Category: 5049-61-6

Application of 5049-61-6, 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 5049-61-6 as follows.

A mixture of 2-aminopyrazin (25 g, 262.9 mmole), chloroacetaldehyde (50% in water, 50 ml, 394 mmole) and NaHCO3 (33.1 g, 394 mmole) was heated for 2 days at 100 C. The reaction mixture was then cooled to RT, satd. K2CO3 solution (100 ml) was added, and the mixture was washed with DCM. The organic phase was dried over Na2SO4 and then concentrated by evaporation to dryness. Purification was carried out by column chromatography on silica gel (DCM/methanol, 95:5+5% NH4OH [35%].

According to the analysis of related databases, 5049-61-6, the application of this compound in the production field has become more and more popular.

Reference:
Patent; GRUENENTHAL GmbH; US2009/186899; (2009); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Reference of 5049-61-6, These common heterocyclic compound, 5049-61-6, name is Pyrazin-2-amine, 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.

Stage preparation of imidazo[1,2-a]pyrazine A mixture of 34 g (0.2 mol) of bromoacetaldehyde dimethyl acetal, 6,6 ml of concentrated aqueous HBr solution and 28 ml of distilled water is brought to reflux for one hour. After reaction, the mixture is alkalinized and extracted with ether. This organic phase is added to a solution of 19 g (0.2 mol) of aminopyrazine in 50 ml of dimethylformamide (DMF). The ether is removed by distillation and the mixture is maintained with stirring and under a stream of nitrogen for 12 hours. After reaction, the DMF is distilled off; the reaction medium is dissolved in 150 ml of anhydrous ethanol, and then brought to reflux for one hour. The alcohol is then removed by distillation; the residue is dissolved in water, alkalinized with Na2 CO3 and extracted using dichloromethane. After chromatography on a neutral alumina column (eluant =anhydrous ether), 10.7 g (Yld=45%) of imidazo[1,2-a]pyrazine (m.p. 84 C.). are obtained.

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

Reference:
Patent; l’Universite de Montpellier I; US5028605; (1991); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Reference of 5049-61-6, These common heterocyclic compound, 5049-61-6, name is Pyrazin-2-amine, 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.

Sodium nitrite (3.4 g, 50 mmol, 1.3 eq.) was added in small portionsto 98% sulfuric acid (15 mL) ice bath, and the mixture was allowed towarm up and heated to 60. When getting clear, the solution wascooled in an ice bath again. A solution of 2-amino-pyrazine (9) (4 g,39.3 mmol, 1 eq.) in 98% sulfuric acid (15 mL) was added dropwise.The reaction mixture was stirred at 40 for 1 h. After cooling to roomtemperature, it was slowly poured onto crushed ice and stirred until nonitrogen run out. The solution was adjusted to pH 6 with a 40% solutionof sodium hydroxide, resulting in lots of sodium sulfate which wasfiltered off whereafter. The filtrate was extracted with EA (50 mL¡Á3),and the combined organics were dried (Na2SO4), filtered and concentratedin vacuo to give the product as a white precipitate (6.38 g,53%).

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

Reference:
Article; Guo, Shuang; Xu, Mingshuo; Guo, Qi; Zhu, Fuqiang; Jiang, Xiangrui; Xie, Yuanchao; Shen, Jingshan; Bioorganic and Medicinal Chemistry; vol. 27; 5; (2019); p. 748 – 759;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Related Products of 5049-61-6, The chemical industry reduces the impact on the environment during synthesis 5049-61-6, name is Pyrazin-2-amine, I believe this compound will play a more active role in future production and life.

5, 6 , 7 , 8-tetrahydroimidazo [1, 2-a] pyrazine A29Stage 1. was added to a mixture of 2-aminopyrazin (25 g, 262.9 mmole), chloroacetaldehyde (50% in water, 50 ml, 394 mmole) and NaHCO3 (33.1 g, 394 mmole) and heated for 2 days at 1000C. The reaction mixture was then cooled to RT, saturated K2CO3 solution (100 ml) was added, and the mixture was washed with DCM. The organic phase was dried over sodium sulfate and then concentrated by evaporation to dryness . Purification was carried out by column chromatography on silica gel (DCM / methanol, 95:5 + 5% NH4OH [35%] .

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; GRUeNENTHAL GMBH; WO2009/90055; (2009); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Electric Literature of 5049-61-6,Some common heterocyclic compound, 5049-61-6, name is Pyrazin-2-amine, molecular formula is C4H5N3, 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.

Initial attempt showed that the reaction gave a lot of black polymers after a few min., with the main product being 3,5-dichloro-2-amino pyrazine. Only small amount of 5- chloro-2-aminopyrazine was isolated (eq 7). This reaction could not be scaled up because it was not reproducible.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route Pyrazin-2-amine, its application will become more common.

Reference:
Patent; THE GOVERNMENT OF THE UNITED STATES, as represented by the secretary of HEALTH AND HUMAN SERVICES; WO2007/124345; (2007); A2;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Synthetic Route of 5049-61-6,Some common heterocyclic compound, 5049-61-6, name is Pyrazin-2-amine, molecular formula is C4H5N3, 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 2-aminopyrazine (25 g, 262.9 mmol) and chloroacetaldehyde (50% solution in water, 50 ml, 394 mmol) was heated for 2 d at 100 C. in the presence of sodium hydrogen carbonate (33.1 g, 394 mmol). The reaction mixture was cooled to room temperature, and saturated potassium carbonate solution (100 ml) was added thereto. Extraction with dichloromethane was then carried out, and the organic phase was dried (Na2SO4) and concentrated. Purification was carried out by column chromatography (dichloromethane/methanol 95:5+5% NH4OH [35%]). Yield: 7.6 g (24%)

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

Reference:
Patent; Gruenenthal GmbH; US2008/153843; (2008); 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, Product Details of 5049-61-6

At room temperature,2-aminopyrazine (8.00 g, 84.12 mmol) was dissolved in dimethylsulfoxide (160 mL)Add water (4 mL),Ice bath,N-bromosuccinimide (31.50 g, 177.00 mmol) was added portionwise to the reaction solution over 30 min,Feeding is completed,Stirred at room temperature overnight,Add water (500mL) quenching,Ethyl acetate (500 mL x 3)Dried over anhydrous Na2SO4,The solvent was removed and the residue was subjected to column chromatography (eluent: PE / EtOAc (v / v) = 6/1) to give 16.40 g of light yellow Color solid, yield: 76.6%.

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

Reference:
Patent; Guangdong East Sunshine Pharmaceutical Co., Ltd; Liu, Bing; Huang, Jiuzhong; Zhang, Yingjun; Xue, Yaping; Xing, Wei; Xu, Juan; Wu, Zuping; Yu, Tianxi; (106 pag.)CN106432246; (2017); 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. 5049-61-6, name is Pyrazin-2-amine, A new synthetic method of this compound is introduced below., Quality Control of Pyrazin-2-amine

2-Aminopyrazine (0.50 g, 5.26 mmol) was dissolved in THF (50 mL), and N-chlorosuccinimide (1.62 g, 12.1 mmol) was added to the solution with stirring. The mixture was refluxed at 100 C for 10 h. After cooling, solvent was evaporated. The residue was directly purified by column chromatography. Finally, the obtained product was washed with pentane/diethyl ether (5:1) to 2-Amino-3,5-dichloropyrazine 1b (492 mg, 57%) as a slightly yellow solid. 1H NMR (200 MHz, CDCl3) delta 7.99 (s, 1H), 5.10 (br, 2H)

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:
Article; Kwak, Se Hun; Lee, Gee-Hyung; Gong, Young-Dae; Bulletin of the Korean Chemical Society; vol. 33; 12; (2012); p. 4271 – 4274;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Related Products of 5049-61-6, These common heterocyclic compound, 5049-61-6, name is Pyrazin-2-amine, 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.

Step 1: Synthesis of 5-bromopyrazin-2-amine To a stirred solution of pyrazin-2-amine (3 g, 31.545 mmol) in anhydrous DCM (30 mL) was added NBS (5.6 g, 31.54 mmol) under nitrogen and stirred at 0 C. for 1 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 70% DCM/hexane to 10% ethyl acetate in hexane as eluent to yield 5-bromopyrazin-2-amine (3.4 g, 62.9%) as white solid. MS: 175.1 [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

Some common heterocyclic compound, 5049-61-6, name is Pyrazin-2-amine, molecular formula is C4H5N3, 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. SDS of cas: 5049-61-6

To a solution of pyrazin-2-amine(A70, 2.0 g, 2.10 mmol) and ethyl 3- bromo-2-oxopropanoate(A15, 3.0 mL, 2.30 mmol) in ethanol(15.0 mL) was added Cone., HC1(1.0 mL) at 0 C and stirred for 12 h at 95 C. The reaction mixture was concentrated under reduced pressure followed by addition of water(10 mL), the mixture was then extracted with DCM and the organic layer was washed with saturated NaHC03 solution and brine, dried over sodium sulphate, filtered and concentrated under reduced pressure. The obtained crude was purified by combi-flash purifier with 3% methanol in dichloromethane as eluent to afford the desired product A71 as yellow solid(0.4 g, 10 %). 1H NMR (DMSO-d6, 400 MHz) d 1.31(t, / = 7.2 Hz, 3H), 4.33(q, / = 7.2 Hz, 2H), 7.96(d, J = 4.4 Hz, 1H), 8.57(d, J = 4.0 Hz, 1H), 8.66(s, 1H), 9.15(s, 1H); MS(ESI) m/z = 192.1(M+H)+.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 5049-61-6, its application will become more common.

Reference:
Patent; JUBILANT BIOSYS LIMITED; VADIVELU, Saravanan; RAJAGOPAL, Sridharan; BURRI, Raghunadha Reddy; GARAPATY, Shivani; SIVANANDHAN, Dhanalakshmi; THAKUR, Manish Kumar; NATARAJAN, Tamizharasan; SWAMY, Indu N; NAGARAJU, Nagendra; KANAGARAJ, Subramaniam; MOHD, Zainuddin; SARKAR, Sayantani; SAMANTA, Swapan Kumar; ., Hariprakash; (284 pag.)WO2019/102494; (2019); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem