Tag: M.W=100-200

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. 4774-14-5, name is 2,6-Dichloropyrazine belongs to Pyrazines compound, it is a common compound, a new synthetic route is introduced below. SDS of cas: 4774-14-5

To a solution of tert-butyl azetidin-3-ylcarbamate hydrochloride (LXIII) (2 g, 9.58 mmol) in dry DMF (19.2 mL) was added DIPEA (8.37 ml, 47.9 mmol). To this mixture was added 2,6-dichloropyrazine (LXIV) ( 1.428 g, 9.58 mmol) and the reaction was stirred at 95C for 3 h. The reaction was quenched with water (20 mL) and extracted with EtOAc. The organic layer was dried over anhydrous NaaSO/t, filtered and concentrated. The residue was purified by silica gel column chromatography (40 g) (100% hexanes?hexanes:EtOAc 1 : 1) to yield tert-butyl (l-(6- chloropyrazin-2-yl)azetidin-3-yl)carbamate (LXV) (2.2882 g, 8.04 mmol, 84 % yield) as a white solid. ESIMS found for C12H17CIN4O2 mlz 285.1 (M+H).

The synthetic route of 4774-14-5 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; SAMUMED, LLC.; KC, Sunil Kumar; WALLACE, David Mark; CAO, Jianguo; CHIRUTA, Chandramouli; HOOD, John; (252 pag.)WO2017/23987; (2017); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Synthetic Route of 63286-28-2,Some common heterocyclic compound, 63286-28-2, name is 2-Chloro-3-hydrazinylpyrazine, molecular formula is C4H5ClN4, 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 3: 8-chloro-[1,2,4]triazolo[4,3-a]pyrazine A mixture of 1-(3-chloropyrazin-2-yl)hydrazine (0.90 g, 62 mmol), triethyl orthoformate (2.3 mL), 14 mmol), and dry xylene (15 mL) was refluxed with stirring for 2 h. The mixture was brought to RT, diethyl ether was added and the suspension was filtered. The solid collected was washed with diethyl ether to afford 8-chloro-[1,2,4]triazolo[4,3-a]pyrazine (0.60 g, 62% yield). MS m/z: 155.0 (M+1).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 2-Chloro-3-hydrazinylpyrazine, its application will become more common.

Reference:
Patent; Amgen Inc.; US2010/120774; (2010); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Electric Literature of 6863-73-6, A common heterocyclic compound, 6863-73-6, name is 3-Chloropyrazin-2-amine, molecular formula is C4H4ClN3, 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.

Benzyl alcohol (4.55 g, 42.15 mmol) was added under an inert atmosphere dropwise to a suspension of sodium hydride (1. 01 g, 42.13 mmol, 80%) in N-methylpyrrolidinone. Stirring of the reaction mixture was continued for 30 min. 2-Amino-3-chloropyrazine (Compound I in Scheme 1, 5.0 g, 38.6 mmol) was then added in incrememtal portions and the resultant mixture was heated at 80 C for 24 h. The reaction mixture was subsequently cooled and water (200 mL) was added. The aqueous solution was extracted with EtOAc (2 x 40 mL). The combined organic layers were washed with water (2 x 100 mL), dried (Mg04), and concentrated under reduced pressure to obtain a light brown residue. Addition of cold water to the residue, triggered crystallization of the desired product. The crystals were collected and dried over P2O5 (6.33 g, 82%). 1H-NMR (CDCl3) No. 7. 54 (d, J 3.1 Hz, 1H), 7.45-7. 32 (m, 6H), 5. 38 (s, 2H), 4. 78 (br s, 2H); MS (ESI) 202.2 ([M+H] +)

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; CARDIOME PHARMA CORPORATION; WO2005/34837; (2005); A2;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Synthetic Route of 33332-28-4,Some common heterocyclic compound, 33332-28-4, name is 2-Amino-6-chloropyrazine, molecular formula is C4H4ClN3, 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.

Example 4A 6-(allyloxy)-2-pyrazinamine A mixture of allyl alcohol (0.21 mL, 3.08 mmol) in dioxane (4 mL) was treated with NaH (60percent, 3.08 mmol), stirred for 30 minutes, treated with 2-amino-6-chloropyrazine (200 mg, 1.54 mmol), heated to 140¡ã C. in a Smith Synthesizer for 2200 seconds, and filtered. The filtrate was concentrated and purified by flash column chromatography eluding with hexanes/ethyl acetate (2:1) to provide the desired product (133 mg, 57percent). MS (DCI/NH3) m/z 152.0 (M+H)+; 1H NMR (500 MHz, CD2Cl2) delta 4.75 (m, 2H), 5.24 (m, 1H), 5.37 (m, 1H), 6.05 (m, 1H), 7.50 (s, 1H), 7.53 (s, 1H).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 2-Amino-6-chloropyrazine, its application will become more common.

Reference:
Patent; Lin, Nan-Horng; Li, Gaoquan; Przytulinska, Magdalenna K.; Sowin, Thomas J.; Sullivan, Gerard M.; Tao, Zhi-Fu; Tong, Yunsong; Wang, Le; US2005/215556; (2005); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Electric Literature of 36070-75-4,Some common heterocyclic compound, 36070-75-4, name is 5-Chloropyrazine-2-carbonitrile, molecular formula is C5H2ClN3, 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.

EXAMPLE 56 5-{(3 ?)-3-[(5-fluoro-6-methoxy-2-pyrazolo[1 ,5-a]pyridin-3-ylpyrimidin-4- yl)amino]piperidin-1 -yl}pyrazine-2-carbonitrile A mixture of (R)-5-fluoro-6-methoxy-N-(piperidin-3-yl)-2-(pyrazolo[1 ,5-a]pyridin-3- yl)pyrimidin-4-amine dihydrochloride (Example 42b, 0.054 g, 0.13 mmol), 2-chloro-5- cyanopyrazine (0.054 g, 0.38 mmol) and potassium carbonate (0.090 g, 0.65 mmol) in N,N-dimethylformamide (1.0 mL) was heated in a microwave at 120 C for 1 hours. The reaction mixture was cooled to ambient temperature and ethyl acetate (10 mL) was added. The solution was washed with water (10 mL) and brine (20 mL). The organic layer was separated, dried over anhydrous magnesium sulfate, filtered, and concentrated under reduced pressure. The residue was taken up in dichloromethane (5 mL), the suspension was filtered and dried in vacuo to give the title compound (0.012 g, 19%) as a pale yellow solid. LRMS (m/z): 446 (M+1 )+. 1H-NMR delta (300 MHz, DMSO-d6): 1.61 – 1.96 (m, 4H), 2.02 – 2.16 (m, 1 H), 2.98 – 3.22 (m, 2H), 4.07 (s, 3H), 4.10 – 4.24 (m, 1 H), 4.42 (d, 1 H), 4.74 (br. s., 1 H), 7.04 (d, 1 H), 7.30 (dd, 2H), 8.37 (d, 1 H), 8.47 (d, 1 H), 8.60 (s, 1 H), 8.81 (d, 1 H).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 5-Chloropyrazine-2-carbonitrile, its application will become more common.

Reference:
Patent; ALMIRALL, S.A.; ESTEVE TRIAS, Cristina; TALTAVULL MOLL, Joan; GONZALEZ RODRIGUEZ, Jacob; VIDAL JUAN, Bernat; (159 pag.)WO2016/198663; (2016); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Application of 186534-02-1, 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. 186534-02-1 name is 3,5,6-Trimethylpyrazine-2-carbaldehyde, 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.

General procedure: New a, b-unsaturated carbonyl-based compounds (5a-g and 6au)were synthesized using direct coupling technique [40] (Scheme 1). The reaction was carried out using base-catalyzed Claisen-Schmidt condensation reaction, by reacting different types of ketoneswith appropriate aromatic aldehyde at molar ratio 2:1 tosynthesize new compounds (5a-g) and at molar ratio 1:1 for (6a-u).For synthesis of 6a-u first 5a-g intermediates were synthesized andin second step appropriate aldehydes were reacted with intermediates.The detailed method of synthesis has already beenreported by us previously [38,40]. Scheme 1 shows the highlights ofsynthesis of compound 3, 4 and a, b-unsaturated carbonyl-basedcompounds along with oxime derivatives. 15 mL ethanol wastaken in a round bottom flask and aromatic aldehyde (20 mmol, 2equivalent) and specific ketone (10 mmol,1 equivalent) were addedand dissolved using a stirrer for 2-3 min at 5 C. Into the abovesolution, 40% NaOH solution in ethanol was added drop wise andthe mixture was stirred for 1-24 h at 27 C. The color change andprecipitate formation in the reaction mixture showed productformation. TLC was used to monitor the reaction and acidified icewas added to quench the reaction once completed. The isolation ofcompounds was done by recrystallization and/or by using columnchromatography.

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 3,5,6-Trimethylpyrazine-2-carbaldehyde, and friends who are interested can also refer to it.

Reference:
Article; Zha, Gao-Feng; Qin, Hua-Li; Youssif, Bahaa G.M.; Amjad, Muhammad Wahab; Raja, Maria Abdul Ghafoor; Abdelazeem, Ahmed H.; Bukhari, Syed Nasir Abbas; European Journal of Medicinal Chemistry; vol. 135; (2017); p. 34 – 48;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Adding a certain compound to certain chemical reactions, such as: 33332-28-4, name is 2-Amino-6-chloropyrazine, 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 33332-28-4, Recommanded Product: 2-Amino-6-chloropyrazine

(b) N-(6-Chloro-pyrazin-2-yl)-4-hydroxy-2-methyl-2H-1,2-benzothiazine-3-carboxamide-1,1-dioxide This compound was prepared from 4-hydroxy-2-methyl-N-methyl-2H-1,2-benzothiazine-3-carboxamide-1,1-dioxide, 2-amino-6-chloro-pyrazine and p-toluenesulfonic acid analogous to Example 14. Yield: 68percent of theory. Melting point: 278¡ã-279¡ã C. (decomposition). C14 H11 ClN4 O4 S (366.79): Calc.: C–45.84percent; H–3.03percent; Cl–9.67percent; N–15.28percent; S–8.74percent. Found: C–45.61percent; H–3.14percent; Cl–9.71percent; N–15.02percent; S–8.58percent.

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 2-Amino-6-chloropyrazine, and friends who are interested can also refer to it.

Reference:
Patent; Dr. Karl Thomae Gesellschaft mit beschrankter Haftung; US4533664; (1985); 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. 23688-89-3, name is 6-Chloropyrazine-2-carboxylic acid, This compound has unique chemical properties. The synthetic route is as follows., Recommanded Product: 23688-89-3

6-Chloropyrazine-2-carboxylic acid [CAS RN: 23688-89-3] (565 mg, 3.56 mmol,1.0 eq) was dissolved in 8 mL THF, and CDI (578 mg, 3.56 mmol, 1.0 eq) was added. Then, the reaction mixture was heated to 70C for 2 h. In a separate flask, 1 -(2,2,2-trifluoroethyl)piperidin-4-amine dihydrochloride [Intermediate13] (936 mg, 3.67 mmol, 1.03 eq) was dissolved in THF and triethylamine (1.02 mL, 7.34 mmol, 2.06 eq) was added. Then, this solution was added to thesolution of the preformed imidazolide and the reaction mixture was heated again to 70C for 2 h. The volatile components were removed in vacuo and the crude material, was purified via preparative MPLC (Biotage Isolera; 25 g SNAP cartridge: hexane -> hexane/ethyl. acetate 2/1) to give 558 mg (44% yield of theory) of the title compound.UPLC-MS (Method 1): R = 0.95 mm; MS (EI0): m/z = 323 [M+H].1H-NMR (400 MHz, DMSO-d6): oe [ppm] = 1.63-1.79 (m, 4H), 2.43 (m, 2H), 2.92 (m, 2H), 3.16 (q, 2H), 3.80 (m, 1H), 8.70 (d, 1H), 8.99 (s, 1H), 9.10 (s, 1H).

According to the analysis of related databases, 23688-89-3, the application of this compound in the production field has become more and more popular.

Reference:
Patent; BAYER PHARMA AKTIENGESELLSCHAFT; BAeRFACKER, Lars; SIEMEISTER, Gerhard; HEINRICH, Tobias; PRECHTL, Stefan; STOeCKIGT, Detlef; ROTTMANN, Antje; WO2015/113927; (2015); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Electric Literature of 77112-53-9,Some common heterocyclic compound, 77112-53-9, name is Imidazo[1,2-a]pyrazine-2-carboxylic acid, molecular formula is C7H5N3O2, 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.

Under Ar protection, triethylamine (13.1g, 0.12mol) slowly at 0-5 C was added dropwise a toluene solution of compound 85, and stirred for 30 minutes, slowly added diphenylphosphoryl azide ester (23.61g, 85.79mmol), plus complete slowly warmed to room temperature and stirred for 3 h, then slowly added t-butanol (in 50.0 mL), and the mixture was heated to 80 C, stirred overnight, cooled to room temperature, the reaction mixture under reduced pressure concentrated to dryness and the residue dissolved in ethyl acetate, the organic phase was washed three times with saturated NaCl solution, dried over anhydrous Na2SO4Dried, filtered, and evaporated to dryness and the residue was separated by column chromatography (ethyl acetate: petroleum ether = 1: 4-1: 2) to give compound 86 as a white solid, a total of 5.54g (23.58mmol), a yield of 55.0%.

The synthetic route of 77112-53-9 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Chinese Academy of Sciences, Shanghai Institute of Medicine; Nanjing Changao Pharmaceutical Technology co., LTD; YANG, YU SHE; CAO, XU FENG; LI, ZHAN; LI, WEI; (78 pag.)CN103965194; (2016); B;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Some common heterocyclic compound, 870787-06-7, name is 3-(Trifluoromethyl)pyrazine-2-carboxylic acid, molecular formula is C6H3F3N2O2, 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. Application In Synthesis of 3-(Trifluoromethyl)pyrazine-2-carboxylic acid

To 74 mg of 3-(trifluoromethyl)pyrazine-2-carboxylic acid in 3 ml of dichloromethane, 10 mg of N,N-dimethylformamide and 57 mg of oxalyl chloride were added, and the mixture was stirred at room temperature for 1 hour. After completion of the reaction, the solvent was evaporated under reduced pressure, and the resulting residue was dissolved in 10 ml of dichloromethane. To the solution, 89 mg of 2-amino-1-(3,5-dichloropyridin-2-yl)ethanone-O-(tert-butyl)oxime and 39 mg of triethylamine were added with stirring under cooling with ice, and the mixture was stirred at room temperature for another 1 hour. After completion of the reaction, the reaction mixture was mixed with 10 ml of water and extracted with chloroform (10 ml*1), the resulting organic layer was dried over saturated aqueous sodium chloride and then anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The resulting residue was purified by silica gel column chromatography using ethyl acetate-hexane (with a gradient of from 1:9 to 3:7) as the eluent to obtain 22 mg of geometrical isomer A and 111 mg of geometrical isomer B of the desired product as colorless resinous substances.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 870787-06-7, its application will become more common.

Reference:
Patent; Nissan Chemical Industries, Ltd.; IWASA, Motoyoshi; TSUJI, Keisuke; TOMIZAWA, Mitsutaka; MITA, Takeshi; KUWAHARA, Hidehito; ASAHI, Miho; IMANAKA, Hotaka; EP2873658; (2015); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem