Month: April 2021

Reference of 27825-21-4, A common heterocyclic compound, 27825-21-4, name is Methyl 3-chloropyrazine-2-carboxylate, molecular formula is C6H5ClN2O2, 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.

To a solution of the product from step 1 (100 mg, 0.58 mmol) in toluene (2 mL) was added Pd(PPh3)4 (134 mg, 0.12 mmol) and 2-(tributylstannyl)pyridine (213 mg, 0.58 mmol) at room temperature and the resulting mixture heated to 100 oC overnight. After cooling to RT, the mixture was filtered and 5 mL of aq. KF solution was added to the filtrate. The resulting mixture was stirred for 30 mins and extracted with EtOAc (5 mL x 3). The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The residue was 5 purified by chromatography (30% EtOAc in petroleum ether) to provide the title compound as a oil. LRMS m/z (M+H) 216.1 found, 216.1 required.

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.

Adding a certain compound to certain chemical reactions, such as: 356783-16-9, name is 3,6-Dichloropyrazine-2-carbonitrile, 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 356783-16-9, Formula: C5HCl2N3

KF (1 g, 6 eq) and TBAB (372.3 mg, 0.4 eq) were dissolved in a mixed solvent of toluene (10 ml) and dimethylsulfoxide (5 ml)After azeotropic removal of water,Compound 6 (500 mg, 1 eq) was added,55 ‘C conditions,Stir for 3 h.TLC shows the raw material reaction is complete,After falling to room temperature,30% H2O2 (0.35 ml) was added under ice bath,Reaction at 27 C for 2 h, add water (1 ml) andNaHCO3 (0.132 g, 1.57 mmol),50 reaction 8.5h,Ice bath with 6N HCl,Adjust pH = 1.0,Ethyl acetate (4 x 5 ml)The organic layer was washed twice with saturated brine,Dried over anhydrous sodium sulfate,The organic solvent was distilled off,Recrystallization from 20 times ethanol (crude weight ratio of ethanol to 1: 5 to 30)Obtained as white solid 7 (favipiravir),The yield was 65% (from the reactants6 is calculated).mp: 175-177 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.

Electric Literature of 21279-64-1, These common heterocyclic compound, 21279-64-1, name is 5-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: 150 mg (0.952 mmol) of 5-Cl-PZA (1) or 6-Cl-PZA (2) was dissolved in ethanol together with triethylamine (1 eq., 96 mg, 0.952 mmol). Three equivalents of corresponding alkylamine were added to the reaction mixture and refluxed in ethanol generally for 6 hours. The completion of the reaction was checked by TLC chromatography (eluent: hexane/ethyl acetate, 1:2). The crude product was absorbed on silica by solvent evaporation and purified by flash chromatography (hexane/ethyl acetate gradient elution).

Statistics shows that 5-Chloropyrazine-2-carboxamide is playing an increasingly important role. we look forward to future research findings about 21279-64-1.

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. 23611-75-8, name is Methyl 6-chloropyrazine-2-carboxylate belongs to pyrazines compound, it is a common compound, a new synthetic route is introduced below. Product Details of 23611-75-8

Step 1. Methyl 6-(5-chloro-l-[f4-methylphenyl)sulfonyll-lH-pyrrolo[2 -&]pYridin-3-Yl}- pyrazine-2-carboxylateA solution of methyl 6-chloropyrazine-2-carboxylate (0.1 g, 0.579 mmol), 5- chloro- 1 -[(4-methylphenyl)sulfonyl]-3-(4s4,5,5-tetramethyl- 1 ,3,2-dioxaborolan-2-yl)- 1H- pyrrolo[2,3-&]pyridine (0.276 g, 0.637 mmol), PdCl2(dppf) (0.085 g, 0.116 mmol) and Na2C(¾(0.87 mL, 2 M in water, 1.74 mmol) in DMF (6 mL) was microwaved at 130 C for 20 min. The reaction mixture was concentrated in vacuo and the residue was partitioned between ethyl acetate and water. The organic layer was then washed with 1/2 brine and brine before dried over sodium sulfate, filtered and concentrated in vacuo. The crude product was purified by silica gel chromatography, eluting with a gradient of ethyl acetate: hexane 10:90 to 80:20 to afford the title compound. MS APCI: [M + H]+ m/z = 443.0.

The synthetic route of 23611-75-8 has been constantly updated, and we look forward to future research findings.

23611-75-8, name is Methyl 6-chloropyrazine-2-carboxylate, belongs to pyrazines compound, is considered to be a conventional heterocyclic compound, which is widely used in drug synthesis. The chemical synthesis route is as follows. HPLC of Formula: C6H5ClN2O2

Example 1F; (3aR,6aS)-tert-butyl 5-(6-(methoxycarbonyl)pyrazin-2-yl)hexahydropyrrolo[3,4-c]pyrrole-2(1H)-carboxylate; The product from Example 1E (1.74 g, 10.08 mmol) was dissolved in DMSO (10 mL). The product from Example 1C (2.29 g, 10.79 mmol) and sodium carbonate (1.61 g, 15.19 mmol) were added to the reaction mixture. The reaction was stirred at 120 C. for 16 h. The reaction was then allowed to cool to ambient temperature, diluted with water (100 mL) and extracted with CH2Cl2 (4×100 mL). The organic extracts were combined and washed with water (100 mL) and brine (100 mL), dried over MgSO4, filtered and concentrated under vacuum. The residue was purified by silica gel chromatography (EtOAc, Rf=0.36) to afford the title compound as a thick oil that slowly solidified (2.78 g, 78%). MS (DCI/NH3) m/z 349 (M+H)+.

The synthetic route of 23611-75-8 has been constantly updated, and we look forward to future research findings.

Adding a certain compound to certain chemical reactions, such as: 875781-43-4, name is 2-Bromo-5H-pyrrolo[2,3-b]pyrazine, 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 875781-43-4, SDS of cas: 875781-43-4

To a solution of 2-bromo-5H-pyrrolo [2,3-b] pyrazine (3.1 g, 16 mmol)Of 1,4-dioxane (20 mL)Phosphorus oxychloride (2.27 mL, 24.1 mmol) was added to the solution andTriethylamine (220 [mu] L, 1.58 mmol)110 C for 6 hours,(50 mL x 3), dried over anhydrous sodium sulfate, and the mixture was concentrated and beaten (petroleum ether / ethyl acetate (v / v), and the mixture was stirred at room temperature (7 mL) ) = 2/1), filtration,Dried to give 1.3 g of a gray solid in 54% yield.

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 2-Bromo-5H-pyrrolo[2,3-b]pyrazine, and friends who are interested can also refer to it.

Adding a certain compound to certain chemical reactions, such as: 98-97-5, name is Pyrazine-2-carboxylic acid, 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 98-97-5, COA of Formula: C5H4N2O2

A solution of pyrazine-2-carboxylic acid (Aldrich, 12.41 g, 0.1 mol) in MeOH (Aldrich, anhydrous, 100 mL) was stirred with H2SO4 (Aldrich, concentrated, 2 mL) at reflux for 6 hours. The reaction mixture was then concentrated and treated with saturated aqueous Na2CO3 solution (20 mL) till pH=8-9. The mixture was extracted with EtOAc (3*100 mL), and the combined extracts were washed with brine (2*20 mL) and dried over MgSO4. The drying agent was removed by filtration. The organic solution was concentrated and dried to give the title compound 1H NMR (300 MHz, CDCl3) delta 4.06 (s, 3H), 8.73 (dd, J=2.4, 1.6 Hz, 1H), 8.79 (d, J=2.4 Hz, 1H), 9.33 (d, J=1.6 Hz, 1H) ppm. MS (DCI/NH3) m/z 139 (M+H)+.

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, Pyrazine-2-carboxylic acid, other downstream synthetic routes, hurry up and to see.

Application of 313339-92-3,Some common heterocyclic compound, 313339-92-3, name is 3,5-Dichloropyrazine-2-carbonitrile, molecular formula is C5HCl2N3, 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.

(4-tert-Butoxycarbonyl-aminophenyl)boronic acid pinacol ester (8.26 g) was added to a reaction vessel containing a magnetic stirring bar together with 3,5-dichloro- pyrazine-2-carbonitrile (5.0 g), 1 ,1 ‘-bis(diphenylphosphino)ferrocene-palladium(ll) dichloride (1 .68 g) and cesium carbonate (28.1 g), followed by 100 ml dioxane and 10 ml water, and the mixture heated to 100C under stirring. After 1 h the reaction mixture was cooled to RT and quenched with a saturated aqueous sodium bicarbonate solution (100 ml) and extracted with EtOAc (3 x 200 ml). The combined organic phases were dried over sodium sulfate, filtered and evaporated to afford the crude product as a brown oil which was purified by flash chromatography on silica gel using a mixture of EtOAc and heptane as the eluent. The obtained product was recrystallized from methyl tert-butyl ether to afford [4-(6-chloro-5-cyano-pyrazin-2-yl)phenyl]carbamic acid tert-butyl ester as a pale yellow solid after drying under vacuum. Yield: 6.92 g (73%).

The synthetic route of 313339-92-3 has been constantly updated, and we look forward to future research findings.

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., Computed Properties of C4H5N3

[0077] Method A- oxylate [0078] To a stirred solution of 2-aminopyrazine (1.0 g, 10.5 mmol) in dimethoxyethane, ethyl bromopyruvate (2.36 g, 13.0 mmol) was added at room temperature and stirred for 2.5 hours. The reaction mixture was cooled to 0C and stirred for 30 min to afford a pale brown precipitate. The precipitate was filtered and washed with ethyl acetate to give a pale brown solid. The precipitate was suspended in 50 mL ethyl alcohol and heated at reflux temperature to turn to a clear solution. After refluxing for 2 hours, the reaction mixture was concentrated under reduced pressure and then mixed with CH2CI2 and saturated aqueous NaHCC>3 solution. The mixture was filtered through a pad of Celite, and the separated organic layer was dried by Na2S04 and filtered. The residue was applied to silica gel column chromatography, and the column was eluted with (CH2Cl2:MeOH = 99:1 to 97:3), and the collected fractions were concentrated under reduced pressure. The title compound was obtained as pale yellow crystals (0.546 g, 27%). *H NMR (400 MHz, CDC13) delta 9.21 (s, 1H), 8.26 (s, 1H), 8.09 (dd, 7 = 4.7, 1.6 Hz, 1H), 7.96 (d, 7 = 4.7 Hz, 1H), 4.49 (q, 7 = 7.1 Hz, 2H), 1.45 (t, 7 = 7.1 Hz, 3H).

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.

Related Products of 27398-39-6, A common heterocyclic compound, 27398-39-6, name is 3-Chloropyrazine-2-carboxylic acid, molecular formula is C5H3ClN2O2, 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.

To a solution of 3-chloropyrazine-2-carboxylic acid (100 mg, 0.63 mmol) in DCM/MeOH (2 mL : 0.2 mL) was added TMSCHN2 (0.47 mL, 0.95 mmol) at RT and the resulting mixture stirred at RT for 2 h. Acetic acid (0.2 mL) was added and the mixture diluted with water (2 mL) and extracted with DCM (4 mL x 3). The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated in vacuo to give the title compound as a oil. LRMS m/z (M+H) 173.0 found, 173.0 required.

The synthetic route of 27398-39-6 has been constantly updated, and we look forward to future research findings.