Tag: M.W=100-200

Synthetic Route 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.

2,3-Dichloro-N-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-benzenesulfonamide (5.78 g) was added to a reaction vessel containing a magnetic stirring bar together with 3,5-dichloro-pyrazine-2-carbonitrile (2.35 g), 1,1′-bis(diphenylphosphino)ferrocene-palladium(II) dichloride (Pd(dppf)2Cl2) (791 mg) and cesium carbonate (13.2 g), followed by 100 ml dioxane and 10 ml water, and the mixture heated to 100C under stirring. After 3 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 aqueous phases were dried over sodium sulfate, filtered and evaporated to afford the crude product as a brown oil. Purification by flash chromatography on silica gel using a mixture of EtOAc and heptane as the eluent afforded 2,3-dichloro-N-[4-(6-chloro-5-cyano-pyrazin-2yl)-phenyl]-benzenesulfonamide as a light brown foam after evaporation of the solvents under reduced pressure. Yield: 4.32 g (73%). MS (ES-): m/e = 436.0 (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 3,5-Dichloropyrazine-2-carbonitrile, its application will become more common.

Reference:
Patent; SANOFI; Nazare, Marc; Halland, Nis; Schmidt, Friedemann; Weiss, Thilo; Hofmeister, Armin; EP2570415; (2013); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Application of 153800-11-4, As we all know, there are many different methods for the synthesis of a compound, and people can choose the synthesis method that suits their own laboratory according to the actual situation. 153800-11-4 name is 2-Ethynylpyrazine, This compound is widely used in many fields, so it is necessary to find a new synthetic route. The downstream synthesis method of this compound is introduced below.

To a solution of 18i(i00m, 03i9mmol) and 10(66.5mg, 0.639mmo1) in 2OmL of Et3N wasadded Pd(PPh3)2C12 (11.21mg, 0Oi6mmoi) and CuT (608mg, 0O32mmoi). The mixture wasprotected with N: atmosphere, then was heated at 70C for 4 hours. TLC analysis showed complete conversion of starting material to a major product. The reaction mixture was then concentrated in vacuo. The crude product was purified by Prep-i-IPLC to give the target product Compound 111(18mg, yield: 1948%).LCMS: rn/z 290 (M¡ÀH) +?H NMR (400 MHz, CDCI3): 5 8.84 (d, J 1.6 Hz, 1H), 8.63-8.62 (rn, IH), 8.55 (d, J= 2.4 Hi, 111) 97 (d 1 2 S Hi III) 7 8 (t, 1H? 7 79 (d 1 9 2 hi ill) 4- 2 (in, 111), 6.83 (d, J:::: 2.4 Hz, IH),

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

Reference:
Patent; HUA MEDICINE (SHANGHAI) LTD.; CHEN, Li; JIN, Xiaowei; (176 pag.)WO2017/117708; (2017); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Synthetic Route of 3149-28-8, The chemical industry reduces the impact on the environment during synthesis 3149-28-8, name is 2-Methoxypyrazine, I believe this compound will play a more active role in future production and life.

General procedure: Perfluorobutanesulfonyl azides 1a (715 mg, 2.2 mmol) and pyrazine 2a (2.0 mmol) was mixed without solvent at room temperature, this reaction mixture stirred for 8 h at 120 C, TLC analysis showed the reaction was completed. The product 3aa was obtained by flash column chromatography (using petroleum ether/ethyl acetate=2:1 as eluant) as a yellow solid in 34% yield (234 mg).

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

Reference:
Article; Xiong, Wanting; Zhang, Hongfei; Xin, Yong; Zhu, Shizheng; Tetrahedron; vol. 67; 12; (2011); p. 2232 – 2237;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Synthetic Route of 123-32-0, 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. 123-32-0, name is 2,5-Dimethylpyrazine belongs to Pyrazines compound, it is a common compound, a new synthetic route is introduced below.

(b) 3,6-Dimethylpyrazin-2-amine[00426] A mixture of 2,5-dimethylpyrazine (14 g, 0.13 mol) in N,N-dimethylaniline (50 mL) was heated to 170 C and NaNH2 (22 g, 0.56 mol) was added in portions. The reaction mixture was stirred at 170 C for 1 h, and the solvent was removed. The product was purified by column chromatography to give 3,6-dimethylpyrazin-2-amine as a brown solid (1.6 g). MS (ESI): m/z 124[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, 2,5-Dimethylpyrazine, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; SUNOVION PHARMACEUTICALS INC.; CAMPBELL, John, Emerson; HEWITT, Michael, Charles; JONES, Philip; XIE, Linghong; WO2011/150156; (2011); A2;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Reference of 109838-85-9, These common heterocyclic compound, 109838-85-9, name is (R)-2-Isopropyl-3,6-dimethoxy-2,5-dihydropyrazine, 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 A – Synthesis of Intermediate Compound Int-6c A 5 L- 3 necked round bottomed flask, equipped with a mechanical stirrer, temperature probe, addition funnel and N2 inlet, was charged with the Schollkopf chiral auxiliary-(Int-6a, 200 g, 1.09 mol, 1.0 eq), bis(chloromethyl) dimethylsilane (Int-6b, 256 g, 1.63 mol, 1.5 eq), and THF (2 L, Aldrich anhydrous). The flask was cooled in a dry ice/ 2- propanol bath until the internal temperature reached -75 ¡ãC. n-Butyl lithium (Aldrich 2.5 M in hexanes , 478 mL, 1.19 mol, 1.09 eq) was added via a dropping funnel over 1 hour while maintaining the internal reaction temperature between -67 ¡ãC and -76 ¡ãC. The resulting orange-red solution was allowed to gradually warm to room temperature for about 15 hours. The reaction mixture was then re-cooled to 0 ¡ãC and quenched with 500 mL of water.Diethyl ether (2L) was added and the layers were separated. The aqueous layer was extracted with 1 L of diethyl ether. The combined organic layers was washed with water and brine, dried with MgS04, filtered, and concentrated in vacuo to provide 480 g of an orange oil. This material was left in vacuo for about 15 hours to provide 420 g of oil(mixture of Int-6c and Int-6c’). The crude product was split into two batches and purified via silica gel chromatography on a 1.6 Kg flash column. The column was eluted with gradient of 0-4percent Et20 in hexanes. The product fractions were concentrated in vacuo at a bath temperature at or below 40 ¡ãC to provide 190 grams of Compound Int-6c (60percent yield).

Statistics shows that (R)-2-Isopropyl-3,6-dimethoxy-2,5-dihydropyrazine is playing an increasingly important role. we look forward to future research findings about 109838-85-9.

Reference:
Patent; MERCK SHARP & DOHME CORP.; DWYER, Michael, P.; KEERTIKAR, Kartik, M.; ZENG, Qingbei; MAZZOLA, Robert, D., Jr.; CALDWELL, John, P.; TANG, Haiqun; NAIR, Anilkumar Gopinadhan; SHANKAR, Bandarpalle, B.; ROSENBLUM, Stuart, B.; KOZLOWSKI, Joseph, A.; WO2013/39878; (2013); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

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, category: Pyrazines

To a solution of pyrazine-2-carboxylic acid (1 g, 8.06 mmol) in DMF (5 mL), 4-methyl-3-thiosemicarbazide (933 mg, 8.87 mmol) was added. DIPEA (2.5 mL, 14.5 mmol) was added drop-wise at RT, then the mixture was cooled in an ice-bath before adding T3P (50% w/wEtOAc) (7.1 mL, 12.09 mmol). The reaction was stirred at RT on. NaOH 4 M solution (7.5mL) was added (resulting pH=8). The reaction was diluted with EtOAc and the two resulting phases were separated (the upper organic layer eliminated). The pH was increased to 11 NaOH 4and the mixture heated to 70 C for 2h. The yellow solution was then cooled in an ice bath and 37% HC1 was slowly added till pH 5. A precipitate formed. It was filtered under vacuum, washed with water and Cy and dried to obtain 1.44 g of title compound (p20, y%92). MS(m/z): 194.1 [MH]t

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; INDIVIOR UK LIMITED; CREMONESI, Susanna; MICHELI, Fabrizio; SEMERARO, Teresa; TARSI, Luca; (318 pag.)WO2017/21920; (2017); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Some common heterocyclic compound, 6705-33-5, name is Pyrazin-2-ylmethanol, molecular formula is C5H6N2O, 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. Formula: C5H6N2O

General procedure: 1.0 eq. ethyl (2R)-2-acetoxy-3-(2-hydroxyphenyl)propanoatc (Preparation 3aa-(R)), 2.0eq. of the appropriate alcohol and 2.0 eq. triphenylphosphine were dissolved in dry toluene(0.2 M for the phenol), then 2.0 eq. di-tert-butyl azodicarboxylate was added. The mixturewas stirred at 50C under nitrogen. After reaching an appropriate conversion the volatileswere removed under reduced pressure, the crude intermediate was purified via flash chromatography using heptane / EtOAc as cluents.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 6705-33-5, its application will become more common.

Reference:
Patent; LES LABORATOIRES SERVIER; VERNALIS (R&D) LIMITED; KOTSCHY, Andras; SZLAVIK, Zoltan; CSEKEI, Marton; PACZAL, Attila; SZABO, Zoltan; SIPOS, Szabolcs; RADICS, Gabor; PROSZENYAK, Agnes; BALINT, Balazs; BRUNO, Alain; GENESTE, Olivier; DAVIDSON, James Edward Paul; MURRAY, James Brooke; CHEN, I-Jen; PERRON-SIERRA, Francoise; WO2015/97123; (2015); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Related Products of 109838-85-9, 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 109838-85-9 as follows.

Step A – Synthesis of Intermediate Compound Int-23c (0372) A 5 L- 3 necked round bottomed flask, equipped with a mechanical stirrer, temperature probe, addition funnel and N2 inlet, was charged with the Schollkopf chiral auxiliary-(Int-23a, 200 g, 1.09 mol, 1.0 eq), bis(chloromethyl) dimethylsilane (Int-23b, 256 g, 1.63 mol, 1.5 eq), and THF (2 L, Aldrich anhydrous). The flask was cooled in a dry ice/ 2-propanol bath until the internal temperature reached -75 ¡ãC. n-Butyl lithium (Aldrich 2.5 M in hexanes , 478 mL, 1.19 mol, 1.09 eq) was added via a dropping funnel over 1 hour while maintaining the internal reaction temperature between -67 ¡ãC and -76 ¡ãC. The resulting orange-red solution was allowed to gradually warm to room temperature for about 15 hours. The reaction mixture was then recooled to 0 ¡ãC and quenched with 500 mL of water. Diethyl ether (2L) was added and the layers were separated. The aqueous layer was extracted with 1 L of diethyl ether. The combined organic layers was washed with water and brine, dried with MgSO4, filtered, and concentrated in vacuo to provide 480 g of an orange oil. This material was left under vacuum for about 15 hours to provide 420 g of oil (mixture of Int-23c and Int-23c’). The crude product was split into two batches and purified via silica gel chromatography on a 1.6 Kg flash column. The column was eluted with gradient of 0-4percent Et2O in hexanes. The product fractions were concentrated in vacuo at a bath temperature at or below 40 ¡ãC to provide 190 grams of Compound Int-25c-(60percent yield).

According to the analysis of related databases, 109838-85-9, the application of this compound in the production field has become more and more popular.

Reference:
Patent; Merck Sharp & Dohme Corp.; Nair, Anilkumar Gopinadhan; Keertikar, Kerry M.; Kim, Seong Heon; Kozlowski, Joseph A.; Rosenblum, Stuart; Selyutin, Oleg B.; Wong, Michael; Yu, Wensheng; Zeng, Qingbei; EP2545060; (2015); B1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

4744-50-7, name is 2,3-Pyrazinecarboxylic anhydride, 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

Example 10: Pyratzetajne-2,3-dicarboxylic arid mono-((3S,4aR,6aR,6bS,8aS, 11S, 12aR, 14aR, 14bS)-11-methoxycarbonyl-4,4,6a,6b,8a, 11, 14b-heptamethyl-14-oxo-1 ,2,3,4,4a, 5, 6,6a,6b,7, 8, 8a,9, 10, 1 1, 12, 12a, 14, 14a, 14b-icosahydro-picen-3-yl) ester (YP034JGlycyrrhetinic acid methyl ester (1.0 g, 2.0 mmol) was stirred in toluene (25 ml) and 2,3-pyrazine-dicarboxylic anhydride (1.7 g, 11.5 mmol) added. The mixture was heated at 110C for 16-20 hours. After cooling, the mixture was added to water (200 ml) and extracted into /-propyl acetate (3 x 70 ml), which was dried (MgSO4) and concentrated to give the crude adduct. Purification was effected using silica chromatography (eluent: 0-10% methanol in DCM) to give the title compound as a yellow solid (500 mg). LCMS purity 90.5% (633 = [M-H] ).1H NMR (400MHz, CDCl3) delta 8.78 (IH, br), 8.70 (IH, br), 5.68 (IH, s) 4.88 (IH, dd, J = 11.6Hz, 4.8Hz), 3.62 (3H, s), 2.80 (IH, br d), 2.35 (IH, s), 2.1-0.6 (4OH, m).

The synthetic route of 4744-50-7 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; YORK PHARMA PLC; WO2007/105015; (2007); A2;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Related Products of 123-32-0, 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. 123-32-0, name is 2,5-Dimethylpyrazine belongs to Pyrazines compound, it is a common compound, a new synthetic route is introduced below.

A solution of m-CPBA (70% purity, 100.0 g, 405.63 mmol) in ethyl acetate (150 mL) was washed with brine (150 mL). The organic layer was separated, dried over MgSO4 and filtered. The filtrate was added to a solution of 2,5-dimethylpyrazine 2 (20.20 mL, 184.94 mmol) in ethyl acetate (50 mL) and the resulting solution was stirred for 24 h at rt. The white solid precipitated was filtered, washed by ethyl acetate (3×100 mL) and dried to give the title compound 6 (23.5 g, 90%) as a white crystalline solid. M.p.: 286 C (dec.).1 1H MNR (200 MHz, D2O): d 8.48 (s, 2H), 2.42 (s, 6H). 13C MNR (50 MHz, D2O): d 145.8, 136.0, 13.7. HRMS (DCI+CH4) Calcd. for C6H9N2O2 [M+H]+: 141.0664. Found: 141.0674.

The synthetic route of 2,5-Dimethylpyrazine has been constantly updated, and we look forward to future research findings.

Reference:
Article; Das, Sajal Kumar; Frey, Joseph; Tetrahedron Letters; vol. 53; 30; (2012); p. 3869 – 3872;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem