Tag: M.W=100-200

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. 4858-85-9, name is 2,3-Dichloropyrazine, This compound has unique chemical properties. The synthetic route is as follows., Formula: C4H2Cl2N2

2,3-Dichloropyrazine (III-9) (500 mg, 3.36 mmol) and 4-chlorophenol (II-17) (431 mg, 3.36 mmol) were dissolvedin DMF (10 mL), potassium carbonate (557 mg, 4.03 mmol) was added and the mixture was stirred at 90C for 15 hr.The reaction mixture was cooled, water was added, and the mixture was extracted with ethyl acetate. The organic layerwas washed successively with water and saturated brine, and the solvent was evaporated under reduced pressure. Theresidue was purified by silica gel column chromatography (n-hexane:ethyl acetate = 100:0 ? 85:15) to give compound(IV-102) (yield 809 mg, quantitative) as a white solid

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 4858-85-9.

Reference:
Patent; Kaken Pharmaceutical Co., Ltd.; WATANABE, Atsushi; SATO, Yuuki; OGURA, Keiji; TATSUMI, Yoshiyuki; (331 pag.)EP3351533; (2018); 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. 68774-77-6, name is 8-Chloro[1,2,4]triazolo[4,3-a]pyrazine, This compound has unique chemical properties. The synthetic route is as follows., SDS of cas: 68774-77-6

A mixture of 8-chloro-[l,2,4]triazolo[4,3-a]pyrazine (620 mg, 4.0 mmol) and (S)-tert-butyl pyrrolidin-3-ylcarbamate (1.2 g, 6.5 mmol) in diethylisopropyl amine (3 mL) was heated to 120 C. for 2 h. After cooling to room temperature, the mixture was diluted with 10% MeOH in EtOAc and washed with saturated aqueous solutions of KH2PO4 and NaHCO3, followed by brine. The organic layerwas concentrated in vacuo and the residue purified by flashchromatography (SiO2, 2 to 5% MeOH in CH2Cl2 as eluent) to give the desired compound as a foam (1.15 g, 95% yield, which was used directly for the next step). MS: (ES) m/z305.2 (M+H+).

According to the analysis of related databases, 68774-77-6, the application of this compound in the production field has become more and more popular.

Reference:
Patent; ChemoCentryx, Inc.; Fan, Junfa; Krasinski, Antoni; Lange, Christopher W.; Lui, Rebecca M.; McMahon, Jeffrey P.; Powers, Jay P.; Zeng, Yibin; Zhang, Penglie; US2014/154179; (2014); 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. 1029721-02-5, name is 4-Oxo-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine-2-carboxylic acid, A new synthetic method of this compound is introduced below., category: Pyrazines

To a suspension of 4,5,6, 7-tetrahydro-4-oxo-pyrazolo[1 ,5-a]pyrazine-2 carboxylic acid (181 mg, 1.0 mmol) in THF (15 mL) was added diphenylphosphoryl azide (0.25 mL, 1.0 mmol) and Et3N (0.28 mL. 2.0 mmol) The resulting mixture was heated to reflux for 6 h and cooled to room temperature. Then 6-fluoro-1-(piperidin-4-yl)indoline (88 mg, 0.4 mmol) and Et3N (0.14 mL, 1.0 mmol) were added sequentially. The resulting mixture was stirred at room temperature for 24 h and concentrated. The resulting residue was purified by chromatography using EtOAc, then 2-5% MeOH/EtOAc as the eluent to yield 4-(6-fluoroindolin-1-yl)-N-(4-oxo-4,5,6,7-tetrahydropyrazolo[1 ,5- a]pyrazin-2-yl)piperidine-1-carboxamide.

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; JANSSEN PHARMACEUTICA NV; YANG, Shyh-Ming; KUO, Gee-Hong; GAUL, Micheal, D.; RANO, Thomas, A.; WO2013/85954; (2013); 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. 6905-47-1, name is 2-Amino-6-methoxypyrazine, A new synthetic method of this compound is introduced below., Safety of 2-Amino-6-methoxypyrazine

Step 28.1 : (preparation of a compound of formula (Clll)) 1 -(6-Methoxypyrazin-2-yl)-3-[4-(4,4,5,5-tetramethyl-[1 ,3,2]dioxaborolan-2- yl)phenyl]urea A mixture of 350 mg (1.60 mmol) of 4-(4,4,5,5-tetramethyl-[1 ,3,2]dioxaborolan-2- yl)phenylamine and 1 .35 ml (9.59 mmol) of triethylamine in 10 ml of DCM is added, under nitrogen, to a solution of 474.07 mg (1.60 mmol) of triphosgene in 30 ml of DCM. The mixture is stirred for 30 minutes at room temperature, followed by addition of 1 g (7.99 mmol) of 6-methoxypyrazin-2-amine. The resulting mixture is stirred for 2 hours at room temperature. Water is added and the product is extracted with DCM. The solution is dried over MgS04 and then filtered. The filtrate is evaporated under reduced pressure and the residue is then chromatographed on silica gel, eluting with a DCM/MeOH mixture from (100/0 v/v) up to (96/4 v/v). The solvent is evaporated off under reduced pressure. The residue is taken up in ethyl acetate and washed three times with 1 N hydrochloric acid solution and then with saturated NaCI solution. The resulting solution is dried over MgSCv 167 mg of 1 -(6-methoxypyrazin-2-yl)-3-[4-(4,4,5,5-tetramethyl- [1 ,3,2]dioxaborolan-2-yl)phenyl]urea are obtained. LC/MS (method E): M+H+ = 371 ; Tr = 2.46 min

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; SANOFI; BRAUN, Alain; CRESPIN, Olivier; FORICHER, Yann; MARCINIAK, Gilbert; MUZET, Nicolas; NICOLAI, Eric; PASCAL, Cecile; VIVET, Bertrand; VIVIANI, Fabrice; WO2013/111106; (2013); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Adding a certain compound to certain chemical reactions, such as: 4858-85-9, name is 2,3-Dichloropyrazine, 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 4858-85-9, name: 2,3-Dichloropyrazine

To 2,3-Dichloro-pyrazine (18 g, 120.82 mmol), ammonium hydroxide (50 ml, 1280 mmol) is added and the reaction mixture is microwaved at 140 C. for 25 minutes. The reaction mixture is filtered and washed with water to yield 3-Chloro-pyrazin-2-ylamine.

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.

Reference:
Patent; BRUCE, Ian; BUDD, Emma; EDWARDS, Lee; HOWSHAM, Catherine; US2009/239847; (2009); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Some common heterocyclic compound, 22047-25-2, name is Acetylpyrazine, molecular formula is C6H6N2O, 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. HPLC of Formula: C6H6N2O

General procedure: Catalyst (0.1mol %) and KOH (1mmol) were dissolved in 2-propanol (4mL). To this solution, substrate (1mmol) was added and the mixture was refluxed (82C). The progress of the reaction was monitored by GC at regular intervals. After the completion of the reaction, the reaction mixture was cooled to room temperature and filtered through silica gel or alumina bed, and eluted using 50% ethyl acetate-hexane mixture. The eluted solution was reduced and analyzed by GC and/or GCMS.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 22047-25-2, its application will become more common.

Reference:
Article; Sathishkumar, Pushpanathan N.; Raveendran, Neethi; Bhuvanesh, Nattamai S.P.; Karvembu, Ramasamy; Journal of Organometallic Chemistry; vol. 876; (2018); p. 57 – 65;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Reference of 21279-62-9, These common heterocyclic compound, 21279-62-9, name is 3-Chloropyrazine-2-carboxamide, 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: Compounds 1-6 were prepared according to conventional organic synthesis methods. 3-Chloropyrazine-2-carboxamide (1.27 mmol) was dissolved in THF (20 mL) in a round bottom flask and after that treated with two equivalents of the corresponding benzylamine and an equimolar amount of triethylamine. The reaction was conducted with continuous stirring and heating (70 C) under reflux in an oil bath for 15 h. Compounds 7-15 were synthesised using a microwave reactor with a focused field. 3-Chloropyrazine-2-carboxamide (1.27 mmol) was put into a thick-walled tube together with the corresponding benzylamine (2.54 mmol), pyridine (1.27 mmol), methanol (approx. 5 mL) and a magnetic stir bar and then sealed with a special cap. The reaction parameters were set according to the previously published paper as follows-140 C, 30 min, 200 W [29]. Reaction progress was checked by TLC (hexane:ethyl acetate-1:1). Regardless of the synthesis method used,all reaction mixtures were adsorbed on silica and subjected to preparative flash chromatography (hexane and ethyl acetate, gradient elution, detection wavelengths 260 nm and 280 nm). Products were recrystallized from ethanol or ethanol and water if necessary. All final substances were chemically characterized (1H-NMR, 13C-NMR, IR, melting point and elemental analysis).

Statistics shows that 3-Chloropyrazine-2-carboxamide is playing an increasingly important role. we look forward to future research findings about 21279-62-9.

Reference:
Article; Jandourek, Ondrej; Tauchman, Marek; Paterova, Pavla; Konecna, Klara; Navratilova, Lucie; Kubicek, Vladimir; Holas, Ondrej; Zitko, Jan; Dolezal, Martin; Molecules; vol. 22; 2; (2017);,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

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 710322-57-9 as follows. Quality Control of Methyl 5-formylpyrazine-2-carboxylate

[000243] A mixture of 5-formyl-pyrazine-2-carboxylic acid methyl ester (325 mg, 1.56 mmol), ethylene glycol (100 pL, 1.79 MMOL), and p-toluenesulfonic acid monohydrate (30 mg, 0.157 mmol) in benzene (10 mL) was heated under reflux with a Dean-Stark condenser for 17 h. The mixture was cooled and diluted with benzene (25 mL). The organic layer was washed with a saturated aqueous sodium bicarbonate solution (25 ML) and a saturated aqueous sodium chloride solution (25 mL). Each aqueous wash was back-extracted with a small portion of benzene. The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo to afford 5- [L, 3dioxolan-2-yl-pyrazine-2-carboxylic acid methyl ester as an orange-red oil (250 mg).

According to the analysis of related databases, 710322-57-9, the application of this compound in the production field has become more and more popular.

Reference:
Patent; F. HOFFMANN-LA ROCHE AG; WO2004/52869; (2004); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Synthetic Route of 22047-25-2, A common heterocyclic compound, 22047-25-2, name is Acetylpyrazine, molecular formula is C6H6N2O, 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: A 2-neck round bottom flask attached with calcium chloride guard tube was charged with MeOH (30mL). Then, 2-acetylpyrazine (1.47g, 2mmol) followed by KOH pellets (0.675g, 2mmol) were added and initiated magnetic stirring. To this mixture, distilled water (2mL) was added and continued stirring for 10min. Now, the resulting solution was added the respective n,n?,n?-trimethoxyphenyl benzaldehydes (1.0g, 1mmol) under stirring at room temperature slowly and then 6mL of ammonia solution was added. The reaction mixture was stirred further for 4h. The reaction was monitored by TLC. On completion of reaction by TLC, the reaction mass was filtered and washed with methanol (3¡Á10 mL) and then diethyl ether (3¡Á10 mL) to obtain a white precipitate of respective compounds. Each of the above precipitates was recrystallised in a mixture of CHCl3 and MeOH (1:1) at room temperature for 48h. The resulting colourless single crystals of 1-3 were collected by filtration.

The synthetic route of 22047-25-2 has been constantly updated, and we look forward to future research findings.

Reference:
Article; Ramesh; Sharath Kumar; Raghavendra Kumar; Suchetan; Devaraja; Sabine, Foro; Nagaraju; Journal of Molecular Structure; vol. 1200; (2020);,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Related Products of 77112-52-8, 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 77112-52-8 as follows.

To the suspension of imidazo[1,2-a]pyrazine-2-carboxylic acid ethyl ester (0.3 g, 0.0016 mol) in anhydrous ethanol (7 mL), the chilled solution of bromine (0.16 mL, 0.0032 mol) in anhydrous ethanol (7 mL) was added dropwise and the resulting mixture was heated at reflux under continuous nitrogen flow for 1.5 hours. The reaction mixture was concentrated under reduced pressure and treated with the saturated solution of sodium bicarbonate in water (50 mL). The aqueous layer was extracted with ethyl acetate (3×25 mL), the combined organic extracts were dried with magnesium sulfate and concentrated. The residue was suspended in heptane (30 mL) and the precipitate was collected by filtration and dried to yield 5-bromo- imidazo [1,2-a]pyrazine-2-carboxylic acid ethyl ester (0.075 g, 0.00028 mol) as a yellow solid. m/z: (M + H) + 270,272.

According to the analysis of related databases, 77112-52-8, the application of this compound in the production field has become more and more popular.

Reference:
Patent; ABBOTT LABORATORIES; WO2005/110410; (2005); A2;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem