Day: September 13, 2021

Electric Literature of 884495-39-0, 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. 884495-39-0, name is 5-Bromo-2-methoxypyridin-3-amine, molecular formula is C6H7BrN2O, 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.

(1) 5-Bromo-3-amino-2-methoxypyridine (0.097 g, 0.48 mmol), pyridine (0.057 g, 0.72 mmol), and dissolved in dichloromethane (0.77 mL) to prepare a reaction solution 1, phenylsulfonyl chloride (0.10g, 0.58mmol) to prepare reaction solution 2,The flow rate (0.5mL / min) set by the intelligent numerical control sampler was simultaneously introduced into the first three-way mixer (ambient temperature 0 C) through a 500 mum inner diameter picker tube and mixed, and then flowed out under its own pressure and entered Set a temperature-controlled (25 C) picker tube with an inner diameter of 500 mum, complete the sulfonamidation reaction under the set residence time t1 (0.5min), and then pass the back pressure valve to obtain the first effluent;

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 884495-39-0, 5-Bromo-2-methoxypyridin-3-amine.

Reference:
Patent; Fudan University; Zhuhai Fudan Chuangxin Institute; Ling Yun; Zhou Yaming; Jia Yu; Deng Mingli; Liu Xiaofeng; Yang Yongtai; Chen Zhenxia; (30 pag.)CN110498798; (2019); A;,
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.1334411-79-8, name is 4-Bromo-2-(2,6-dichlorophenyl)-1H-imidazo[4,5-c]pyridine, molecular formula is C12H6BrCl2N3, molecular weight is 343.01, as common compound, the synthetic route is as follows.HPLC of Formula: C12H6BrCl2N3

To a solution of 4-bromo-2-(2,6-dichlorophenyl)-lH-imidazo[4,5-c]pyridine (1.0 g,2.9 mmol) in DMF (5 mL) at 23 C was added sodium hydride (0.1 1 g, 4.4 mmol). The mixture was allowed to stir at 23 C for 30 min before iodomethane (0.46 g, 3.2 mmol) was added in one portion and the mixture was stirred at 23 C overnight. The reaction mixture was quenched with water (50 mL), extracted with ethyl acetate (3 x 50 ml). The combined organic phase was washed with brine, dried over Na2S04, and then concentrated. The residue was purified by column chromatography on silica gel with dichloromethane/rnethanol ( 10:1) to give the desired products as a mixture (0.65 g, 62% yield). LCMS(ESI) m/z: 358.1 [M+H+].

At the same time, in my other blogs, there are other synthetic methods of this type of compound,1334411-79-8, 4-Bromo-2-(2,6-dichlorophenyl)-1H-imidazo[4,5-c]pyridine, and friends who are interested can also refer to it.

Reference:
Patent; F. HOFFMANN-LA ROCHE AG; LAI, Yingjie; LIANG, Jun; MAGNUSON, Steven R.; TSUI, Vickie H.; ZHANG, Birong; ROBARGE, Kirk; WO2011/113802; (2011); A2;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

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. 16498-81-0, name is 2-Methoxynicotinic acid, molecular formula is C7H7NO3, 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. HPLC of Formula: C7H7NO3

EXAMPLE 1 A 306 mg. (0.002 mole) sample of 2-methoxynicotinic acid (the product of Preparation A) was added in one portion to 20 ml. of well-stirred 5.25% aqueous sodium hypochlorite solution (Clorox). The resulting mixture (now a solution) was then allowed to stir at room temperature (~20 C.) for a period of approximately 18 hours (i.e., overnight). Upon completion of this step, the reaction mixture was acidified with 10 ml. of 1N hydrochloric acid and the resulting precipitate was subsequently extracted with chloroform. The organic extracts were then combined, dried over anhydrous magnesium sulfate and filtered, and the resulting filtrate was subsequently concentrated in vacuo to afford 195 mg. (52%) of pure 5-chloro-2-methoxynicotinic acid, m.p. 139-141 C. (literature m.p. 149-150 C., according to D. E. Kuhla et al. in U.S. Pat. No. 3,879,403). The pure product was further characterized by means of nuclear magnetic resonance data and mass spectroscopy.

With the rapid development of chemical substances, we look forward to future research findings about 16498-81-0.

Reference:
Patent; Pfizer Inc.; US4716231; (1987); A;,
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. 55717-45-8, name is 6-Bromopyridin-3-ol, the common compound, a new synthetic route is introduced below. HPLC of Formula: C5H4BrNO

Reference Example 65 5-(benzyloxy)pyridine-2-carbaldehyde [Show Image] A solution of 6-bromopyridin-3-ol (4.20 g) in N,N-dimethylformamide (100 mL) was purged with nitrogen, sodium hydride (60%, oil, 1.06 g) was added under ice-cooling, and the mixture was stirred at 0C for 15 min. Benzyl bromide (3.15 mL) was added to the reaction mixture, and the mixture was warmed to room temperature, and stirred at room temperature for 16 hr. A saturated aqueous ammonium chloride solution was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed successively with water and saturated brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:hexane = 10:90 – 50:50, volume ratio) to give a colorless oil. A solution of the obtained oil in toluene (10 mL) was added to a solution of tributylmagnesium ate complex in toluene-tetrahydrofuran-hexane prepared from a 1.6M n-butyllithium hexane solution (8.4 mL) and a 2.0M butylmagnesium chloride tetrahydrofuran solution (3.4 mL) in at -10C, and the mixture was stirred at – 10C for 2.5 hr. N,N-dimethylformamide (1.59 mL) was added to the reaction mixture, and the mixture was warmed to room temperature and stirred at room temperature for 2 hr. 10% Aqueous citric acid solution was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed successively with water and saturated brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:hexane = 5:95 – 50:50, volume ratio) to give the title compound (1.00 g, yield 17%) as a colorless oil. MS:214(MH+).

The synthetic route of 55717-45-8 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Takeda Pharmaceutical Company Limited; EP2149550; (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. 189281-66-1, name is Methyl 2,6-dichloro-5-fluoronicotinate, the common compound, a new synthetic route is introduced below. HPLC of Formula: C7H4Cl2FNO2

A mixture of 2,6-dichloro-5-fluoro-nicotinic acid methyl ester (1.00 g 4.46 mmol), trimethylboroxin (0.620 mL, 4.40 mmol), tetrakis(triphenylphosphine)palladium (0.500 g, 0.433 mmol) and potassium carbonate (1.50 g, 12.0 mmol) is heated at 110 0C overnight. The mixture is cooled to room temperature, diluted with water, and extracted with EtOAc. The combined organic phase is washed with water followed by brine, then dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue is purified by flash silica gel chromatography using a gradient of 0-30% EtOAc/heptane to provide 0.410 g (45.1%) of 2-chloro-5-fluoro-6-methyl-nicotinic acid methyl ester as a solid.

The synthetic route of 189281-66-1 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; BOEHRINGER INGELHEIM INTERNATIONAL GMBH; GINN, John David; MARSHALL, Daniel Richard; PROKOPOWICZ, Anthony S.; SCHYLER, Sabine; SIBLEY, Robert; TURNER, Michael Robert; WU, Di; WU, Frank; WO2010/126851; (2010); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 800401-68-7, 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.800401-68-7, name is 5-Chloro-1H-pyrrolo[2,3-c]pyridine-2-carboxylic acid, molecular formula is C8H5ClN2O2, molecular weight is 196.59, as common compound, the synthetic route is as follows.

Example 69: 5-Chloro-lH-pyrrolo[2,3-c]pyridine-2-carboxylic acid (2-oxo-l,2,3,4-tetrahydro- [1,5] naphthyridin-3-yl)amide; To a solution of 5-chloro-lH-pyrrolo[2,3-c]pyridine-2-carboxylic acid (Preparation 3, 50mg, 0.25mmol), EDCI (60mg, 0.31mmol) and HOBt monohydrate (40mg, 0.26mmol) in DMF (5mL) was added of 3-amino-3,4-dihydro-lH-[l,5]naphthyridin-2-one dihydrochloride (WO 03/074532, 60mg, 0.25mmol) and DIPEA (186muL, 1.07mmol) and the resulting solution stirred for 12h at rt. After concentration in vacuo the residue was partitioned between THF (5OmL) and carbonate buffer (10OmL, pH 10.5). The layers were separated and the aqueous phase extracted with THF (3x50mL). The combined THF fractions were washed with brine (5OmL), dried (MgSO4), filtered and concentrated. Addition of methanol (~2mL) led to the precipitation of the title compound, which was obtained as an off-white solid after filtration, delta? (ds DMSO): 3.23 (IH, dd), 3.38 (IH, dd), 4.95 (IH, m), 7.25 (3H, m), 7.80 (IH, s), 8.14 (IH, m), 8.61 (IH, s), 9.11 (IH, d), 10.50 (IH, s), 12.37 (IH, br s); m/z (ES+) = 342.03 [M-2HC1+H]+; RT = 2.40 min.

The chemical industry reduces the impact on the environment during synthesis 800401-68-7, I believe this compound will play a more active role in future production and life.

Reference:
Patent; PROSIDION LIMITED; WO2006/59164; (2006); A2;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of 77992-44-0, 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. 77992-44-0, name is (5-Bromopyridin-2-yl)hydrazine. A new synthetic method of this compound is introduced below.

A mixture of 369 mg (1.3 mmol) of the compound from Example 44A, 250 mg (1.3 mmol) of the compound from Example 10A and 46 mg (0.3 mmol) p-toluenesulfonic acid in 5 ml THF is reacted in a single mode microwave (Emrys Optimizer) at 170 C. for 30 min. After addition of 2 ml formic acid to the reaction solution, the solid which has precipitated out is filtered off, stirred with 3 ml of a 4 N solution of hydrogen chloride in dioxane, filtered off again, washed first with acetonitrile and then with diethyl ether and dried in vacuo.Yield: 163 mg (30% of th.)LC-MS (Method 10): Rt=1.06 min; MS (ESIpos): m/z=374 [M+H]+;1H-NMR (400 MHz, DMSO-d6): delta=8.65 (s, 1H), 8.45 (s, 1H), 8.38-8.23 (m, 2H), 8.19 (s, 1H), 8.15 (s, 1H).

At the same time, in my other blogs, there are other synthetic methods of this type of compound,77992-44-0, (5-Bromopyridin-2-yl)hydrazine, and friends who are interested can also refer to it.

Reference:
Patent; BAYER SCHERING PHARMA AKTIENGESELLSCHAFT; US2010/305085; (2010); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

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. 73998-95-5, name is (4,6-Dichloropyridin-3-yl)methanol, molecular formula is C6H5Cl2NO, 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. Quality Control of (4,6-Dichloropyridin-3-yl)methanol

Part II — Synthesis of 4,6-dichloropyridine-3-carbaldehyde [0231] (4,6-Dichloropyridin-3-yl)methanol (4.9 g, 28 mmol) was dissolved in CHC13 (100 mL). Mn02 (24 g, 280 mmol) was then added and the reaction mixture was stirred at 75 C for 12 hours. Next, the reaction was cooled to room temperature, filtered through Celite, and concentrated to give 4,6-dichloropyridine-3-carbaldehyde. Yield 2.9 g (90%>). LCMS (ESI): calc. C6H3C12N0 = 175; obs. M+H = low ionization.

With the rapid development of chemical substances, we look forward to future research findings about 73998-95-5.

Reference:
Patent; MERCK SHARP & DOHME CORP.; LYCERA CORPORATION; AICHER, Thomas; BARR, Kenneth; LAPOINTE, Blair; SIMOV, Vladimir; STEIN, Karin; THOMAS, William; TOOGOOD, Peter; VAN HUIS, Chad; WHITE, Catherine; WO2013/169704; (2013); A2;,
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. 33252-30-1, name is 2-Chloroisonicotinonitrile, the common compound, a new synthetic route is introduced below. Quality Control of 2-Chloroisonicotinonitrile

General procedure: Aromatic or aliphatic nitriles (2 mmol) were dissolved in 5 ml of [bmim]HSO4 and the reaction mixture was heated at 60-65 C for 1-3 h. The progress of reaction was monitored by TLC. After completion of reaction, as checked by TLC, the reaction mixture was poured into water containing crushed ice. The product was precipitated out, filtered and dried. The yield of the final product was high (>90%) in all cases. All final products obtained were found sufficiently pure so it didn?t need further purification.The filtrate was concentrated under vacuum, washed with diethylether twice and concentrated under high vacuum. After proper drying under reduced pressure, approximately 95% ionic liquid was recovered from the reaction and compared with the original ionic liquid to check its authenticity. The efficiency of recovered ionic liquid in conversion of nitriles to acids was found unchanged in comparison to the original one and we reused it up to 5-6 cycles without any significant loss of its activity.

The synthetic route of 33252-30-1 has been constantly updated, and we look forward to future research findings.

Reference:
Article; Kumar, Satyanand; Dixit, Sandeep Kumar; Awasthi, Satish Kumar; Tetrahedron Letters; vol. 55; 28; (2014); p. 3802 – 3804;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 769-28-8, Adding some certain compound to certain chemical reactions, such as: 769-28-8, name is 4,6-Dimethyl-2-oxo-1,2-dihydropyridine-3-carbonitrile,molecular formula is C8H8N2O, 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 769-28-8.

Example 6 3-(5-_ELhLI-2,4-dimgLhyl-6-oxo-1,6-dihydroMidin-3-yl)benzonitrile Step 1: 2-Chloro-3-cyano-4,6-dimethylpyridine: A stirred mixture of 3-cyano-4,6-dimethyl- 2-hydroxypyridine (4.35 g, 29.39 mmol) and phosphorous pentachloride (6.92 g, 33.21 mmol) is heated to 120C. The reaction mixture becomes clear and is stirred for an additional 1 hr. It is then poured onto ice/water (250 mL) and allowed to stand for 30 min. The solution is neutralized with sodium bicarbonate (pH 6) and extracted with dichloromethane (400 mL). The separated organic layer is dried, filtered and concentrated to yield 2-chloro-3-cyano-4,6- dimethylpyridine (4.60 g, 94% yield) as a tan solid containing ca 15% impurity. LC/MS: MS m/e = 167/169 (M + H) ; RT 2.98 min; NMR (CDCl3, 8 ppm) 7.08 (1H, s), 2.57 (3H, s), 2.55 (3H, s).

According to the analysis of related databases, 769-28-8, the application of this compound in the production field has become more and more popular.

Reference:
Patent; AVENTIS PHARMACEUTICALS INC.; WO2005/97750; (2005); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem