Day: September 8, 2021

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. 18438-38-5, name is 2-(Methylthio)pyridine. This compound has unique chemical properties. The synthetic route is as follows. category: pyridine-derivatives

EXAMPLE 7 An aqueous solution consisting of (i) 522.7 g (1.2 mol) of a 27% sodium hypobromite aqueous solution prepared by instilling bromine into a 30% sodium hydroxide aqueous solution and (ii) 8.4 g (0.2 mol) of 95% sodium hydroxide was cooled to 0 C. The 23.8 g of 2-(methylthio)pyridine obtained in Example 6 was instilled into this aqueous solution over 3 hours while keeping the temperature at 0 to 5 C., and stirring was then carried out for 7 hours at 0 to 5 C. The reaction product, which precipitated out as crystals, was filtered, washed with water, and dried, thus obtaining 71.1 g of 2-(tribromomethylsulfonyl)pyridine (purity 99%). The yield relative to the 2-(methylthio)pyridine was 95.0%. The melting point of the 2-(tribromomethylsulfonyl)pyridine obtained was 160 to 161 C.

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, 18438-38-5, 2-(Methylthio)pyridine.

Reference:
Patent; Sumitomo Seika Chemicals Co., Ltd.; US6420564; (2002); B1;,
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. 6311-35-9, name is 6-Bromonicotinic acid. This compound has unique chemical properties. The synthetic route is as follows. name: 6-Bromonicotinic acid

EXAMPLE 31 2-bromo-5-[(2-methylpyrrolidin-1-yl)carbonyl]pyridine The desired product was prepared by substituting 6-bromonicotinic acid for 2-methylnicotinic acid in Example 1. After workup the crude compound was purified by HPLC on C-18 column using a solvent system increasing over 50 minutes in a gradient of 5% to 100% acetonitrile/water containing 0.01% TFA to provide the desired product as the trifluoroacetate salt. MS m/e 268.9 (M+H)+; 1H NMR (DMSO-d6) delta0.86 (d, 0.75H), 1.25 (d, 2.25H), 1.48-1.63 (m, 1H), 1.66-1.80 (m, 1H), 1.81-1.97 (m, 1H), 2.00-2.13 (m, 1H), 3.27-3.37 (m, 0.5H), 3.45-3.54 (m, 1.5H), 3.88-4.00 (m, 0.25H), 4.09-4.21 (m, 0.75H), 7.72 (d, 1H), 7.87 (dd, 1H), 8.52 (d, 1H).

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, 6311-35-9, 6-Bromonicotinic acid.

Reference:
Patent; Haviv, Fortuna; Brandley, Michael F.; Henkin, Jack; US2003/195192; (2003); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 95652-77-0, 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.95652-77-0, name is Methyl 2-chloro-6-methoxynicotinate, molecular formula is C8H8ClNO3, molecular weight is 201.61, as common compound, the synthetic route is as follows.

To a reaction vial containing 7-amino-4-chloro-isoindolin-l-one (365 mg, 2.0 mmol) in dioxane (2.0 mL) was added methyl 2-chloro-6-methoxynicotinate (603 mg, 3.0 mmol), cesium carbonate (1.3 g, 4.0 mmol), copper iodide (152 mg, 80 mmol) and (S,2S)- Nl,N2-dimethylcyclohexane-l,2-diamine (227 mg, 1.6 mmol). The mixture was purged with nitrogen, then warmed to 110 C. The reaction was stirred at 110 C and monitored by LC- MS. Following completion, the reaction was allowed to cool and was then filtered through Celite and rinsed with ethyl acetate. The crude was purified by silica gel chromatography (0- 50% ethyl acetate/hexane) to give the product.

Statistics shows that 95652-77-0 is playing an increasingly important role. we look forward to future research findings about Methyl 2-chloro-6-methoxynicotinate.

Reference:
Patent; CHEMOCENTRYX, INC.; CHEN, Xi; DRAGOLI, Dean, R.; FAN, Junfa; KALISIAK, Jaroslaw; KRASINSKI, Antoni; LELETI, Manmohan, Reddy; MALI, Venkat; MCMAHON, Jeffrey; SINGH, Rajinder; TANAKA, Hiroko; YANG, Ju; YU, Chao; ZHANG, Penglie; (198 pag.)WO2017/87607; (2017); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthetic Route of 1211534-25-6, 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.1211534-25-6, name is 4-Bromo-5-chloro-2-methoxypyridine, molecular formula is C6H5BrClNO, molecular weight is 222.47, as common compound, the synthetic route is as follows.

[00266j 28F. 4-(4-(Qert-Butyldimethylsilyl)oxy)-3 -fluoropiperidin- 1 -yl)-5 -chloro-2- methoxypyridine: A mixture of 28E (194 mg, 0.830 mmol), 27B (185 mg, 0.830 mmol) and SPhos precatalyst (6.0 mg, 8.3 jimol) in THF (1.7 mL) was purged with argon and a 1 M solution of LHMDS in THF (1.0 mL, 1.0 mmol) was added. The reaction mixturewas heated to 70 C for 2 h and then cooled to rt. Sat. aq. NaHCO3 (10 mL) was added slowly to the reaction mixture. The mixture was then extracted with EtOAc (2 x 10 mL) and the combined organic extracts were washed with water (20 mL) and brine (20 mL), dried (Na2504), filtered, and concentrated. Purification by silica chromatography gave 28F (182 mg, 0.490 mmol, 58% yield). LC-MS Anal. Calc?d for C17H28C1FN2O2Si:374.16,found[M+H] 374.9.

The chemical industry reduces the impact on the environment during synthesis 1211534-25-6, I believe this compound will play a more active role in future production and life.

Reference:
Patent; BRISTOL-MYERS SQUIBB COMPANY; ELLSWORTH, Bruce, A.; JURICA, Elizabeth, A.; SHI, Jun; EWING, William, R.; YE, Xiang-Yang; WU, Ximao; ZHU, Yeheng; SUN, Chongqing; WO2014/78609; (2014); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of 17288-32-3, 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 17288-32-3 as follows.

A solution of ethyl 1H-pyrrolo[3,2-b]pyridine-2-carboxylate (23 g, 0.12 mol), 2- bromoethanol (37.9 g, 0.303 mol) and triphenylphosphine (79.4 g, 0.303 mol) intetrahydrofuran was cooled to 0 °C . Diisopropyl azodicarboxylate (61.2 g, 0.303 mol) was added drop-wise over 20 minutes and the resulting mixture was warmed to 25 °C and stirred for 18 hours. After the solvent had been removed under reduced pressure, the residue was diluted with ethyl acetate (300 mL) and extracted with aqueous hydrochloric acid (1 M, 3 x 100 mL). The combined aqueous extracts were basified topH 8 – 9 using saturated aqueous sodium carbonate solution, and the resulting mixture was extracted with ethyl acetate (3 x 100 mL). The combined organic layers were concentrated in vacuo; silica gel chromatography (Eluent: 5:1 petroleum ether I ethyl acetate) provided the product as a white solid. Yield: 25 g, 84 mmol, 70percent. H NMR (400 MHz, CDCI3) oe 8.59 (dd, J=4.5, 1.3 Hz, 1 H), 7.81 (br d, J=8.5 Hz, 1 H), 7.50 (br s, 1 H),7.28 (dd, J=8.5, 4.5 Hz, 1H), 4.92 (t, J=6.7 Hz, 2H), 4.42 (q, J=7.2 Hz, 2H), 3.73 (t, J=6.7 Hz, 2H), 1.44 (t, J=7.2 Hz, 3H).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,17288-32-3, its application will become more common.

Reference:
Patent; PFIZER INC.; CHAPPIE, Thomas Allen; CHANDRASEKARAN, Ramalakshmi Yegna; HELAL, Christopher John; LACHAPELLE, Erik Alphie; PATEL, Nandini Chaturbhai; SCIABOLA, Simone; VERHOEST, Patrick Robert; WAGER, Travis T.; (202 pag.)WO2016/203347; (2016); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of 88511-27-7, Adding some certain compound to certain chemical reactions, such as: 88511-27-7, name is 4-Amino-3-iodopyridine,molecular formula is C5H5IN2, 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 88511-27-7.

General procedure: a suspension of 3-iodo-4-aminopyridine (1 mmol), methyl 2-mercaptoacetate (1.5 equiv), copper (I) iodide (0.05 mmol), trans-N,N’-dimethylcyclohexane-1,2-diamine (0.1 mmol) and cesium carbonate(2 equiv) in dry 1,4-dioxane (4 mL) in a vial was degassed by bubbling N2 into the suspension for 3 min while stirring. The vial was then capped tightly. The mixture was heated at 100 C (oil bath temperature) for 15 h. After coolingto rt, filtration was carried out. The combined filtrates were concentrated on rotavap and the residue was subjected to silica gel column chromatographpurification (5% methanol in methylene chloride) furnishing 3b as a beige solid. 1H NMR (400 MHz, CD3OD) d 8.42 (s, 1H, ArH), 8.26 (s, 1H, ArH), 6.96 (d,J = 5.4 Hz, 1H, ArH), 3.40 (s, 2H, CH2). 13C NMR (400 MHz, CD3OD) d 167.4,148.4, 148.1, 146.0, 29.6.

According to the analysis of related databases, 88511-27-7, the application of this compound in the production field has become more and more popular.

Reference:
Article; Huang, Wei-Sheng; Xu, Rongsong; Dodd, Rory; Shakespeare, William C.; Tetrahedron Letters; vol. 54; 38; (2013); p. 5214 – 5216;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Application of 6937-03-7, Adding some certain compound to certain chemical reactions, such as: 6937-03-7, name is Methyl 2-aminoisonicotinate,molecular formula is C7H8N2O2, 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 6937-03-7.

To a mixture of compound 69.10 (60 g, 394.35 mmol, 1 eq) and DMAP (2.41 g,19.72 mmol, 0.05 eq) in t-BuOH (600 mL) and ACETONE (200 mL) was added Boc20(344.26 g, 1.58 mol, 362.38 mL, 4 eq) dropwise at 18C underN2. The mixture was stirred at 18 C for 15 hours. The solution was diluted with pentane (200 mL), cooled in the refrigerator for 3 hours and filtered to obtain compound 69.9 (42 g, 166.5 mmol, 42% yield) as a white solid. ?H NMR (400 MHz, DMSO-d6) & 1.38 – 1.54 (m, 9 H), 3.82-3.96 (m, 3 H),7.44 (dd, J5.07, 1.41 Hz, 1 H), 8.32 (s, 1 H), 8.42 (d, J5.14 Hz, 1 H) and 10.11 (s, 1 H) ppm.

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. 6937-03-7, Methyl 2-aminoisonicotinate, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; CORTEXYME, INC.; LYNCH, Casey C.; KONRADI, Andrei; GALEMMO, JR., Robert A.; (218 pag.)WO2018/209132; (2018); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 864830-16-0, 5-Bromo-2-fluoro-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, 864830-16-0, blongs to pyridine-derivatives compound. HPLC of Formula: C6H5BrFN

5-Bromo-2-methoxy-4-methylpyridine (B3.1) (0356) Sodium (4.8 g, 0.2 mol) was added to a stirred solution of 80 mL CH3OH portion by portion. After addition, 5-bromo-2-fluoro-4-methylpyridine (7.6 g, 40 mmol) was added subsequently by neat. Then the clear solution was stirred at rt overnight. The reaction was quenched by water (400 mL), extracted with dichloromethane (300 mL×3). The combined organic phase was washed with brine, dried over sodium sulphate, filtered and concentrated to give the title compound (6.95 g, 86%) as a pale yellow solid. 1H NMR (500 MHz, CDCl3) delta 2.31 (s, 3H), 3.87 (s, 3H), 6.61 (s, 1H), 8.15 (s, 1H).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,864830-16-0, its application will become more common.

Reference:
Patent; Novartis AG; CHAN, Ho Man; GU, Xiang-Ju Justin; HUANG, Ying; LI, Ling; MI, Yuan; QI, Wei; SENDZIK, Martin; SUN, Yongfeng; WANG, Long; YU, Zhengtian; ZHANG, Hailong; ZHANG, Ji Yue (Jeff); ZHANG, Man; ZHANG, Qiong; ZHAO, Kehao; (134 pag.)US2016/176882; (2016); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthetic Route of 1034667-22-5, 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 1034667-22-5, name is 5-Fluoro-1H-pyrazolo[3,4-b]pyridin-3-amine. This compound has unique chemical properties. The synthetic route is as follows.

Formation of 3-bromo-5-fluoro-lH-pyrazolo[3,4-A]pyridine (4)To the miture of 5-fluoro-lH-pyrazolo[3,4-6]pyridin-3-amine, 3, (0.88 g, 5.79 mmol) in bromoform (8.8 mL) was added ter/-butyl nitrite ( 1.38 mL, 1 1.57 mmol). This mixture was heated to 61 C for 1 h and then heated to 90 C for an additional hour. The mixture was cooled to room temperature and bromoform was removed under reduced pressure. The resulting crude residue was purified by silica gel chromatography (5-50% ethyl acetate/hexanes) to afford 970 mg of the desired product as a white solid: NMR (300 MHz, DMSO) delta 14.22 (s, 1 H), 8.67 (dd, J = 2.7, 1.9 Hz, 1 H), 8.07 (dd, J = 8.2, 2.7 Hz, 1 H); LC/MS Gradient 10-90%, 0.1 % formic 5min, C 18/ACN, Retention Time = 2.42 min, (M+H) 216.1 1.

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 1034667-22-5, 5-Fluoro-1H-pyrazolo[3,4-b]pyridin-3-amine.

Reference:
Patent; VERTEX PHARMACEUTICALS INCORPORATED; CHARIFSON, Paul, S.; CLARK, Michael, P.; BANDARAGE, Upul, K.; DAVIES, Ioana; DUFFY, John, P.; GAO, Huai; FENG, Jun; LIANG, Jianglin; KENNEDY, Joseph, M.; LEDEBOER, Mark, W.; LEDFORD, Brian; MALTAIS, Francois; PEROLA, Emanuele; WO2012/83117; (2012); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 74115-12-1, 5-Chloro-3-hydroxypyridine, 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-Chloro-3-hydroxypyridine, blongs to pyridine-derivatives compound. Application In Synthesis of 5-Chloro-3-hydroxypyridine

Example 15A 5-Chloro-2-nitropyridin-3-ol With ice cooling, 30 g of 5-chloropyridin-3-ol (232 mmol, 1 equivalent) were dissolved in 228 ml of concentrated sulphuric acid, and, at 0 C., 24 ml of concentrated nitric acid were added slowly. The reaction was warmed to RT and stirred overnight. The mixture was stirred into an ice/water mixture and stirred for another 30 min. The solid was filtered off, washed with cold water and air-dried. This gave 33 g (82% of theory) of the title compound, which were used without further purification for the next reaction. LC-MS (Method 1): Rt=0.60 min MS (ESneg): m/z=172.9/174.9 (M-H)- 1H NMR (400 MHz, DMSO-d6): delta=7.71 (d, 1H); 8.10 (d, 1H); 12.14 (br. 1H).

At the same time, in my other blogs, there are other synthetic methods of this type of compound,74115-12-1, 5-Chloro-3-hydroxypyridine, and friends who are interested can also refer to it.

Reference:
Patent; BAYER PHARMA AKTIENGESELLSCHAFT; VAKALOPOULOS, Alexandros; HARTUNG, Ingo; FOLLMANN, Markus; JAUTELAT, Rolf; STRAUB, Alexander; HAssFELD, Jorma; LINDNER, Niels; SCHNEIDER, Dirk; WUNDER, Frank; STASCH, Johannes-Peter; REDLICH, Gorden; LI, Volkhart Min-Jian; BECKER-PELSTER, Eva Maria; KNORR, Andreas; US2014/128386; (2014); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem