amino-6-(trifluoromethyl)pyridine, the common compound, a new synthetic route is introduced below. Formula: C6H5F3N2

The 6 – (trifluoromethyl) pyridin -2 amine (972 mg, 6 . 0mmol) dissolved in chloroform (10 ml) in, cooling to 0 C, adding N-bromo succinimide (1.28g, 7 . 2mmol), stir at room temperature 3 hours, concentrated, crude product by silica gel column chromatography (petroleum ether: ethyl acetate = 2:1) purification, to obtain solid title compound (0.58g, yield 40.3%).

The synthetic route of 34486-24-3 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Shandong Xuanzhu Oharma Co., Ltd.; Wu, Yongjian; (47 pag.)CN105541792; (2016); A;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Application of 22282-99-1, 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 22282-99-1, name is 4-Bromo-2-methylpyridine. This compound has unique chemical properties. The synthetic route is as follows.

4-Bromo-2-methylpyridine (70 g, 407 mmol) and triethylamine (141 mL, 1.02 mol) were combined in DMF (400 mL) and MeOH (400 mL). The solution was purged with N2 for 10 minutes, and then Pd(dppf)2 (15 g, 20.35 mmol) was added. Carbon monoxide was bubbled through the mixture for 10 minutes, and then the reaction was stirred at 75 C overnight. The mixture was concentrated and the residue was diluted with 1 : 1 EtOAc:hexanes (2L) and washed 10 times with H20/brine. The aqueous layer was back-extracted 6 times, and the combined organic layers were dried, filtered, and concentrated. The residue was purified by silica gel chromatography to give the title compound.

According to the analysis of related databases, 22282-99-1, the application of this compound in the production field has become more and more popular.

Reference:
Patent; AMIRA PHARMACEUTICALS, INC.; STEARNS, Brian, Andrew; ROPPE, Jeffrey, Roger; PARR, Timothy, Andrew; STOCK, Nicholas, Simon; VOLKOTS, Deborah; HUTCHINSON, John, Howard; WO2011/38086; (2011); A2;,
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.885168-04-7, name is 5-Bromo-3-chloropicolinaldehyde, molecular formula is C6H3BrClNO, molecular weight is 220.4511, as common compound, the synthetic route is as follows.Computed Properties of C6H3BrClNO

Methane sulfonic acid (35.7 ml, 550.45 mmol, 10 eq) was added to a solution of 5-bromo-3-chloro-picolinaldehyde (see Example 88) (12 g, 55.04 mmol, I eq) in DCM (200 ml) at 0C. But-3-en-1-ol (4.5 ml, 55.04 mmol, 1 eq) was added and the mixture stirred for 16 h at RT. The RM was quenched with sat. Na2CO3 solution and extracted with DCM (3 X 150 ml). The organics were washed with water (150 ml) and brine (150 ml), dried (Na2SQ4) and the the solvent was distilled-off under reduced pressure to afford the desired product (18 g).

At the same time, in my other blogs, there are other synthetic methods of this type of compound,885168-04-7, 5-Bromo-3-chloropicolinaldehyde, and friends who are interested can also refer to it.

Reference:
Patent; GRUeNENTHAL GMBH; SCHUNK, Stefan; REICH, Melanie; JAKOB, Florian; DAMANN, Nils; HAURAND, Michael; KLESS, Achim; ROGERS, Marc; SUTTON, Kathy; WO2015/158427; (2015); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 866775-18-0, Methyl 3-amino-6-bromo-5-(trifluoromethyl)picolinate, 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, 866775-18-0, blongs to pyridine-derivatives compound. SDS of cas: 866775-18-0

3-Amino-6-bromo-5-trifluoromethyl-pyridine-2-carboxylic acid methyl ester (1.40 g, 4.68 mmol) was suspended in MeOH (15 ml); Sodium hydroxide (2.0 M aqueous solution) (14.04 ml, 28.1 mmol) was added and the suspension was stirred at RT overnight. The reaction mixture was concentrated under reduced pressure and the resulting residue was dissolved in water (100 ml) and then acidifed by the addition of 5.0M HCI(aq). The product was extracted into ethyl acetate (2 x 75 ml) and the combined organic extracts were washed with water (50 ml), brine (25 ml), dried (MgS04) and concentrated under reduced pressure to afford the title product as a yellow solid. H-NMR: 9400MHz, DMSO-d6) ? 13.24 (1 H, br s, C02H), 7.74 (1 H, s, ArH), 7.17 92H, br s ArNH2). m/z 285.1 , 287.1 [M+H]+ Intermediate B

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,866775-18-0, its application will become more common.

Reference:
Patent; NOVARTIS AG; LEGRAND, Darren Mark; WO2013/38378; (2013); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem