Tag: M.W=100-200

Reference of 233278-56-3, The chemical industry reduces the impact on the environment during synthesis 233278-56-3, name is 5,6,7,8-Tetrahydro[1,2,4]triazolo[1,5-a]pyrazine, I believe this compound will play a more active role in future production and life.

Description 35: 3-(5,6-Dihydro[1,2,4]triazolo[1,5-a]pyrazin-7(8H)-ylmethyl)-2-phenylquinoline-4-carboxylic Acid A mixture of 3-(bromomethyl)-2-phenylquinoline-4-carboxylic acid (Description 5, 3.4 g, 10.3 mmol), 5,6,7,8-tetrahydro-[1,2,4]triazolo[1,5-a]pyrazine (1.24 g, 9.1 mmol) and triethylamine (1.39 mL, 1.01 g, 10 mmol) in DMF (50 mL) was heated at 60 C. for 40 h. The mixture was cooled and the solvent was evaporated under reduced pressure. EtOAc (500 mL) was added and the mixture was heated to reflux, filtered and cooled. The solvent was evaporated under reduced pressure to a volume of 100 mL and the solid was collected and dried in vacuo to give the title compound as a solid (1.0 g, 28%). m/z (ES+) 386 [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, 5,6,7,8-Tetrahydro[1,2,4]triazolo[1,5-a]pyrazine, other downstream synthetic routes, hurry up and to see.

Some common heterocyclic compound, 59489-71-3, name is 2-Amino-5-bromopyrazine, molecular formula is C4H4BrN3, 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. Recommanded Product: 59489-71-3

Preparation 10: 2-Bromo-5-iodopyrazineTo a solution of 5-bromopyrazin-2-amine (25.95 g, 147.13 mmol) in 1 ,2-dimethoxyethane (500 ml_) was added cesium iodide (38.75 g, 147.13 mmol), copper (I) iodide (8.52 g, 44.74 mmol) and iodine (18.93 g, 74.57 mmol). Isoamyl nitrite (120 ml_, 894.8 mmol) was then added dropwise via a dropping funnel and the reaction mixture was heated at 60 C for 1 hour. After this time, the mixture was cooled to room temperature and diluted with ethyl acetate (200 ml_), washed with ammonium chloride (sat. aq .200 ml_), then sodium thiosulphate (sat. aq.3 x 200 ml_). The organic layer was dried over MgS04, filtered and the solvent was evaporated under reduced pressure. The crude product was purified by silica column (heptane : ethyl acetate, 100:0 to 85:15) to give the title compound as a off-white solid (35.38 g).LCMS (run time = 5 minutes, System D): Rt = 2.09 minutes.H NMR (400 MHz, CDCI3): delta = 8.65 (s, 1 H), 8.50 (s, 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 59489-71-3, its application will become more common.

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. 122-05-4, name is Pyrazine-2,5-dicarboxylic acid, A new synthetic method of this compound is introduced below., Recommanded Product: 122-05-4

General procedure: 3.1.1.12; 2,5-Bis[6-(4,5-dihydro-1H-imidazol-2-yl)1,3-benzothiazol-2-yl]pyrazine dihydrochloride (3l) To a solution of the free base prepared by method A in acetic acid (40 mL) concd HCl (2.0 mL) was added and stirred for 2 h. The resulting precipitate was filtered off, washed with acetone and dried. Crystallization from water/1 M HCl/acetone mixture gave pure compound 3l 136 mg (46.0%) as yellow solid: mp > 300 C. 1H NMR (300 MHz, DMSO-d6) (delta ppm): 10.65 (br s, 4H, H-Amd), 9.70 (s, 2H, H-Pyr), 8.86 (d, 2H, J = 1.4 Hz, H-Bt), 8.48 (d, 2H, J = 8.7 Hz, H-Bt), 8.10 (dd, 2H, J = 1.5 Hz, J = 8.6 Hz, H-Bt), 4.06 (s, 8H, H-CH2). LC-MS (ESI) m/z: 483.3 [(M + H+) calcd for free base C24H18N8S2, 482.11]. Analysis calcd for C24H20Cl2N8S2 * 2H2O (591.54): C, 48.73; H, 4.09; N, 18.94, Cl, 11.99. Found C, 48.91; H, 4.05; N, 18.94; Cl, 11.72%.

The synthetic route of 122-05-4 has been constantly updated, and we look forward to future research findings.

Synthetic Route of 14508-49-7, 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. 14508-49-7, name is 2-Chloropyrazine belongs to pyrazines compound, it is a common compound, a new synthetic route is introduced below.

A flame dried and cooled 100 mL round bottom flask was charged with 2,2,6,6-tetramethylpiperidine (2.5 mL, 14.96 mmol) and anhydrous THF (25 mL) under a nitrogen atmosphere. The contents were cooled to -78 C. and n-butyllithium (2.5 M in hexane, 5.7 mL, 14.28 mmol) was added dropwise over a 5 minute period. The reaction mixture was stirred at -78 C. for 5 minutes, bought to 0 C. and stirred at 0 C. for 25 minutes. The reaction mixture was recooled to -78 C. and 2-chloropyrazine (0.78 g, 1 mL, 6.8 mmol) was added over a 3 minute period. After 30 minutes at -78 C., anhydrous DMF (0.99 mL, 13.6 mmol) was added over 3 minutes and the contents stirred at -78 C. for a further 30 minutes. The reaction mixture was bought to 0 C., stirred at 0 C. for 15 minutes, recooled to -78 C. and quenched by the addition of acetic acid (4 mL) in THF (10 mL). The reaction mixture was stirred at room temperature for 10 minutes and partitioned between ethyl acetate (60 mL) and brine (30 mL). The ethyl acetate layer is separated, dried over sodium sulfate, concentrated under reduced pressure and purified by silica gel flash chromatography using dichloromethane and ethyl acetate (9.5:0.5, 400 mL) to yield the title compound a (950 mg). 1H-NMR of the compound was consistent with the desired structure.

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

Synthetic Route of 68236-03-3, 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. 68236-03-3, name is 6-Chloropyrido[2,3-b]pyrazine belongs to pyrazines compound, it is a common compound, a new synthetic route is introduced below.

Intermediate 4.3 : 6-Vinvl-pyrido[2.3-blpyrazine (Scheme 10); 6-chloropyrido[2,3-b]pyrazine (Intermediate 4.2) (3 g, 18.12 mmol, 1.00 eq.) was dissolved in THF (150mL) and degassed with nitrogen at rt for 10 minutes. Tetrakis (triphenylphosphine) palladium(O) (1.46 g, 1.27 mmol, 0.07 eq.) and vinyltributylstannane (7.47 mL, 23.5 mmol, 1.3eq.) were added and reaction mixture was stirred at 65C for 3 hours. THF was evaporated and crude purified directly by flash chromatography using cyclohexane/ethyl acetate (8/2) to give 2.3 g of the expected compound (Intermediate 4.3) as an orange oil. Amount: 2.3g; Yield: 81%; Formula: C9H7N3; HPLC Purity: 98%; HPLC (HzO TFA 0.1%-ACN TFA Q.05%): Rt (min); Area % = 1.32 min; 98%; 1H NMR (DMSO-d6) 8 9.10 (s, 1H), 8.98 (s, 1H), 8.46 (d, 1H, J=8Hz), 7.95 (d, 1H, J= 8Hz), 6.90 (dd, 1H, Jtrans^HHz, Jcis= 10Hz), 6.50 (dd, 1H, Jt^nHz, Jgem=1.5Hz), 5.80 (dd, 1H, Jcis=10Hz, Jgem=1.5Hz). LC-MS:M/ZESI: Rt (min) 0.78 min, 158.13 (M+l).

The synthetic route of 6-Chloropyrido[2,3-b]pyrazine has been constantly updated, and we look forward to future research findings.

Reference of 768-05-8, These common heterocyclic compound, 768-05-8, name is Pyrazinoic acid hydrazide, 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.

Compound 5a (150 mg, 515.87 [mu] mol)And pyrazinohydrazide (75.06 mg, 515.87 [mu] mol) were added to the reaction flask,Add 2 mL of ethanol,Room temperature reaction,TLC monitoring reaction was carried out.After the reaction,There is a lot of solid precipitation.Direct suction filter,Get cake.The cake was dried in an oven at 60 C for 6 h to obtain pure compound 6j.Yellow solid.Yield 90%.

Statistics shows that Pyrazinoic acid hydrazide is playing an increasingly important role. we look forward to future research findings about 768-05-8.

Adding a certain compound to certain chemical reactions, such as: 22047-25-2, name is Acetylpyrazine, 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 22047-25-2, HPLC of Formula: C6H6N2O

General procedure: A 100 mL round-bottom flask charged with 2-acetylpyrazine (1.47 g, 2 mmol) was added MeOH (30 mL), KOH pellets (0.675 g,2 mmol) and water (2 mL). The resulting mixture was stirred for10 min and then added corresponding n,n?-dimethoxybenzaldehydes (1.0 g, 1 mmol) and ammonium solution (6 mL) was added slowly stirring at room temperature for 4 h, a white precipitate obtained was filtered, washed with MeOH and diethyl ether. The crude products on recrystallization in a mixture of CHCl3:MeOH (1:1) gave white crystals of desired compounds, 1-4.

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, Acetylpyrazine, other downstream synthetic routes, hurry up and to see.

Application of 55557-52-3, These common heterocyclic compound, 55557-52-3, name is 3-Chloropyrazine-2-carbonitrile, 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). (3-Chloropyrazin-2-yl)methanamine hydrochloride was prepared as follows. To a solution of 3-chloropyrazine-2-carbonitrile (160 g, 1 .147 mol) in acetic acid (1.5 L) was added Raney Nickel (50% slurry in water, 70 g, 409 mmol). The resulting mixture was stirred under 4 bar hydrogen at room temperature overnight. Raney Nickel was removed by filtration over decalite and the filtrate was concentrated under reduced pressure and co-evaporated with toluene. The remaining brown solid was dissolved in ethyl acetate at 50C and cooled on an ice-bath. 2M hydrogen chloride solution in diethyl ether (1 .14 L) was added in 30 min. The mixture was allowed to stir at room temperature over weekend. The crystals were collected by filtration, washed with diethyl ether and dried under reduced pressure at 40C. The product brown solid obtained was dissolved in methanol at 60C. The mixture was filtered and partially concentrated, cooled to room temperature and diethyl ether (1000 ml) was added. The mixture was allowed to stir at room temperature overnight. The solids formed were collected by filtration, washed with diethyl ether and dried under reduced pressure at 40C to give 153.5 g of (3-chloropyrazin-2- yl)methanamine.hydrochloride as a brown solid (74.4 %, content 77 %).

The synthetic route of 55557-52-3 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. 36070-80-1, name is 5-Chloropyrazine-2-carboxylic acid, A new synthetic method of this compound is introduced below., SDS of cas: 36070-80-1

5-Hydroxypyrazine-2-carboxylic acid [CAS RN: 34604-60-9] (500 mg, 3.57 mmol,1.0 eq) was treated with thionyl chloride (3.90 mL, 53.5 mmol, 15 eq) and 0.04 mL DMF. Then, the reaction mixture was heated to reflux temperature for 4 h. On cooling, the volatile components were removed in vacuo. The crude material remaining was diluted with toluene and the resulting solution was concentrated by the use of a rotary evaporator. This procedure was repeated two more times.Then, the remaining material was treated with 4 mL DMF and with 2-methoxy-N- methylethanamine [CAS-RN: 38256-93-8] (795 mg, 8.92 mmol, 2.5 eq). The reaction mixture was stirred at rt overnight. 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 ->ethyl acetate ) to give 290 mg (34% yield of theory) of the title compound.UPLC-MS (Method 1): R = 0.76 mm; MS (EI0): m/z = 230 [M+H].

The synthetic route of 36070-80-1 has been constantly updated, and we look forward to future research findings.

Reference of 36070-80-1, 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. 36070-80-1, name is 5-Chloropyrazine-2-carboxylic acid belongs to pyrazines compound, it is a common compound, a new synthetic route is introduced below.

A resealable reaction vial was charged with 5-chloropyrazine-2-carboxylic acid (500 mg, 3.15 mmol) and sulfurooyl dichloride (5.73 mL, 78.7 mmol). The mixture was charged with DMF (3 drops) and heated to 80 C for 3.5 h. The solvent was removed in vacuo and chased with toluene to give a yellow crystalline solid.

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