Tag: M.W=100-200

Related Products of 33332-28-4, 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 33332-28-4 as follows.

A solution of 2-amino-6-chloropyrazine (25 g, 193.1 mmol) in MeOH (500 mL) was treated with NBS (34.3 g, 193.1 mmol), portion-wise, over 1 hour. The resulting mixture was stirred for 16 hours thereafter. TLC analysis at this time shows a small amount of starting material remaining. Another 1.4 g NBS added and reaction heated to 50¡ã C. for 2 hours. The mixture was then cooled to 38¡ã C. and treated with NCS (25.8 g, 193.1 mmol). The reaction mixture was heated to 50¡ã C. for 16 hours thereafter. The mixture was then cooled to room temperature and treated with water (500 mL). The precipitate was collected by filtration and dried in a vacuum desiccator to afford 45.4 g (97percent yield) of 2-amino-5-bromo-3,6-dichloropyrazine as a white solid: 13C NMR (75 MHz, CDCl3) delta 149.9 (s), 145.6 (s), 129.6 (s), 121.5 (s). LCMS (15-95percent gradient acetonitrile in 0.1percent TFA over 10 min), single peak retention time=4.51 min on 30 mm column, (M+H)+=244, (M+H+ACN)+=285.

According to the analysis of related databases, 33332-28-4, the application of this compound in the production field has become more and more popular.

Reference:
Patent; MediBeacon Inc.; Rajagopalan, Raghavan; Dorshow, Richard B.; Neumann, William L.; Rogers, Thomas E.; (52 pag.)US2019/125902; (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. 61892-95-3, name is (5-Methylpyrazin-2-yl)methanol, A new synthetic method of this compound is introduced below., Computed Properties of C6H8N2O

EXAMPLE 3 5-methyl-2-pyrazinylmethyl pivalate To a solution of 2-hydroxymethyl-5-methylpyrazine (6.2 g) and triethylamine (6.4 ml) in anhydrous benzene (150 ml) dropwise addition was made of a solution of pivaloyl chloride (6.15 ml) in anhydrous benzene (50 ml). The solution was maintained at boiling for 7 hours, the solvent was then evaporated and the residue treated with acetone. After filtration of the insoluble solid, the filtrate was evaporated to dryness and the residue re-dissolved in chloroform. The chloroform solution was first dehydrated and then evaporated to dryness, obtaining 7 g (71.5%) of 5-methyl-2-pyrazinylmethyl pivalate, b.p.=74 C./0.1 mmHg. The following compounds were similarly obtained: 2-pyrazinylmethyl pivalate; 5-fluoro-2-pyrazinylmethyl pivalate; 5-chloro-2-pyrazinylmethyl pivalate; 5-bromo-2-pyrazinylmethyl pivalate; 5-methoxy-2-pyrazinylmethyl pivalate; 3-amino-2-pyrazinylmethyl pivalate; 5-amino-2-pyrazinylmethyl pivalate; 6-amino-2-pyrazinylmethyl pivalate; 6-methyl-2-pyrazinylmethyl pivalate; 3-methyl-2-pyrazinylmethyl pivalate; 5,6-dimethyl-2-pyrazinylmethyl pivalate; 2-pyrazinylmethyl propionate; 6-methyl-2-pyrazinylmethyl propionate; 5-methyl-2-pyrazinylmethyl propionate; 5,6-dimethyl-2-pyrazinylmethyl propionate; 5-fluoro-2-pyrazinylmethyl propionate; 5-chloro-2-pyrazinylmethyl propionate; 5-bromo-2-pyrazinylmethyl propionate; 5-methoxy-2-pyrazinylmethyl propionate; 3-amino-2-pyrazinylmethyl propionate; 5-amino-2-pyrazinylmethyl propionate; 6-amino-2-pyrazinylmethyl propionate; 2-pyrazinylmethyl acrylate; 5-methyl-2-pyrazinylmethyl acrylate; 6-methyl-2-pyrazinylmethyl acrylate; 3-methyl-2-pyrazinylmethyl acrylate; 5,6-dimethyl-2-pyrazinylmethyl acrylate; 5-fluoro-2-pyrazinylmethyl acrylate; 5-chloro-2-pyrazinylmethyl acrylate; 5-bromo-2-pyrazinylmethyl acrylate; 5-methoxy-2-pyrazinylmethyl acrylate; 5-amino-2-pyrazinylmethyl acrylate; 3-amino-2-pyrazinylmethyl acrylate; 6-amino-2-pyrazinylmethyl acrylate; 2-pyrazinylmethyl-cyclohexylcarboxylate; [(5-methyl)-2-pyrazinylmethyl]-cyclohexylcarboxylate; [(6-methyl-2-pyrazinylmethyl]-cyclohexylcarboxylate; [(3-methyl)-2-pyrazinylmethyl]-cyclohexylcarboxylate; [(5-fluoro)-2-pyrazinylmethyl]-cyclohexylcarboxylate; [(5-chloro)-2-pyrazinylmethyl]-cyclohexylcarboxylate; [(5-bromo)-2-pyrazinylmethyl]-cyclohexylcarboxylate; [(5-methoxy)-2-pyrazinylmethyl]-cyclohexylcarboxylate; [(5-amino)-2-pyrazinylmethyl]-cyclohexylcarboxylate; [(6-amino)-2-pyrazinylmethyl]-cyclohexylcarboxylate; [(3-amino)-2-pyrazinylmethyl]-cyclohexylcarboxylate.

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; Farmitalia Carlo Erba S.p.A.; US4267327; (1981); A;,
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. 875781-43-4, name is 2-Bromo-5H-pyrrolo[2,3-b]pyrazine, This compound has unique chemical properties. The synthetic route is as follows., COA of Formula: C6H4BrN3

General procedure: 2-Bromo-5H-pyrrolo[3,2-b]pyrazine(4; 0.471 g,2.39 mmol), 4-pyridylboronic acid (0.58 g, 4.72 mmol), dichloro 1,1′-bis(diphenylphosphino)ferrocenepalladium (II) dichloromethane adduct (0.097 g, 0.12 mmol), acetonitrile(3 mL) and 1M sodium carbonate (3 mL) were placed in a 10 mL CEM microwavevial. The vial was capped and irradiated in a CEM microwave reactor for 30minutes at 150 C.Water (3 mL) and ethyl acetate (9 mL) were added the layers were partitioned. Theaqueous layer was extracted with ethyl acetate (2 x 10 mL). The combined organicextracts were washed with saturated sodium chloride (5 mL), dried over MgSO4and concentrated under reduced pressure. The residue was purified by preparativereverse phase HPLC to give 2-(pyridin-4-yl)-5H-pyrrolo[2,3-b]pyrazine(14; 0.28 g,60%) as an off white solid: 1H NMR (400 MHz, DMSO-d6) delta 12.24 (s, 1H), 9.00(s, 1H), 8.69 (dd, J = 4.5, 1.6 Hz, 2H), 8.12 (dd, J = 4.5, 1.6Hz, 2H), 7.98 (d, J = 3.6 Hz, 1H), 6.74 (d, J = 3.6 Hz, 1H); ESMSm/z 197.1 (M+1).

According to the analysis of related databases, 875781-43-4, the application of this compound in the production field has become more and more popular.

Reference:
Article; Burdick, Daniel J.; Wang, Shumei; Heise, Christopher; Pan, Borlan; Drummond, Jake; Yin, Jianping; Goeser, Lauren; Magnuson, Steven; Blaney, Jeff; Moffat, John; Wang, Weiru; Chen, Huifen; Bioorganic and Medicinal Chemistry Letters; vol. 25; 21; (2015); p. 4728 – 4732;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Electric Literature of 54608-52-5, These common heterocyclic compound, 54608-52-5, name is 2-Hydrazinopyrazine, 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 2-hydrazinopyrazine (820 mg, 7.45 mmol), prepared from 2-chloropyrazine and hydrazine using a procedure analogous to that described in the literature (P. J. Nelson and K. T. Potts, J. Org. Chem. 1962, 27, 3243, except that the crude product was extracted into 10% methanol/dichloromethane and filtered, and the filtrate was concentrated and purified by flash chromatography on silica gel, eluting with 100% ethyl acetate followed by 10% methanol in dichloromethane), TFA (2.55 g, 22.4 mmol), and polyphosphoric acid (10 mL) was heated to 140 C. with stirring for 18 h. The solution was added to ice and neutralized by the addition of ammonium hydroxide. The aqueous solution was extracted with ethyl acetate (3¡Á), washed with brine, and dried over anhydrous magnesium sulfate. Concentration followed by flash chromatography (silica gel, 1:1 hexane:ethyl acetate, then 100% ethyl acetate) afforded the title compound as a solid (861 mg). 1H NMR (500 MHz, CDCl3) delta 8.17-8.20 (m, 2H), 9.54 (s, 1H). LC/MS (M+1) 189

Statistics shows that 2-Hydrazinopyrazine is playing an increasingly important role. we look forward to future research findings about 54608-52-5.

Reference:
Patent; Merck Sharp & Dohme Corp.; Edmondson, Scott D.; Fisher, Michael H.; Kim, Dooseop; Maccoss, Malcolm; Parmee, Emma R.; Weber, Ann E.; Xu, Jinyou; US2015/359793; (2015); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

486460-21-3, name is 3-(Trifluoromethyl)-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyrazine, 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. category: Pyrazines

Select the above embodiment 1The corresponding enamine key intermediate compound of formula II (3.4 mmol)Join the reaction flask, thenAdding the corresponding compound of formula III3-(trifluoromethyl)-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyrazine (3.4 mmol)a solution of dichloromethane (50 mL),Control temperature is added at about 0CHOBT (545 mg, 4.2 mmol),Stir for 10 minutes,Then add EDC (1.9g, 10.0mmol),After removing the ice bath,Under stirring, the mixture was slowly heated to room temperature and stirred for 14 hours.After the reaction is over,The reaction solution is concentrated to remove the solvent,Get the corresponding residue,After silica gel column chromatography,The pure fractions are combined and then concentrated to dryness under reduced pressure.This afforded 1.3 g of compound of formula IV-1 as an off-white solid.

The synthetic route of 486460-21-3 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Zhejiang Xin Donggang Pharmaceutical Co., Ltd.; Cheng Die; Lin Yi; Yan Jianbo; Hong Huabin; (23 pag.)CN107540677; (2018); A;,
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. 91476-80-1, name is 5,6,7,8-Tetrahydroimidazo[1,2-a]pyrazine, This compound has unique chemical properties. The synthetic route is as follows., name: 5,6,7,8-Tetrahydroimidazo[1,2-a]pyrazine

Step A: To a solution of NaH (60% dispersion in mineral oil, 0.130 g, 3.25 mmol) in THF (10 mL) was added 5,6,7,8-tetrahydroimidazo[1,2-a]pyrazine (0.33 g, 2.71 mmol) and the reaction mixture stirred for 10 min. Methyl 2-chlorobenzoxazole-4-carboxylate (478 mg, 2.26 mmol), in THF (10 mL) was added and the reaction mixture was allowed to stir at room temperature 17 h. The reaction mixture was quenched with CH3OH (3 mL), and adsorbed onto silica gel (2 g). The crude product was purified by column chromatography (silica gel, 0.5 to 10% CH3OH in CH2Cl2) to afford methyl 2-(5,6-dihydroimidazo[1,2-a]pyrazin-7(8H)-yl)benzoxazole-4-carboxylate (251 mg, 37%) as an orange oil. 1H NMR and MS consistent.

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 91476-80-1.

Reference:
Patent; AMR TECHNOLOGY, INC.; US2008/255114; (2008); A1;,
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 27398-39-6 as follows. Recommanded Product: 3-Chloropyrazine-2-carboxylic acid

Intermediate Y 3-(Pyridin-2-yl)pyrazine-2-carboxylic acid Step 1 : methyl 3-chloropyrazine-2-carboxylate (YD 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 was stirred at RT for 2 h. Acetic acid (0.2 mL) was added and the mixture was diluted with water (2 mL) and extracted with DCM (4 mL x 3). The combined organic layers were washed with brine, dried over Na2S04, filtered, and concentrated in vacuo to give the title compound. LRMS m/z (M+H) 173.0 found, 173.0 required.

According to the analysis of related databases, 27398-39-6, the application of this compound in the production field has become more and more popular.

Reference:
Patent; MERCK SHARP & DOHME CORP.; KIM, Ronald; KUDUK, Scott, D.; LIVERTON, Nigel; ZHUO, Gang; (116 pag.)WO2016/100161; (2016); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Electric Literature of 22047-25-2, These common heterocyclic compound, 22047-25-2, name is Acetylpyrazine, 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: 1-(Pyrazin-2-yl)ethan-1-one or 1-(5-alkylpyrazin-2-yl)ethan-1-one (0.01 mol) and thecorresponding halogenated benzaldehyde (0.01 mol) were dissolved in pyridine (4.4 mL).Diethylamine (0.01 mol) was added, and the reaction mixture was stirred at 80-120 C for 1 h. Aftercooling, the mixture was poured into ice water (200 mL), acidified to pH 3 with a few drops of aceticacid, and then refrigerated for 24 h. The separation of crude products from water depended on theircharacter. Solids were filtered off and crystallized from anhydrous ethanol, while oily mixtures wereextracted with diethyl ether and subjected to flash chromatography on silica gel. Hexane-ethyl acetatewas used as the eluent in an appropriate ratio (70:30 (v/v), 80:20 (v/v) or 90:10 (v/v)). The fractionscontaining the desired compounds were combined and crystallized from absolute ethanol to obtainanalytically pure crystals.

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

Reference:
Article; Kucerova-Chlupacova, Marta; Vyskovska-Tyllova, Veronika; Richterova-Finkova, Lenka; Kunes, Jiri; Buchta, Vladimir; Vejsova, Marcela; Paterova, Pavla; Semelkova, Lucia; Jandourek, Ondrej; Opletalova, Veronika; Molecules; vol. 21; 11; (2016);,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Adding a certain compound to certain chemical reactions, such as: 13924-95-3, name is Methyl 5-hydroxypyrazine-2-carboxylate, 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 13924-95-3, Safety of Methyl 5-hydroxypyrazine-2-carboxylate

(62b) Methyl 5-Chloropyrazine-2-carboxylate Methyl 5-hydroxypyrazine-2-carboxylate (673 mg, 4.37 mmol) synthesised in Example (62a) was dissolved in phosphorous oxytrichloride (6.1 mL), and a few drops of N,N-dimethylformamide were added, followed by heating to reflux for 2 hours under nitrogen atmosphere. The reaction solution was poured into ice water, and extraction was carried out three times with chloroform (30 mL). The organic layer was washed with saturated aqueous sodium hydrogencarbonate solution and saturated brine (100 mL each), and subsequently dried over sodium sulfate. The solvent was distilled off under reduced pressure to afford the desired compound (611 mg, yield 81%) as a gray solid. 1H-NMR (CDCl3, 400 MHz): delta 4.05 (3H, s), 8.71 (1H, d, J=1.6 Hz), 9.10 (1H, d, J=1.2 Hz).

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

Reference:
Patent; Daiichi Sankyo Company, Limited; EP2239253; (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. 1111638-10-8, name is 3-Chloro-5H-pyrrolo[2,3-b]pyrazine, This compound has unique chemical properties. The synthetic route is as follows., category: Pyrazines

Preparation of 3-chloro-5-methyl-5H-pyrrolo[2,3-b]pyrazine (B-10-6).B-10-5 , B-10-6 A solution was made of 310 mg (1.95 mmol) of compound B-10-5 in 3 ml of anhydrous DMF. This mixture was added to a solution of 125 mg (3.05 mmol) of 60% NaH dispersion in mineral oil in 3 ml of anhydrous DMF. Another 6 ml of DMF was used to rinse the container. Let stir reaction mixture stir for 15 min at room temperature. Added another 150 mul (2.40 mmol) of MeI. Let stir for 2 hr. LCMS shows one peak M+H = 168 with Cl isotope pattern. The reaction mixture was poured into saturated NH4CI solution (100 ml) slowly, then extracted with EtOAc (3 x 50 ml). The organics were combined, dried over MgSO4 and filtered. Silicia gel chromoatography using EtOAc/Hexane gave 257 mg (76% yield) of compound B-10-6 as a yellow solid.

According to the analysis of related databases, 1111638-10-8, the application of this compound in the production field has become more and more popular.

Reference:
Patent; PFIZER INC.; WO2009/16460; (2009); A2;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem