Day: April 18, 2022

Synthetic Route of 1122-61-8, 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. 1122-61-8, name is 4-Nitropyridine, molecular formula is C5H4N2O2, 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.

Weigh accurately 122.5mg of [(p-cymene) RuCl2] 2 and 62.5mg of bpy,Put in a reaction container and mix, and add 10 mL of methanol solution to dissolve the mixture.The reaction was refluxed for 4 h. After the reaction solution was cooled, 10 mL of an AgNO3 (136 mg) aqueous solution was added.Stir overnight at room temperature and filter to obtain the filtrate.To the filtrate was added 5-fold equivalents of 4-nitropyridine, and the reaction was refluxed for 5 h. The above reactions were all performed under the protection of N2.The reaction solution was spin-dried to obtain the crude product as a yellow solid.Separation and purification using a silica gel column. The eluent is a mixture of acetonitrile CH3CN, water H2O, and saturated potassium nitrate KNO3 aqueous solution, and the volume ratio is CH3CN: H2O: KNO3 = 50: 5: 1;The obtained solid was dissolved with a small amount of water, and a saturated aqueous ammonium hexafluorophosphate solution was added to obtain a yellow precipitate.Filtration, the precipitate was washed with a small amount of water, then with a small amount of ether, and dried under vacuum to obtain complex 3. After weighing, calculateThe yield is 36%.

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 1122-61-8, 4-Nitropyridine.

Reference:
Patent; Chongqing Medical University; Chen Yongjie; Liu Shan; Zhao Hua; Ren Jialu; Wang Qian; Du Hui; (13 pag.)CN110256502; (2019); A;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Related Products of 3430-21-5, 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. 3430-21-5, name is 5-Bromo-3-methylpyridin-2-amine, molecular formula is C6H7BrN2, 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.

Sodium nitrite (5.0 g, 72.5 mmol) in water (10 mL) was added dropwise to a cooled (0 C) mixture of 2-amino-5-bromo-3-methylpyridine (5.0 g, 26.7 mmol; Lancaster) in 2.6 M sulfuric acid (70 mL). The mixture was allowed to warm to ambient temperature, stir for 1.5 hours, filtered, and the filtercake was washed with cold water and air dried. The precipitate was dissolved in dichloromethane (100 mL), dried (MgSO4), and concentrated to provide the title compound as a solid (4.2 g, 84%). MS (DCI/NH3) m/z 348 (M+H)+.

According to the analysis of related databases, 3430-21-5, the application of this compound in the production field has become more and more popular.

Reference:
Patent; ABBOTT LABORATORIES; EP1428824; (2004); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Application of 884495-01-6, 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 884495-01-6, name is 4-Bromo-5-fluoro-2-hydroxypyridine. This compound has unique chemical properties. The synthetic route is as follows.

4-Bromo-2-ethoxy-5-fluoro-pyridine 0.20 g (1.04 mmol) 4-bromo-5-fluoro-pyridin-2-ol, 0.83 mL (10.4 mmol) ethyliodide and 0.43 g (1.56 mmol) Ag2CO3 are added to 5 mL DCM and stirred at r.t. over night. The reaction is quenched by the addition of water. DCM is added, the resulting mixture is filtered and the organic layer is separted, dried over MgSO4, filtered again and the solvent is removed in vacuo. C7H7BrFNO (M=220.0 g/mol) ESI-MS: 220/222 [M+H]+Rt(HPLC):1.27 min (method B)

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 884495-01-6, 4-Bromo-5-fluoro-2-hydroxypyridine.

Reference:
Patent; BOEHRINGER INGELHEIM INTERNATIONAL GMBH; FLECK, Martin; HEINE, Niklas; NOSSE, Bernd; ROTH, Gerald Juergen; US2014/213568; (2014); 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.128071-77-2, name is 4-Bromo-2-fluoronicotinaldehyde, molecular formula is C6H3BrFNO, molecular weight is 204, as common compound, the synthetic route is as follows.Safety of 4-Bromo-2-fluoronicotinaldehyde

To a solution of ethyl prop-2-ynoate (2.92 g, 29.8 mmol) in THF (100 mL) at -78 C under N2was added LDA (14.9 mL of a 2M solution in THF/heptane/ethylbenzene, 29.8 mmol) dropwise. The mixture was stirred at -78 C for 20 minutes and a solution of 4-bromo-2-fluoro-pyridine-3-carbaldehyde (5.79 g, 28.38 mmol) in THF was added. The mixture was stirred at -78 C for 1 h and the reaction was quenched by the addition of saturated aqueous NH4C1 (100 mL). The mixture was extracted with EtOAc (3 x 100 mL) and the combined organics were dried over Na2SO4, filtered and concentrated. The residue was purified by silica gel column chromatography to give the title compound (1.47 g, 4.87 mmol, 17% yield) as a red oil. LCMS m/z = 302.0 [M+Hf ?H NMR (400 MHz, CDC13):oe ppm 1.32 (t, J = 7.2 Hz, 3 H), 3.08 (dd, J = 9.2, 2.8 Hz, 1H), 4.26 (q, J = 7.2 Hz, 2H), 6.04 (dd, J =9.1, 1.9 Hz, 1H), 7.49-7.44 (m, 1H), 8.05 (dd, J = 5.3, 0.8 Hz, 1H).

At the same time, in my other blogs, there are other synthetic methods of this type of compound,128071-77-2, 4-Bromo-2-fluoronicotinaldehyde, and friends who are interested can also refer to it.

Reference:
Patent; ARENA PHARMACEUTICALS, INC.; SEMPLE, Graeme; REN, Albert S.; SCHRADER, Thomas O.; KASEM, Michelle; ZHU, Xiuwen; (182 pag.)WO2018/35477; (2018); 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. 6318-51-0, name is (4-Chlorophenyl)(pyridin-2-yl)methanone. A new synthetic method of this compound is introduced below., Quality Control of (4-Chlorophenyl)(pyridin-2-yl)methanone

General procedure: Bioconversion was conducted with 20 mM 1a-10a,20 U·mL-1KpADH variants, 40 mM isopropanol in PBS buffer (pH 7.0,100 mM) in total volume of 2 mL at 30 C and 180 rpm overnight. Then,1 mL of the reaction mixture was withdrawn and extracted with ethylacetate. The organic phase was isolated by centrifugation and driedover anhydrous MgSO4. The conversion rate and enantioselectivity ofthe products were analyzed as described in supporting information.

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, 6318-51-0, (4-Chlorophenyl)(pyridin-2-yl)methanone.

Reference:
Article; Wang, Yue; Dai, Wei; Liu, Yongmei; Zhang, Zhongwei; Zhou, Jieyu; Xu, Guochao; Ni, Ye; Catalysis Communications; vol. 108; (2018); p. 1 – 6;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Related Products of 886365-06-6, 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 886365-06-6, name is Methyl 5-bromo-4-methylpicolinate. This compound has unique chemical properties. The synthetic route is as follows.

5-Bromo-4-methyl-pyridine-2-carboxylic acid (2-hydroxy-ethyl)-amide 5-Bromo-4-methyl-pyridine-2-carboxylic acid (2-hydroxy-ethyl)-amide: To 5-bromo-4-methyl-pyridine-2-carboxylic acid methyl ester (200 mg, 0.869 mmol) and 2-amino-ethanol (265 mg, 4.34 mmol) was added (CH3)3Al (0.6 mg, 0.008 mmol). The mixture was placed in a sealed tube and heated at 100 C. for 1 h, after which the mixture was cooled, quenched with water, and extracted with EtOAc. The organic phase was dried, concentrated, and purified by column chromatograph to give 5-Bromo-4-methyl-pyridine-2-carboxylic acid (2-hydroxy-ethyl)-amide (130 mg, 65%) as an off-white solid.

According to the analysis of related databases, 886365-06-6, the application of this compound in the production field has become more and more popular.

Reference:
Patent; Hoffmann-La Roche Inc.; Alam, Muzaffar; Du Bois, Daisy Jo; Hawley, Ronald Charles; Minatti, Ana Elena; Kennedy-Smith, Joshua; Thakkar, Kshitij Chhabilbhai; Wilhelm, Robert Stephen; US2013/158066; (2013); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 1357947-08-0, 5-Bromo-3-iodo-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, Formula: C6H3BrIN3, blongs to pyridine-derivatives compound. Formula: C6H3BrIN3

The product from Step a (1.18 g, 3.65 mmol) was combined with doubly SEM-protected 1 ,3-dihydro-5-(4,4,5,5-tetramethyl- 1 ,3,2-dioxaborolan-2-yl)-2//-bendimidazol-2- one (1.9 g, 3.65 mmol), and Pd(dppf)Ch (267 mg, 0.365 mmol) in dioxane (36.5 ml). A solution of 1 M aqueous Na2C03 (11.0 ml) was added, and the solution was sparged with nitrogen for one minute. The reaction was sealed and heated to 1 10 C for 15 hours, at which point the reaction was concentrated onto Celite and purified by flash chromatography over silica gel (ethyl acetate/hexanes 0% to 40%). Yield: 247 mg, (12%).

At the same time, in my other blogs, there are other synthetic methods of this type of compound,1357947-08-0, 5-Bromo-3-iodo-1H-pyrazolo[3,4-c]pyridine, and friends who are interested can also refer to it.

Reference:
Patent; ARCUS BIOSCIENCES, INC.; BEATTY, Joel; DEBIEN, Laurent Pierre Paul; DREW, Samuel Lawrie; FOURNIER, Jeremy; GRANGE, Rebecca Louise; JACOB, Steven Donald; JEFFREY, Jenna Leigh; LAWSON, Kenneth V.; LELETI, Manmohan Reddy; LINDSEY, Erick Allen; MANDAL, Debashis; POWERS, Jay Patrick; TRAN, Anh Thu; THOMAS-TRAN, Rhiannon; YAN, Xuelei; (164 pag.)WO2020/46813; (2020); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 7477-10-3, 6-Chloro-5-nitronicotinic acid, 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, 7477-10-3, blongs to pyridine-derivatives compound. Product Details of 7477-10-3

(Trimethylsi.yl)diazomethane (8.25 mL of a 2.00 M solution in hexanes, 16.5 mmol) was added in three portions to a stirred solution of delta-chloro-S-nitronicotinic acid (1.00 g, 4.95 mmol) in methanol (12.0 mL) and DCM (24.0 mL) at 0 °C. The reaction mixture was quenched with TFA and concentrated in vacuo to afford the title compound i-2a . mlz (ES) 217 (MH)+. 1H NMR (500 MHz, CDCl3): delta 9.20 (d, 1H, J= 2.1 Hz), 8.79 ((L IR J= 2.1 Hz), 4.05 (s, 3H).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,7477-10-3, its application will become more common.

Reference:
Patent; MERCK SHARP & DOHME CORP.; CHU, Lin; OGAWA, Anthony; OK, Hyun, O.; UJJAINWALLA, Feroze; WO2010/51245; (2010); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthetic Route of 167837-43-6 ,Some common heterocyclic compound, 167837-43-6, molecular formula is C8H8N2O2, 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 62; Preparation of (El-S-f-aminopyridin-S-v?-N-fCS-fluoro-S-methylbenzofblthiorjhen-?- ylimethvD-N-methylacrylamide hydrochloride;To a solution of (5-fluoro-l-methyl-lH-indol-2-yl)-N-methyhnethanamine (168 mg, 0.8 mmol) in DMF (5 mL) were added in sequential order (E)-3-(6-aminopyridin-3- yi)acrylic acid (120 mg, 0.73 mmol), 1-hydroxybenzotriazole (111 mg, 0.8 mmol), diisopropylethylamine (391 uL, 2.19 mmol), and N-(3-dimethylaminopropyl)-N’- ethylcarbodiimide (160 mg, 0.8 mmol). The mixture was stirred at room temperature overnight, cooled in an ice bath and water added with rapid stirring. The product was extracted with ethyl acetate (3 x 1OmL), dried, filtered and concentrated. The crude free base was re-solvated in methylene chloride (1OmL) to which was added HCl (1 mL, 4M in dioxane), with the product precipitating out with the addition of ether. The title compound is triturated with ether (2 x 10 mL) to yield the product as a pale brown solid (76 mg, 25%): 1HNMR (300 MHz, DMSO-J6) delta 8.2-8.49 (m, 3H), 7.86-7.99 (m, IH), 7.46-7.64 (m, 2H), 7.16-7.29 (m, 2H), 6.99 (d, J= 12.0 Hz, IH), 4.83-5.13 (rotamers, 2s, 2H), 2.95-3.16 (rotamers, 2s, 3H), 2.41 (s, 3H); MS (ESI) m/e 356 (C19H18FN3OS + H)+.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,167837-43-6, its application will become more common.

Reference:
Patent; AFFINIUM PHARMACEUTICALS, INC.; WO2007/53131; (2007); A2;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 851179-01-6, 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.851179-01-6, name is 3-Chloro-2,4-difluoropyridine, molecular formula is C5H2ClF2N, molecular weight is 149.5259, as common compound, the synthetic route is as follows.

A four-necked flask was charged with 2,4-difluoro-3-chloropyridine (29.9 g, 0.20 mol)Ethanol (240 mL),Hydrazine hydrate (80%, 25 g, 0.40 mol) was added dropwise with vigorous stirring,After heating and refluxing for 12 hours,The mixture was poured into 350mL water, analysisThe solid was filtered, washed with ethanol,Vacuum drying gave 18.7 g of 3-chloro-4-fluoro-2-hydrazinopyridine as yellowish solid in 58% yield.

Statistics shows that 851179-01-6 is playing an increasingly important role. we look forward to future research findings about 3-Chloro-2,4-difluoropyridine.

Reference:
Patent; Zhejiang Xin’an Chemical Group Co., Ltd.; Zhu Jianmin; Yu Shenluan; Li Qiaojun; Liu Chunjie; Fan Xiaotang; Jiang Zhe; Xu Yaqing; (19 pag.)CN104557860; (2017); B;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem