Tag: M.W=100-200

Reference of 123-32-0,Some common heterocyclic compound, 123-32-0, name is 2,5-Dimethylpyrazine, molecular formula is C6H8N2, 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, 5-dimethylpyrazine (6 g, 55.6 mmol), carbon tetrachloride (50 mL) were added in a three-necked flask,After stirring, N-chlorosuccinimide (NCS) (7. 4 g, 55.6 mmol) and benzoyl peroxide(0. 05 g, 0.21 mmol),The reaction mixture was irradiated under incandescent light,Stir,Reflux reaction about 18h,TLC [V (ethyl acetate): V (petroleum ether) = 1: 2 as developing solvent] After the detection reaction is substantially complete,The reaction solution was cooled to 0 C,After standing for 1 hour,filter,The filter cake is washed with cold carbon tetrachloride,Combined filtrate and wash solution,Vacuum distillation of carbon tetrachloride,Get a light brown oil,Methylene chloride dissolved,After decolorization of activated carbon,Pale yellow oil,Without further direct reaction to the next step.

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

Reference:
Patent; Anhui University of Chinese Medicine; Hefei Industrial Pharmaceutical Institute Co., Ltd.; Li, JiaMing; He, GuangWei; Hu, MinHua; Huang, WeiJun; Zhu, Xiaoyu; Wang, Jie; Ye, WenFeng; Zhang, EnLi; (10 pag.)CN103664804; (2016); B;,
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. 6863-74-7, name is 6-Chloropyrazine-2-carbonitrile, A new synthetic method of this compound is introduced below., Safety of 6-Chloropyrazine-2-carbonitrile

To a suspension of Raney-Ni (307 mg, 3.59 mmol,) in EtOH (20 ml_) was added 6- chloropyrazine-2-carbonitrile (1 .00 g, 7.17 mmol,) and terf-butoxycarbonyl tert-butyl carbonate (1 .72 g, 7.88 mmol), then the reaction mixture was stirred at room temperature under H2(45psi) for 16 hours. The reaction mixture was filtered through celite and the filtrate was concentrated under reduced pressure to give a residue. The residue was purified by flash silica gel chromatography (eluention with 0-10% Ethyl acetatertetroleum ether gradient) to give tert-butyl N-[(6-chloropyrazin-2-yl)methyl]carbamate (1 .05 g).

The synthetic route of 6863-74-7 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; H. LUNDBECK A/S; KEHLER, Jan; JUHL, Karsten; MARIGO, Mauro; VITAL, Paulo, Jorge, Vieira; JESSING, Mikkel; LANGGARD, Morten; RASMUSSEN, Lars, Kyhn; CLEMENTSON, Carl, Martin, Sebastian; (270 pag.)WO2018/7249; (2018); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Related Products of 20737-42-2, 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 20737-42-2 as follows.

STEP 2. 3-CHLORO-PYRAZTNE-2-CARBONYL CHLORIDE; [00202 ] 3 -Hydroxy -pyrazine-2-carboxylic acid (154 mg, 1.1 mmol) was dissolved in phosphorus oxy chloride (2 ml) followed by adding one drop of pyridine. The mixture was heated to reflux for 2h. After that, the reaction solution was concentrated under reduced pressure to give 3-chloropyrazine-2-carboxylic acid chlori

According to the analysis of related databases, 20737-42-2, the application of this compound in the production field has become more and more popular.

Reference:
Patent; AMGEN INC.; ALLEN, Jennifer R.; ANDREWS, Kristin L.; FROHN, Michael J.; HARRINGTON, Paul E.; PICKRELL, Alexander J.; RZASA, Robert M.; WO2011/143129; (2011); 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. 56423-63-3, name is 2-Bromopyrazine, A new synthetic method of this compound is introduced below., Quality Control of 2-Bromopyrazine

To a reaction flask were added compound 21 (100 mg, 0.186 mmol), 2-bromopyrazine (50 mg, 0.279 mmol), Pd(dppf)Cl2 (5 mg, 0.006 mmol) and sodium carbonate (60 mg, 0.558 mmol), 5 mL glycol dimethyl ether and 0.9 mL water were added, bubbled with nitrogen gas for 10 minutes, and the reaction was heated to 100 C in microwave and reacted for half an hour. After TLC detected the reaction was complete, the reaction was concentrated, purified by silica gel column chromatography to afford 72 mg of a product, yield: 79.1%. LC-MS(APCI): m/z = 489.7 (M+1)+. 1H NMR (400 MHz, CDCl3) delta 8.77 (d, J = 2.2 Hz, 1H), 8.71 (s, 1H), 8.63 (s, 1H), 8.52 (d, J = 2.4 Hz, 1H), 8.09 (d, J = 2.3 Hz, 1H), 8.00 (s, 1H), 7.69 (d, J = 9.0 Hz, 2H), 7.23 (d, J = 8.8 Hz, 2H), 3.45 – 3.36 (m, 1H), 3.27 (dt, J = 20.1, 8.5 Hz, 3H), 2.75 – 2.66 (m, 1H), 2.23 (s, 6H), 2.06 (dd, J = 11.1, 5.1 Hz, 1H), 1.85 – 1.74 (m, 1H).

The synthetic route of 56423-63-3 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Shenzhen Targetrx, Inc.; WANG, Yihan; ZHAO, Jiuyang; AL, Yixin; (55 pag.)EP3553056; (2019); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Reference of 36070-80-1, A common heterocyclic compound, 36070-80-1, name is 5-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.

Example 56 2 (R)- (3-CHLORO-4-METHANESULFONYL-PHENYL)-3-CYCLOPENTYL-N- [5- (2-HYDROXY-1- HYDROXYMETHYL-ETHOXY)-PYRAZIN-2-YL]-PROPIONAMIDE [000288] A suspension of 5-chloro-pyrazine-2-carboxylic acid (prepared as in Example 29,1. 00 g, 6.33 mmol) in methylene chloride (30 mL) was treated with 1,3- dibenzyloxy-2-propanol (2.06 g, 7.57 MMOL), bis (2-oxo-3-oxazolidinyl) phosphinic chloride (1.61 g, 6.34 mmol), and triethylamine (1.83 mL, 12.66 mmol). The mixture was stirred at 25C overnight. The solution was extracted with methylene chloride and a saturated sodium bicarbonate solution. The organic layer was washed with water, a saturated aqueous sodium chloride solution, a 1N hydrochloric acid solution and a saturated aqueous sodium chloride solution. The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40L, Silica, 3/1 hexanes/ethyl acetate) afforded the 5-chloropyrazine-2-carboxylic acid 2- BENZYLOXY-1-BENZYLOXYMETHYL-ETHYL ester (1.45 g, 55.7%) as a colorless oil.

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

Related Products of 14399-37-2, A common heterocyclic compound, 14399-37-2, name is 3,6-Dichloropyrazin-2-amine, molecular formula is C4H3Cl2N3, 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.

Stage A: preparation of 5,8-dichlorimidazo[1,2-a]pyrazine This derivative is obtained according to a technique identical to that of Example 1, stage A, by replacing 2-aminopyrazine by 2-amino-3,6-dichloropyrazine. 2.4 grams (18.6 mmol) of this compound yield 1 g (Yld=37%) of 5,8-dichloroimidazo[1,2-a]pyrazine (m.p. 102 C.).

The synthetic route of 14399-37-2 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; l’Universite de Montpellier I; US5028605; (1991); A;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Related Products of 91476-80-1, 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.

5,6,7,8-Tetrahydroimidazo[1 ,2-a]pyrazine (0.099 g, 0.804 mmol) was suspended in dichloromethane (DCM) (8 ml). Triethylamine (0.123 ml_, 0.884 mmol) and 2-chloro- 3-(trifluoromethyl)benzoyl chloride (0.195 g, 0.804 mmol) were added and the mixture was stirred at room temperature for 5 hours. The reaction mixture was concentrated in vacuo, the residue dissolved in 1 :1 DMSO/MeOH and purified by mass-directed automated preparative HPLC. Product fractions were concentrated in vacuo to yield an orange gum. This was partitioned between DCM (10ml) and saturated aqueous sodium bicarbonate (4ml) and the organic layer separated. This was concentrated in vacuo to yield 7-{[2-chloro-3-(trifluoromethyl)phenyl]carbonyl}- 5,6,7,8-tetrahydroimidazo[1 ,2-a]pyrazine (0.131 g, 0.397 mmol, 49.4 % yield) as a yellow gum. LC/MS [M+H]+ = 330, retention time = 1.02 minutes (5 minute method).

The chemical industry reduces the impact on the environment during synthesis 5,6,7,8-Tetrahydroimidazo[1,2-a]pyrazine. I believe this compound will play a more active role in future production and life.

Reference:
Patent; GLAXO GROUP LIMITED; DEAN, David Kenneth; MUNOZ-MURIEDAS, Jorge; SIME, Mairi; STEADMAN, Jon Graham Anthony; THEWLIS, Rachel Elizabeth Anne; TRANI, Giancarlo; WALL, Ian David; WALTER, Daryl Simon; WO2010/125101; (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. 4774-14-5, name is 2,6-Dichloropyrazine, This compound has unique chemical properties. The synthetic route is as follows., Formula: C4H2Cl2N2

(1) To a solution of diisopropylamine (0.78 g) in tetrahydrofuran (40 ml) is dropped a 1.6M solution of n-butyl lithium in hexane (4.82 ml) over a period of 3 minutes under cooling on dry ice in acetone bath. The mixture is stirred on the same bath for 30 minutes and thereto is added 2,6-dichloropyrazine 0.50 g in tetrahydrofuran 5 ml at the same temperature over a period of 15 minutes. After stirring for 1 hour, the mixture is poured into dry ice and stirred at room temperature for 1 hour. The mixture is diluted with 10% hydrochloric acid to be adjusted pH about 2 and extracted with ethyl acetate. The combined organic layer is extracted with an aqueous saturated sodium hydrogen carbonate solution. The water extract is washed with ethyl acetate and made acid with a 10% aqueous hydrochloric acid solution and extracted with ethyl acetate. The combined organic layer is washed with water and an aqueous saturated sodium chloride solution, dried over sodium sulfate and concentrated in vacuo. The residue is titrated with chloroform-hexane (1:1) to give 2-carboxy-3,5-dichloropyrazine 234 mg as a slightly brownish crystalline powder. mp 139-141 C., MS(m/z): 191 (M-H)-

According to the analysis of related databases, 4774-14-5, the application of this compound in the production field has become more and more popular.

Reference:
Patent; Yamada, Koichiro; Matsuki, Kenji; Omori, Kenji; Kikkawa, Kohei; US2004/142930; (2004); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Reference of 5521-55-1, A common heterocyclic compound, 5521-55-1, name is 5-Methylpyrazine-2-carboxylic acid, molecular formula is C6H6N2O2, 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 1. tert-butyl 5-methylpyrazin-2-ylcarbamate To solution 5-methylpyrazine-2-carboxylic acid (2.5 g, 18.1 mmol), tert-butanol (6.92 mL, 72.4 mmol), Et3N (3.78 mL, 27.1 mmol) in 1,4-dioxane (12.5 mL) at 95 C. was dropwise added diphenylphosphoryl azide (DPPA, 3.23 mL, 18.1 mmol), and the reaction was heated at 95 C. for 1.5 h, followed by a 2nd portion of DPPA (1 mL, 5.6 mmol) and heated for additional 1.5 h. The reaction mixture was cooled down, concentrated and the residue was diluted with EtOAc (50 mL), washed with water (30 mL), 3 M NaOH (30 mL), sat. NaHCO3 (30 mL) and brine (30 mL), dried over Na2SO4, and concentrated. The residue was purified by flashed chromatography on silica gel eluting with gradient EtOAc/CH2Cl2 (0-20%) to afford tert-butyl 5-methylpyrazin-2-ylcarbamate as white solid. LCMS (m/z): 210.1 (MH+), 0.69 min; 1H NMR (400 MHz, CDCl3) delta ppm 9.17 (s, 1H), 8.09 (s, 1H), 7.75 (br. s., 1H), 2.51 (s, 3H), 1.56 (s, 9H).

The synthetic route of 5521-55-1 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Novartis AG; Bagdanoff, Jeffrey T.; Ding, Yu; Han, Wooseok; Huang, Zilin; Jiang, Qun; Jin, Jeff Xianming; Kou, Xiang; Lee, Patrick; Lindvall, Mika; Min, Zhongcheng; Pan, Yue; Pecchi, Sabina; Pfister, Keith Bruce; Poon, Daniel; Rauniyar, Vivek; Wang, Xiaojing Michael; Zhang, Qiong; Zhou, Jianguang; Zhu, Shejin; (366 pag.)US9242996; (2016); B2;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem

Reference of 4858-85-9, 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.

A 100 mL round bottom flask was charged with 2,3-dichloropyrazine (10 g, 67.6 mmol), hydrazine hydrate (6.76 g, 135 mmol) and ethanol (40 mL). The resulting mixture was stirred at reflux for 3 h. Reaction progress was monitored by TLC (EtO Ac/petroleum ether = 2:1). Work-up: the reaction mixture was cooled to room temperature. The solid was collected by filtration, washed with water (30 mL x 2) and dried, to afford 8.4 g (87%) of the product as a yellow solid.

The chemical industry reduces the impact on the environment during synthesis 2,3-Dichloropyrazine. I believe this compound will play a more active role in future production and life.

Reference:
Patent; KALYPSYS, INC.; BORCHARDT, Allen; DAVIS, Robert; NOBLE, Stewart, A.; WO2011/112766; (2011); A2;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem