Tag: M.W=0-100

Adding a certain compound to certain chemical reactions, such as: 109-08-0, name is 2-Methylpyrazine, belongs to pyrazines compound, 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 109-08-0, Safety of 2-Methylpyrazine

In the glove box,Mn(CO)5Br (0.005mmol), [(E)-2-(2-(1-(2-pyridyl)ethylidene)-indenyl)pyridinium](0.006mmol),Add 1.0 mL of toluene,After stirring for two hours,Add 1a (2mmol),Benzyl alcohol 2b (1mmol),After the reaction at 135 C for 48 hours, the reaction was stopped.Evaporate the solvent,Column chromatography ethyl acetate / petroleum ether (1:10),Trans-disubstituted olefin derivative 3b.The product is a white solid.The yield was 63%.

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, 2-Methylpyrazine, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; Qingdao University of Science and Technology; Zhang Chunyan; (19 pag.)CN108250153; (2018); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – 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. 5049-61-6, name is Pyrazin-2-amine belongs to pyrazines compound, it is a common compound, a new synthetic route is introduced below. SDS of cas: 5049-61-6

Step 1: Synthesis of 5-chloropyrazin-2-amine To a stirred solution of pyrazin-2-amine (3 g, 31.545 mmol) in anhydrous DCM (30 mL) was added NCS (4.2 g, 30.545 mmol) under nitrogen and stirred at 40 C. for 2 h. Progress of reaction was monitored by TLC. After reaction completion DCM was added and washed with water. The organic layer was dried over sodium sulphate and concentrated under reduced pressure. Crude was purified by silica gel (100-200 mesh) column chromatography using 20% ethyl acetate in hexane as eluent to yield 5-chloropyrazin-2-amine (0.59 g, 15%) as yellow solid. MS: 242.08 [M++1]

The synthetic route of 5049-61-6 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Mankind Pharma Ltd.; Patil, Rakesh Ishwar; Verma, Jeevan; Shah, Dharmesh; Ali, Sazid; Bapuram, Srinivasa Reddy; Rai, Santosh Kumar; Kumar, Anil; (146 pag.)US2017/291910; (2017); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Adding a certain compound to certain chemical reactions, such as: 5049-61-6, name is Pyrazin-2-amine, belongs to pyrazines compound, 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 5049-61-6, Safety of Pyrazin-2-amine

Step 1 ethyl imidazo[1,2-c]pyrazine-3-carboxylate Pyrazin-2-amine 4a (1 g, 10 mmol) was dissolved in 50 mL of ethylene glycol dimethyl ether, followed by addition of 50 mL of methanol and 3-bromo-2-oxo-propionate (2.30 g, 12 mmol). After stirring for 4 hours at room temperature, the reaction mixture was cooled to 0 C. and stirred for 30 minutes until a solid precipitated. The reaction mixture was filtered, and the filter cake was washed with ether (10 mL*3). The solid was dissolved in 50 mL of anhydrous ethanol and the solution was refluxed for 4 hours. The reaction mixture was concentrated under reduced pressure, added with 100 mL of dichloromethane, washed successively with saturated sodium carbonate solution (40 mL) and saturated sodium chloride solution (40 mL), dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated under reduced pressure to obtain ethyl imidazo[1,2-a]pyrazine-3-carboxylate 14a (0.55 g, yield 28.9%) as a brown solid. MS m/z (ESI): 192.1 [M+1]

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, Pyrazin-2-amine, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; JIANGSU HANSOH PHARMACEUTICAL CO., LTD.; Tang, Peng Cho; Li, Xin; Li, Xiangqin; Chen, Yang; Wang, Bin; Zhu, Zhe; US2013/131068; (2013); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Adding a certain compound to certain chemical reactions, such as: 109-08-0, name is 2-Methylpyrazine, belongs to pyrazines compound, 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 109-08-0, Application In Synthesis of 2-Methylpyrazine

100L enamel reaction kettle, equipped with material dropping pipe (connected with metering pump), equipped with chlorine gas introduction pipe (connected with chlorine gas automatic control system), automatic pressure control system, temperature detection chain control system. Add 96kg of solvent dichloroethane and 1kg of triethylamine to the reaction kettle and start stirring, then pass chlorine gas, and set the pressure in the kettle to be automatically controlled at 0.02-0.03MPa for 20-30 minutes. Then start feeding with a metering pump at a rate of 5kg/h (according to 10kg of methylpyrazine mixed with 10kg of dichloroethane to be used evenly), the reaction exotherm is obvious, the reaction temperature is controlled at 45 ~ 60 C , the temperature is higher than 60C. The feeding system is automatically cut off at (if necessary, the water flow can be manually controlled to lower the temperature), the beating is completed in about 4 hours, and then the reaction is continued for 30 minutes at a pressure of 0.02 ~ 0.03MPa. Then lower the temperature to 30-40C, introduce the residual chlorine gas in the reaction kettle into the lye spray absorption tower to absorb, the remaining reaction liquid in the kettle is pressed into the dichloroethane turnover tank with nitrogen through the pipeline filter (containing chlorine gas for recycling), the reaction kettle The remaining chloropyrazine hydrochloride solid is dissolved in 30Kg of water first, and then neutralized with 30% alkaline solution to pH 6-7, and then separated into layers to obtain crude chloropyrazine, about 12Kg, content about 92 % Is directly used for the next reaction.

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, 2-Methylpyrazine, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; Shandong Jitian Biological Technology Co., Ltd.; Shandong Jitian Flavors Co., Ltd.; Yang Weixiang; Ren Wei; Yang Liang; Liu Shuzeng; Zhang Hongkui; Zhao Bin; Sun Yicheng; (6 pag.)CN110963974; (2020); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – 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. 109-08-0, name is 2-Methylpyrazine, A new synthetic method of this compound is introduced below., Recommanded Product: 109-08-0

To a solution of methyl picolinate (1.14 g, 1 mL, 8.3 mmol) and 2-methylpyrazine (0.78 g, 0.76 mL, 8.3 mmol) in THF (15 mL) was added NaH (60% in mineral oil, 0.5 g, 12 mmol). The mixture was refluxed for 16 h. Once cooled to room temperature, the mixture was poured into saturated aqueous solution of NH4CI (30 mL) and extracted with EtOAc (3 x 30 mL). Organic fractions were combined, washed with brine (30 mL), dried over MgS04, and the solvent was evaporated in vacuo. The product, purified by column flash chromatography (CTHC^MeOH; 10: 1 to 5: 1), was obtained as a yellow solid (1.3 g, 80 %). (‘ 11 NMR shows a mixture of the keto- and enol- forms in ratio ca. 1 : 1) (0265) NMR (500 MHz, CDC13) (ppm) 13.65 (s, 1H), 8.71 (ddd, / = 0.9, 1.8, 4.8 Hz, 1H), 8.67 – 8.64 (m, 2H), 8.58 (d, J = 1.1 Hz, 1H), 8.52 (dd, J = 1.6, 2.6 Hz, 1H), 8.46 (d, J = 2.6 Hz, 1H), 8.36 – 8.31 (m, 2H), 8.12 – 8.05 (m, 1H), 8.00 – 7.94 (m, 1H), 7.88 – 7.83 (m, 1H), 7.83 – 7.77 (m, 1H), 7.50 (ddd, J = (0266) 1.2, 4.7, 7.5 Hz, 1H), 7.32 (ddd, / = 1.2, 4.7, 7.5 Hz, 1H), 6.94 (s, 1H), 4.80 (s, 2H); (0267) 13C NMR (126 MHz, CDC13) d (ppm) 197.7, 162.0, 154.2, 152.9, 152.6, 152.1, 149.3, 149.3, 146.3, (0268) 145.2, 144.4, 142.9, 140.2, 140.0, 137.2, 137.2, 127.7, 124.4, 122.5, 120.5, 94.2, 44.5; (0269) HRMS calcd for C11H10N3O [M+H]+ 200.0818, found 200.0816.

The basis of chemical reaction formula synthesis, the synthesis route is composed of some specific reactions and combined according to certain logical thinking. We look forward to the emergence of more reaction modes in the future.

Reference:
Patent; MASARYKOVA UNIVERZITA; PARUCH, Kamil; CARBAIN, Benoit; HAVEL, Stepan; DAMBORSKY, Jiri; BREZOVSKY, Jan; DANIEL, Lukas; SISAKOVA, Alexandra; NIKULENKOV, Fedor; KREJCI, Lumir; (190 pag.)WO2019/201865; (2019); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – 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. 6270-63-9, name is Pyrazin-2(1H)-one, A new synthetic method of this compound is introduced below., Formula: C4H4N2O

General procedure: The appropriate nucleophile (1 equiv.), the epoxide (1-3 equiv.) and a base (1-5 equiv.) were suspended in a solvent and the reaction mixture was heated under the stated conditions. (0735) The reaction was allowed to cool to rt, saturated NH4CI(aq) or water was added and the resulting mixture was extracted using DCM or EtOAc (x 3). The combined organic extracts were dried (phase separator or MgS04), concentrated under reduced pressure and the remaining residue was purified by flash chromatography to give the product.

The basis of chemical reaction formula synthesis, the synthesis route is composed of some specific reactions and combined according to certain logical thinking. We look forward to the emergence of more reaction modes in the future.

Reference:
Patent; ALMAC DISCOVERY LIMITED; ROUNTREE, James Samuel Shane; WHITEHEAD, Steven Kristopher; TREDER, Adam Piotr; PROCTOR, Lauren Emma; SHEPHERD, Steven David; BURKAMP, Frank; COSTA, Joana Rita Castro; O’DOWD, Colin; HARRISON, Timonthy; (333 pag.)WO2019/150119; (2019); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – 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. 5049-61-6, name is Pyrazin-2-amine, This compound has unique chemical properties. The synthetic route is as follows., Product Details of 5049-61-6

Pyrazin-2-amine 4a (1 g, 10 mmol) was dissolved in 50 mL of ethylene glycol dimethyl ether, followed by addition of 50 mL of methanol and 3-bromo-2-oxo-propionate (2.30 g, 12 mmol). After stirring for 4 hours at room temperature, the reaction mixture was cooled to 0 C and stirred for 30 minutes until a solid precipitated. The reaction mixture was filtered, and the filter cake was washed with ether (10 mLx3). The solid was dissolved in 50 mL of anhydrous ethanol and the solution was refluxed for 4 hours. The reaction mixture was concentrated under reduced pressure, added with 100 mL of dichloromethane, washed successively with saturated sodium carbonate solution (40 mL) and saturated sodium chloride solution (40 mL), dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated under reduced pressure to obtain ethyl imidazo[1,2-a]pyrazine-3-carboxylate 14a (0.55 g, yield 28.9%) as a brown solid. MS m/z (ESI): 192.1 [M+1]

Chemical properties determine the actual use. Each compound has specific chemical properties and uses. We look forward to more synthetic routes in the future to expand reaction routes of 5049-61-6.

Reference:
Patent; Jiangsu Hansoh Pharmaceutical Co., Ltd.; TANG, Pengcho; LI, Xin; LI, Xiangqin; CHEN, Yang; WANG, Bin; ZHU, Zhe; EP2604610; (2013); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Reference of 109-08-0, These common heterocyclic compound, 109-08-0, name is 2-Methylpyrazine, 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 2.5 M hexanes solution of n-BuLi (18.0 mL, 45 mmol) was added to a -78 °C THF solution (60 mL) of ^-BuOK (5.1 g, 45 mmol) and diisopropylamine (6.3 mL, 45 mmol). After 5 min at -78 °C the yellow mixture was warmed to -40 °C. Neat methylpyrazine (2.7 mL, 30 mmol) was added and the mixture rapidly turned dark red. After 30 min at -40 °C the mixture was cooled to -78 °C and neat allyl bromide (7.6 mL, 90 mmol) was added. After 30 min at -78 °C water was added and the mixture was partially concentrated to remove volatile organics. The resulting mixture was extracted with dichloromethane and the combined organics were dried (Na2SO4), concentrated, and purified via column chromatography to give 2.2 g of 2-but-3-enyl-pyrazine.

The synthetic route of 109-08-0 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; JANSSEN PHARMACEUTICA NV; BARBAY, J., Kent; LEONARD, Kristi; CHAKRAVARTY, Devraj; SHOOK, Brian, Christopher; WANG, Aihua; WO2010/45012; (2010); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Related Products of 4949-13-7, 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 4949-13-7 as follows.

STEP 1. 2-FLUORO-3-IODOPYRAZINE Butyl lithium solution (2.5 M in hexane, 881 mL, 2.01 mol) and 1.5 L of dry THF were charged into a flame-dried 5.0 L round-bottomed flask. The flask was cooled to -50 C. and 2,2,6,6-tetramethylpiperidine (312.0 mL, 2.20 mol) was added dropwise. The reaction mixture was warmed to 0 C. without taking the cold bath away and kept at that temperature for 20 min. The reaction was then cooled to -78 C., and 2-fluoropyrazine (180 g, 1.84 mol) in 150 mL of THF was added dropwise. The mixture was kept at -78 C. for 5 min. Iodine (464 g, 1.84 mol) in 500 mL of THF was added dropwise and the reaction mixture was kept at -78 C. for 1 h. The reaction was quenched with the addition of 250 mL of concentrated HCl, 250 mL MeOH and 250 mL THF at -78 C. The cold bath was then removed, and aqueous sodium bisulfite was added to get rid of traces of unreacted iodine. The solvent was then evaporated and the residue was diluted with water and adjusted to pH 8. The mixture was extracted with ethyl acetate (3*1.5 L). Combined ethyl acetate layer was dried over sodium sulfate and concentrated. The crude product was purified by column chromatography (Silica:100-200 mess, solvent: 10% EtOAc/hexanes) to give the title compound as a white solid.

According to the analysis of related databases, 4949-13-7, the application of this compound in the production field has become more and more popular.

Reference:
Patent; AMGEN INC.; US2010/160280; (2010); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – 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. 6270-63-9, name is Pyrazin-2(1H)-one, This compound has unique chemical properties. The synthetic route is as follows., category: Pyrazines

Example 181; (1SR,2RS)-1-methyl-cyclopropane-1,2-dicarboxylic acid 2-[(5-chloro-pyridin-2-yl)-amide]1-{[2-fluoro-4-(2-oxo-pyrazin-1-yl)-phenyl]-amide}; In analogy to example 178, step 3, (1SR,2RS)-2-(5-chloro-pyridin-2-ylcarbamoyl)-1-methyl-cyclopropanecarboxylic acid methyl ester (example 178, step 2) was reacted with 1-(4-amino-3-fluoro-phenyl)-1H-pyrazin-2-one (prepared from 2-fluoro-4-iodoaniline by reaction with 1H-pyrazin-2-one, Cu(I)I, N,N’-dimethylethylenediamine and cesium carbonate in dioxane at 120 C.) to give (I SR,2RS)-1-methyl-cyclopropane-1,2-dicarboxylic acid 2-[(5-chloro-pyridin-2-yl)-amide]1-{[2-fluoro-4-(2-oxo-pyrazin-1-yl)-phenyl]-amide} as off-white solid. MS 440.3 ([M-H]-).

According to the analysis of related databases, 6270-63-9, the application of this compound in the production field has become more and more popular.

Reference:
Patent; Boehringer, Markus; Zbinden, Katrin Groebke; Haap, Wolfgang; Hilpert, Hans; Himber, Jacques; Humm, Roland; Iding, Hans; Knopp, Dietmar; Panday, Narendra; Ricklin, Fabienne; Stahl, Christoph Martin; US2006/106016; (2006); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem