Tag: M.W=100-200

Synthetic Route of 186534-02-1, 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. 186534-02-1, name is 3,5,6-Trimethylpyrazine-2-carbaldehyde belongs to pyrazines compound, it is a common compound, a new synthetic route 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.

The synthetic route of 3,5,6-Trimethylpyrazine-2-carbaldehyde has been constantly updated, and we look forward to future research findings.

Some common heterocyclic compound, 89283-32-9, name is (3-Chloropyrazin-2-yl)methanol, molecular formula is C5H5ClN2O, 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: 89283-32-9

2-Chloro-3-chloromethyl-pyrazine: (3-Chloropyrazin-2-yl)-methanol (8.00 g, 0.0553 mol) was dissolved in toluene (40 mL) and N,N-dimethylformamide (2.1 mL, 0.028 mol). The solution was treated dropwise with thionyl chloride (4.44 mL, 0.0609 mol) over 10 min, keeping the temperature at 40 C. during the addition. After 30 min the reaction was quenched with 20 mL water and then solid sodium carbonate (7.7 g, 0.073 mol) was added to give a neutral pH. The mixture was filtered and the toluene layer was separated. The aqueous layer was re-extracted with 25 mL toluene and the combined toluene extracts were washed with water (25 mL). The toluene solution was evaporated to remove water. The product can be used without further purification or if desired purified by distillation at 58 C. (1 Torr) to give the title compound a colorless liquid. 1H NMR (CDCl3, 400 MHz): delta 4.82 (s, 2H), 8.32-8.43 (m, 1H), 8.47-8.57 (m, 1H). m/z [MH+] 163/165/167 (100/60/10).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 89283-32-9, its application will become more common.

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. 939412-86-9, name is (3-Chloropyrazin-2-yl)methanamine hydrochloride, This compound has unique chemical properties. The synthetic route is as follows., COA of Formula: C5H7Cl2N3

(c) (6R,8aS)-N-((3-chloropyrazin-2-yl)methyl)-3-oxo-1-vinylhexahydro-1H-oxazolo[3,4-a]pyridine-6-carboxamide To a solution of (6R,8aS)-3-oxo-1-vinylhexahydro-1H-oxazolo[3,4-a]pyridine-6-carboxylic acid (60 mg, 0.28 mmol) in DCM (5 mL) was added (COCl)2 (54.1 mg, 0.43 mmol) at 0 C. and stirred at 20 C. for 1 h under N2 atmosphere. The mixture was concentrated in vacuo to give the residue, which was dissolved in THF (2 mL) and followed by (3-chloropyrazin-2-yl)methanamine hydrochloride (76.7 mg, 0.43 mmol) and Et3N (86.2 mg, 0.85 mmol). The mixture was stirred at 20 C. for 5 h. TLC (PE: THF=1:1) showed the starting materials was consumed completely. Then the reaction mixture was poured into water (10 mL), extracted with EA (10 mL*2). The organic layer was concentrated in vacuo and purified with pre-TLC to afford (6R,8aS)-N-((3-chloropyrazin-2-yl)methyl)-3-oxo-1-vinylhexahydro-1H-oxazolo[3,4-a]pyridine-6-carboxamide (30 mg, yield 31.4%) as a white solid. 1HNMR (400 MHz, Methanol-d4): delta=8.53 (dd, J=1.0, 2.5 Hz, 1H), 8.34 (d, J=2.0 Hz, 1H), 6.04-5.88 (m, 1H), 5.50-5.31 (m, 2H), 4.65-4.57 (m, 3H), 3.98-3.89 (m, 1H), 3.83 (ddd, J=3.4, 8.2, 11.8 Hz, 1H), 3.50-3.42 (m, 1H), 2.58-2.42 (m, 1H), 2.10 (dd, J=2.5, 12.8 Hz, 1H), 2.03-1.95 (m, 1H), 1.77-1.63 (m, 2H), 1.53-1.38 (m, 111).

According to the analysis of related databases, 939412-86-9, the application of this compound in the production field has become more and more popular.

Related Products of 123-32-0, 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. 123-32-0, name is 2,5-Dimethylpyrazine, This compound has unique chemical properties. The synthetic route is as follows.

Preparation of 3,6-dimethyl-2-benzoylpyrazine, include the following steps: (1) Take 0.2 mmol 2,5-dimethyl pyrazine, 0.4mmol benzoyl formate, silver phosphate 0.02 mmol, 5mL of potassium persulfate was placed 0.4mmol reaction tube, was added 1.4mL of dichloromethane, 0.6 mL of distilled water to form a mixture, and the reaction was placed in an oil bath at 40C reaction was heated 24h, cooled to room temperature to obtain;(2) The step (1) the resulting reaction mixture was directly concentrated to give a concentrate, the concentrate with ethyl acetate / petroleum ether = 1/2 (v / v) as the developing solvent, separation by thin layer chromatography to give 40mg target The product, 95% yield.

The chemical industry reduces the impact on the environment during synthesis 2,5-Dimethylpyrazine. I believe this compound will play a more active role in future production and life.

Adding a certain compound to certain chemical reactions, such as: 6863-74-7, name is 6-Chloropyrazine-2-carbonitrile, 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 6863-74-7, SDS of cas: 6863-74-7

To a suspension of 349 Raney-Ni (307 mg, 3.59 mmol,) in 25 EtOH (20 mL) was added 350 6-chloropyrazine-2-carbonitrile (1.00 g, 7.17 mmol,) and 351 tert-butoxycarbonyl tert-butyl carbonate (1.72 g, 7.88 mmol), then the reaction mixture was stirred at room temperature under H2 (45 psi) 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 010% 56 Ethyl acetate/Petroleum ether gradient) to give 352 tert-butyl N-[(6-chloropyrazin-2-yl)methyl]carbamate (1.05 g).

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, 6-Chloropyrazine-2-carbonitrile, other downstream synthetic routes, hurry up and to see.

Related Products of 54608-52-5, The chemical industry reduces the impact on the environment during synthesis 54608-52-5, name is 2-Hydrazinopyrazine, I believe this compound will play a more active role in future production and life.

Example-4: Preparation of Selinexor (0507) (0508) (Z)-3-(3-(3,5-bis(trifluoromethyl)phenyl)-1 H-1 ,2,4-triazol-1 -yl)acrylic acid (10 g) was combined with a mixture of acetonitrile (1 00 mL) and ethyl acetate (50 mL) then added the 2-hydrazinylpyrazine (3.76 g) and stirred for 5 min. Reaction mixture was cooled to 0C and diisopropyl ethyl amine (16.63 ml) and then Propylphosphonic anhydride (T3P, 33.31 mL) was added at 0C and stirred the reaction mixture for 2.5 hours at the same temperature. After completion of the reaction, the reaction mixture was quenched with cold water (100 mL) and extracted the product with ethyl acetate (2 x 150 mL). The combined organic layer was dried over sodium sulphate and evaporated the solvent under vacuum at 40C to obtain the crude product as yellow syrup. The obtained crude product was combined with dichloromethane (1 00 mL) and filtered the solid and washed with dichloromethane (2 x 50 mL). The solid was dried under vacuum at 40C to obtain the title compound with purity by HPLC of 99.86%. Yield : 7 g

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

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. 16298-03-6, name is Methyl 2-aminopyrazine-3-carboxylate, A new synthetic method of this compound is introduced below., Quality Control of Methyl 2-aminopyrazine-3-carboxylate

Step B. Methyl 3-f [4-(dimethylamino)-1-naphthoyl]amino(at)pyrazme-2-carboxylate; Oxalyl chloride (1.70 mL, 19.5 mmol) was added to a solution of 4-(dimethylamino)- I – naphthoic acid (2.63 g, 12.2 mmol) in DCE (125 mL) at 0°C. The reaction mixture was allowed to warm to ambient temperature, heated to 85°C and stirred for 10 min. The reaction mixture was evaporated to dryness and the red residue was suspended in DCE (30 mL). The resulting suspension was added drop wise via a pump syringe over 7 hrs. to a solution of methyl 3-aminopyrazine-2-carboxylate (1.25 g, 8.16 mmol) and pyridine (4.75 mL, 58.7 mmol) in DCE (125 mL) at 80°C. The reaction mixture was stirred for 10 hrs at 80°C, cooled to ambient temperature and washed with 0.1M HCl solution. The solvent was concentrated and the product was purified on silica gel by MPLC to provide the title compound as white solid (1.24 g, 43 percent)

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.

Related Products of 875781-43-4, 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. 875781-43-4, name is 2-Bromo-5H-pyrrolo[2,3-b]pyrazine belongs to pyrazines compound, it is a common compound, a new synthetic route is introduced below.

Method BSteplIn a dry round-bottomed flask, 2-bromo-5H-pyrrolo[2,3-b]pyrazine (5.0 g, 25.2 mmol) was dissolved in DMF (50 mL). The reaction mixture was cooled to 0C and sodium hydride (60% dispersion in mineral oil, 1.22 g, 30.6 mmol). The reaction mixture was warmed to room temperature and stirred for 15 min then cooled back to 0C and SEM-C1 (5.4 mL, 30.4 mmol) was slowly added. After the addition was complete, the ice bath was removed and the reaction mixture was stirred at room temperature for 1.5 h. The reaction mixture was quenched with 50 mL water and extracted with 150 mL diethyl ether (2x). The combined organic layers were washed twice with 30 mL water and once with 30 mL brine then dried over sodium sulfate, filtered and concentrated. The residue was absorbed on -20 g Si02 and chromatographed over 200g Si02 with EtOAc/Hexanes (gradient: 0-15% EtOAc). All fractions containing product were combined and concentrated to afford 6.61 g (80%) of 2- bromo-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine as a pale yellow oil which gradually solidified.

The synthetic route of 2-Bromo-5H-pyrrolo[2,3-b]pyrazine has been constantly updated, and we look forward to future research findings.

These common heterocyclic compound, 312736-49-5, name is 3,5-Dichloropyrazine-2-carboxylic acid, 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. Recommanded Product: 312736-49-5

To a solution of 55A (10 g, 51.82 mmol) and HATU (21.67 g, 57 mmol) in DMF (50 mL), DIEA (19.86 mL, 1 14 mmol) was added. After 30 minutes, Nu,Omicron-dimethylhydroxylamine hydrochloride (6.09 g, 62.18 mmol) was added to the solution. The mixture was stirred for overnight. Water (300 mL) was added and extracted with EtOAc three times (100 mL). The crude product purified by flash chromatography to afford the desired product. MS (m/z) 236 [M+H]+.

The synthetic route of 3,5-Dichloropyrazine-2-carboxylic acid has been constantly updated, and we look forward to future research findings.

Application of 14508-49-7, A common heterocyclic compound, 14508-49-7, name is 2-Chloropyrazine, molecular formula is C4H3ClN2, 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.

20.0 g (174.6 mmol) of chloropyrazine are added dropwise to 61.7 g (1.2 mol) of hydrazine hydrate, and the mixture is stirred at 120 C. for 45 min. The mixture is then allowed to stand at 2 C. for 24 h. The solid is filtered off and washed twice with petroleum ether. The solid is initially air-dried and then dried under high vacuum. The solid is then recrystallized from toluene and again dried under high vacuum.Yield: 6.5 g (34% of theory)LC-MS (Method 1): Rt=0.41 min; MS (ESIpos): m/z=111 [M+H]+.

The synthetic route of 14508-49-7 has been constantly updated, and we look forward to future research findings.