Pyridine-derivatives

Synthetic Route of 128071-98-7 ,Some common heterocyclic compound, 128071-98-7, molecular formula is C5H3BrFN, 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.

A mixture of 4-bromo-2-fluoropyridine (0.635 g), Pd2(dba)3 (catalytic quantity), Xantphos (catalytic quantity) and Cs2CO3 (1.5 g) in 1,4-dioxane (5ml) was degassed by applying alternating N2 atmosphere and vacuum. Intermediate (132) in 1,4-dioxane (15ml) was added under N2-atmosphere. The reaction mixture was stirred at 1000C for 2 hours. The reaction mixture was filtrated. After extraction (DCM/water), the collected organic layers were dried (MgSO4), filtered and the filtrate was evaporated. The residue was purified by HPLC (HPLC method A). Two product fraction groups were collected and their solvents were evaporated, yielding intermediate (133) (trans; relative; mixture) and intermediate (134) (cis; relative; mixture).

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. 128071-98-7, 4-Bromo-2-fluoropyridine, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; JANSSEN PHARMACEUTICA NV; WO2008/3665; (2008); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of 116632-24-7, 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 116632-24-7, name is 2-Amino-4,6-dichloropyridine. This compound has unique chemical properties. The synthetic route is as follows.

2,4-Dichloro-6-hydroxypyridine; Sodium nitrite (64 mg, 0.93 mmol) dissolved in water (0.6 mL), was added dropwise to a stirred solution of 2-amino-4,6-dichloropyridine (prepared according to the method described in Recl. Trav. Chim. Pays-Bas, 1950, 69, 673) (126 mg, 0.77 mmol) in 5% sulphuric acid (aq) (5 mL) at 0 C., over 5 min. The mixture was stirred at 0 C. for 1 h and then diluted with water (20 mL) and extracted with DCM (3×20 mL). The combined extracts were washed with brine (20 mL), dried over MgSO4 and concentrated in vacuo to afford the 2,4-dichloro-6-hydroxypyridine (116 mg, 0.71 mmol, 92%) M.S. (ESI) (m/z) 164,166 [M+H]+.

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 116632-24-7, 2-Amino-4,6-dichloropyridine.

Reference:
Patent; N.V. Organon; US2007/185156; (2007); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthetic Route of 17228-69-2 ,Some common heterocyclic compound, 17228-69-2, molecular formula is C6H6ClNO, 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.

General procedure: Under an N2 atmosphere, KOtBu (1.3 mmol), complex 1 (1 mol %), dioxane (2 ml), amines (1.3 mmol) and aryl chlorides (1.0 mmol) were successively added into a Schlenk tube. The mixture was stirred vigorously at 90 C for 4 h. Then the solvent was removed under reduced pressure and the residue was purified by column chromatography on silica gel (eluent: PE/EA = 15:1) to give the pure products. The reported yields are the average of two runs.

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. 17228-69-2, 2-Chloro-4-methoxypyridine, other downstream synthetic routes, hurry up and to see.

Reference:
Article; Nirmala, Muthukumaran; Saranya, Gandhi; Viswanathamurthi, Periasamy; Bertani, Roberta; Sgarbossa, Paolo; Malecki, Jan Grzegorz; Journal of Organometallic Chemistry; vol. 831; (2017); p. 1 – 10;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of 89570-82-1, 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. 89570-82-1, name is 3-Chloro-2-hydrazinyl-5-(trifluoromethyl)pyridine. A new synthetic method of this compound is introduced below.

Formula () 3- chloro-2-hydrazino-5-trifluoromethyl-pyridine (211mg, 1mmol) shown in ethanol (10ml), acetic acid (0.1mmol), 2- fluorobenzaldehyde (1 mmol of) mixing, Join CEM pressure tank, and then in the microwave synthesizer (150W, 85 , 200psi, 15minutes) under the conditions of work, after the completion of the microwave instrument through which compressed air is cooled to room temperature, filtration, and recrystallized from ethanol to obtain the objective compound of formula (-1) shown chloro-2- (2- (2-fluorophenyl) hydrazine-yl) -5-trifluoromethyl-pyridine, yield 71%.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,89570-82-1, its application will become more common.

Reference:
Patent; Zhejiang University Of Technology; Zhao, Wen; Di, Zhiwen; Yang, Mingyan; Sun, Zhaohui; Liu, Xinghai; Min, Lijing; Shi, Yanxian; Weng, Jianquan; Tan, Chengxia; Li, Baoju; (12 pag.)CN105541706; (2016); A;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Related Products of 126954-66-3, 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. 126954-66-3, name is 2,5-Dichloronicotinonitrile. A new synthetic method of this compound is introduced below.

To a solution of 2,5-dichloronicotinonitrile (160 mg, 0.92 mmol) in n-butanol (15.0 mL) was added hydrazine hydrate (0.4 mL, 15 mmol). The mixture was stirred at 120 C for 7 h. The reaction mixture was concentrated in vacuo to remove the solvent, and the residue was purified by silica gel column chromatography (PE/EtOAc (v/v) = 4/1) to give the title compound as a white solid (86 mg, 55 %).MS (ESI, pos. ion) m/z: 169.0 [M+H]?H NIVIR (400 MHz, CDC13) (ppm): 8.33 (s, 1H), 8.29 (s, 1H), 5.69 (s, 2H).

At the same time, in my other blogs, there are other synthetic methods of this type of compound,126954-66-3, 2,5-Dichloronicotinonitrile, and friends who are interested can also refer to it.

Reference:
Patent; SUNSHINE LAKE PHARMA CO., LTD.; REN, Qingyun; TANG, Changhua; YIN, Junjun; YI, Kai; LEI, Yibo; WANG, Yejun; ZHANG, Yingjun; (215 pag.)WO2018/127096; (2018); 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. 1209459-88-0, name is 4-Bromo-N-methylpicolinamide, the common compound, a new synthetic route is introduced below. COA of Formula: C7H7BrN2O

Step 2. Methyl l-(4-(2-(methylcarbamoyl)pyridin-4-yl)phenyl)cyclobutane-l- carboxylate: Into a 20 mL microwave vial equipped with a magnetic stir bar and under N2 were added 4-bromo-N-methyl-pyridine-2-carboxamide (204mg, 948.77 muiotatauiotaomicron), methyl l-[4-(4,4,5,5- tetramethyl-l,3,2-dioxaborolan-2-yl)phenyl]cyclobutanecarboxylate (300 mg, 948.77 mupiiotaomicron), tetrakis(triphenylphosphine)palladium(0) (109mg, 94.88 mupiiotaomicron), potassium carbonate (393 mg, 2.85 mmol), MeOH (3 mL) and DMF (6 mL). The vial was sealed and the suspension degassed with nitrogen for 10 minutes and the mixture was heated to 150 C for 10 minutes. The mixture was purified by column chromatography through silica gel eluting with 100:0 to 0: 100 hexanes:EtOAc as a gradient over 25 minutes. The desired fractions were combined, concentrated and further dried under high vacuum O/N to provide a yellow solid (250 mg). LCMS (ESI+) m/z = 325 (M+l).

The synthetic route of 1209459-88-0 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; TEMPEST THERAPEUTICS, INC.; POWELL, David Andrew; ROPPE, Jeffrey Roger; SEIDERS, Thomas Jon; DING, Jinyue; SHENG, Tao; JACINTHO, Jason Duarte; (65 pag.)WO2019/79614; (2019); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Related Products of 669066-91-5, Adding some certain compound to certain chemical reactions, such as: 669066-91-5, name is 5-Bromo-3-fluoropicolinic acid,molecular formula is C6H3BrFNO2, 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 669066-91-5.

N,N-Diisopropylethylamine (200 mu, 1 mmol) was added to a mixture of 2- methylbiphenyl-3-amine (70 mg, 0.4 mmol), 5-(methoxycarbonyl)pyridine-2-carboxylic acid (Oakwood Chemical, cat017196, 75 mg, 0.42 mmol), and N,N,N’,N’-tetramethyl-0-(7- azabenzotriazol-l -yl)uronium hexafluorophosphate (220 mg, 0.57 mmol) in N,N- dimethylformamide (2 mL, 20 mmol). The reaction mixture was allowed to stir at room temperature (rt) overnight. The reaction mixture was quenched with saturated aqueous NaHCC , and extracted with ethyl acetate (3 x 20 mL). The combined organic layers were washed with brine, dried over MgSCn, filtered and concentrated under reduced pressure. The residue was purified by flash chromatography on a silica gel column with ethyl acetate in hexanes (0-35%) to afford the desired product. LC-MS calculated for C21H19N2O3 (M+H)+: m/z = 347.1 ; found 347.1. This compound was prepared using a similar procedure as described for Example 1, Step 2, with 5-bromo-3-fluoropyridine-2-carboxylic acid (Aldrich, cat753483) replacing 5- (methoxycarbonyl)pyridine-2-carboxylic acid and prolong the reaction time to 3 days. LC-MS calculated for C19H15BrFN2O (M+H)+: m/z = 385.0; found 385.0.

According to the analysis of related databases, 669066-91-5, the application of this compound in the production field has become more and more popular.

Reference:
Patent; INCYTE CORPORATION; WU, Liangxing; YU, Zhiyong; ZHANG, Fenglei; YAO, Wenqing; (173 pag.)WO2017/106634; (2017); 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.58584-86-4, name is Ethyl 2,6-dichloronicotinate, molecular formula is C8H7Cl2NO2, molecular weight is 220.05, as common compound, the synthetic route is as follows.Formula: C8H7Cl2NO2

3-[(2,2-Difluoro-1-methyl-cyclopropyl)methoxy]-1H-pyrazole (490 mg, 2.604 mmol) was dissolved in DMF (5 mL). Ethyl 2,6-dichloropyridine-3-carboxylate (approximately 573.0 mg, 2.604 mmol) was added followed by 1,4-diazabicyclo[2.2.2]octane(approximately 58.42 mg, 0.5208 mmol) and finely ground potassium carbonate (approximately 539.8 mg, 3.906 mmol). The reaction mixture was allowed to stir overnight at room temperature. The reaction mixture was diluted with water (50 mL) and extracted with EtOAc (2× 50 mL). The combined organic layers were then washed with brine (1× 75 mL), dried over sodium sulfate, filtered, and concentrated under reduced pressure. The crude product was isolated by silica gel column chromatography eluting with a 0-20% EtOAc/hexane gradient on a 40 gram silica gel column. Ethyl 2- chloro-6-[3-[(2,2-difluoro-1-methyl-cyclopropyl)methoxy]pyrazol-1-yl]pyridine-3- carboxylate (797 mg, 82%) was obtained as a white solid.1H NMR (400 MHz, DMSO- d6) delta 8.46 (dd, J = 2.8, 0.9 Hz, 1H), 8.41 (dd, J = 8.4, 0.9 Hz, 1H), 7.75 (dd, J = 8.5, 0.9 Hz, 1H), 6.27 (dd, J = 2.9, 0.9 Hz, 1H), 4.44 – 4.37 (m, 1H), 4.37 – 4.31 (m, 2H), 4.17 (d, J = 10.8 Hz, 1H), 1.67 (q, J = 8.9 Hz, 1H), 1.42 (q, J = 8.4 Hz, 1H), 1.38 – 1.30 (m, 6H). ESI-MS m/z calc.371.08484, found 372.0 (M+1)+; Retention time: 2.09 minutes.

At the same time, in my other blogs, there are other synthetic methods of this type of compound,58584-86-4, Ethyl 2,6-dichloronicotinate, and friends who are interested can also refer to it.

Reference:
Patent; VERTEX PHARMACEUTICALS INCORPORATED; ABELA, Alexander, Russell; ALCACIO, Timothy; ANDERSON, Corey; ANGELL, Paul, Timothy; BAEK, Minson; CLEMENS, Jeremy, J.; CLEVELAND, Thomas; FERRIS, Lori, Ann; GROOTENHUIS, Peter Diederik, Jan; GROSS, Raymond, Stanley; GULEVICH, Anton; HADIDA RUAH, Sara, Sabina; HSIA, Clara, Kuang-Ju; HUGHES, Robert, M.; JOSHI, Pramod, Virupax; KANG, Ping; KESHAVARZ-SHOKRI, Ali; KHATUYA, Haripada; KRENITSKY, Paul, John; MCCARTNEY, Jason; MILLER, Mark, Thomas; PARASELLI, Prasuna; PIERRE, Fabrice Jean, Denis; SHI, Yi; SHRESTHA, Muna; SIESEL, David, Andrew; STAVROPOULOS, Kathy; TERMIN, Andreas, P.; UY, Johnny; VAN GOOR, Fredrick, F.; YOUNG, Tomothy, John; ZHOU, Jinglan; (398 pag.)WO2018/107100; (2018); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthetic Route of 119285-07-3, Adding some certain compound to certain chemical reactions, such as: 119285-07-3, name is tert-Butyl 4-(5-aminopyridin-2-yl)piperazine-1-carboxylate,molecular formula is C14H22N4O2, 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 119285-07-3.

To a solution of 2- (PIPERAZINE-N-T-BUTOXYCARBONYL)-5-AMINO pyridine (70 g, 0.251798 moles) dissolved in acetone (700 ml), sodium bicarbonate (42.3 g, 0.503597 moles) dissolved in water (350 ml), was added and cooled to 0 oC. BENZYLCHLOROFORMATE (85.8 g, 0.503597 moles) was added to the reaction mixture at 0 oC dropwise. After complete addition, the reaction mixture was kept at room temperature for 12 hours. Acetone was removed from the reaction mixture and diluted further with ethylacetate (2L). Washed the ethylacetate layer with water and brine solution. Dried over anhydrous sodium sulphate and concentrated to dryness. The crude compound was crystallized using ethylacetate and hexane to yield the title compound (67.4 g, yield 65 %).

According to the analysis of related databases, 119285-07-3, the application of this compound in the production field has become more and more popular.

Reference:
Patent; ORCHID CHEMICALS AND PHARMACEUTICALS LTD.; WO2005/3087; (2005); A2;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 146679-66-5, 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.146679-66-5, name is 3-Bromo-4-pyridinemethanol, molecular formula is C6H6BrNO, molecular weight is 188.02, as common compound, the synthetic route is as follows.

To a solution of 3bromo-4-(hydroxymethyl)pyridine 4 (1.593 g, 8.47 mmol) in dichioromethane (20 mL) was added imidazole (0.692 g, 10.17 mmol) and tert-butyldimethylsilyl chloride (1.534 g, 10.17 mmol) at 0C and the reaction mixture was stirred for 18 h at ft. The solution was extractedwith DCM and the organic phase was washed with brine, dried and concentrated under vacuum. Purification by silica gel column chromatography using EtOAc/DCM (1/9) as eluent gave j (2.518 g, 98 %).?H NMR (CDC13, 300 MHz, 298 K, 6 ppm): 8.60 (s, 1 H), 8.52 (d, IH, J 4.8 Hz), 7.52 (d, 1H, J= 4.8 Hz), 4.71 (s, 2 H), 0.97 (s, 9 H), 0.15 (s, 6H).13C NMR (CDC13, 75.5 MHz, 298K, 8 ppm): 150.90, 149.67, 148.54, 122.19, 119.20, 63.78, 25.96,18,43, 5.31.GC/MS (m/z): [M-t-Butyl] 244. IR (KBr, v, cm?): 3046, 2953, 2887, 2857, 2709, 1926, 1789, 1737, 1587, 1472, 1445, 1397, 1373, 1360, 1261, 1172, 1114, 1079, 839, 778, 706, 673.

The chemical industry reduces the impact on the environment during synthesis 146679-66-5, I believe this compound will play a more active role in future production and life.

Reference:
Patent; INSA (INSTITUT NATIONAL DES SCIENCES APPLIQUEES) DE ROUEN; CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS); UNIVERSITE DE ROUEN; VFP THERAPIES; MARSAIS, Francis; LEVACHER, Vincent; PAPAMICAEL, Cyril; BOHN, Pierre; PEAUGER, Ludovic; GEMBUS, Vincent; LE FUR, Nicolas; DUMARTIN-LEPINE, Marie-Laurence; WO2014/114742; (2014); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem