Day: April 7, 2022

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. 20970-75-6, name is 2-Cyano-3-methylpyridine, the common compound, a new synthetic route is introduced below. Product Details of 20970-75-6

General procedure: To a 25 mL round-bottom flask equipped with magnetic stirrer were added nitrile (2 mmol), acetaldoxime (6 mmol), sodium molybdate (VI) dihydrate (0.2 mmol) and H2O (10 mL). The mixture was heated to reflux for 5-16 h. After cooling to room temperature, the solution was directly evaporated to dryness and the residue was purified by column chromatography on silica gel (ethylacetate/n-hexane) to give the corresponding amide.

The synthetic route of 20970-75-6 has been constantly updated, and we look forward to future research findings.

Reference:
Article; Ma, Xiaoyun; He, Ying; Lu, Ming; Synthetic Communications; vol. 44; 4; (2014); p. 474 – 480;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthetic Route of 62002-31-7, 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. 62002-31-7, name is 4,5,6,7-Tetrahydro-3H-imidazo[4,5-c]pyridine dihydrochloride. A new synthetic method of this compound is introduced below.

To a stirred solution of 1H,4H,5H,6H,7H-pyrazolo[4,3-c]pyridine dihydrochloride (7 g, 35.70 mmol, 1 equiv.) and 4,5-dichloro-2-(oxan-2-yl)-2,3-dihydropyridazin-3-one (10.7 g, 42.84 mmol, 1.2 equiv.) in DMA(100 mL) was added DIEA(13.8 g, 107.10 mmol, 3 equiv.) in portions at room temperature under nitrogen atmosphere. The resulting mixture was stirred for overnight at 100 degrees Celsius under nitrogen atmosphere. The reaction was monitored by LCMS. The resulting mixture was extracted with EtOAc (100 x mL). The combined organic layers were washed with brine (3×100 mL), dried over anhydrous Na2SO4. After filtration, the filtrate was concentrated under reduced pressure. This resulted in 4-chloro-2-(oxan-2-yl)-5- [1H,4H,5H,6H,7H-pyrazolo[4,3-c]pyridin-5-yl]-2,3-dihydropyridazin-3-one (8.5 g, 70.91%) as a light y

At the same time, in my other blogs, there are other synthetic methods of this type of compound,62002-31-7, 4,5,6,7-Tetrahydro-3H-imidazo[4,5-c]pyridine dihydrochloride, and friends who are interested can also refer to it.

Reference:
Patent; GOLDFINCH BIO, INC.; YU, Maolin; DANIELS, Matthew, H.; HARMANGE, Jean-christophe, P.; TIBBITTS, Thomas, T.; LEDEBOER, Mark, W.; WALSH, Liron; MUNDEL, Peter, H.; MALOJCIC, Goran; (860 pag.)WO2019/55966; (2019); A2;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 131747-53-0, Adding some certain compound to certain chemical reactions, such as: 131747-53-0, name is (6-(Trifluoromethyl)pyridin-2-yl)methanol,molecular formula is C7H6F3NO, 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 131747-53-0.

3.78 g of carbon tetrabromide and 2.78 g of triphenylphosphine were added to a solution containing 1.70 g of the (6-trifluoromethylpyridin-2-yl) methanol obtained in (4) dissolved in 30 ml of methylene chloride followed by stirring for 1 hour at room temperature. 30 ml of acetonitrile, 1.52 g of N-(t-butoxycarbonyl) hydroxylamine and 1.74 g of 1,8-diazabicyclo[5.4.0]-7-undecene (DBU) were added to this reaction solution followed by stirring for 3 hours at room temperature. Following completion of the reaction, aqueous ammonium chloride solution was added to the reaction mixture followed by extraction with ethyl acetate. The ethyl acetate layer was dried by addition of anhydrous magnesium sulfate followed by filtration and distilling off the solvent from the filtrate under reduced pressure. The resulting residue was purified by silica gel column chromatography (developing solvent; n-hexane:ethyl acetate = 3:1 (volume ratio)) to obtain 1.54 g of the target compound of t-butyl N-[(6-trifluoromethylpyridin-2-yl)methyloxy] carbamate (yield: 59%). [1H-NMR Data of t-Butyl N-[(6-trifluoromethylpyridin-2-yl)methyloxy] Carbamate 1H-NMR (CDCl3/TMS, delta ppm): 7.90(dd,1H), 7.73(d,1H), 7.62(d,1H), 7.44(bs,1H), 1.48(s,9H)

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. 131747-53-0, (6-(Trifluoromethyl)pyridin-2-yl)methanol, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; Nippon Soda Co., Ltd.; EP2218711; (2010); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthetic Route of 73406-50-5 ,Some common heterocyclic compound, 73406-50-5, molecular formula is C8H9NO3, 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.

2-(Pyrrolidin-1-yl)carbonyl-3-hydroxy pyridine 18 g (0.093 moles) of ethyl-3-hydroxypicolinate [J. Heterocyclic Chem. 23 , 665, 1986] were cooled at -5C and ml 250 of pyrrolidine were added under nitrogen atmosphere. After the addition, the solution was allowed to reach room temperature, stirred 24 h and then evaporated in vacuo to give 15 g of the title compound as a slight yellow oil which crystallized on standing.

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. 73406-50-5, Ethyl 3-hydroxypicolinate, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; Smithkline Beecham Farmaceutici S.p.A.; EP447704; (1991); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Related Products of 19842-08-1 ,Some common heterocyclic compound, 19842-08-1, molecular formula is C7H8BrN, 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.

In a 2 L round-bottomed flask was charged n-butyllithium 2.5M hexanes (99 ml, 248 mmol) in Et2O (1680 ml) to give a colorless solution. The reaction was cooled to -78 C. n-Butyllithium 2.5M hexanes (99 ml, 248 mmol) was added dropwise keeping the temperature below -70 C. The reaction was stirred for 1 hour and N,N-dimethylformamide (36.6 ml, 473 mmol) was added keeping the temperature below -70 C. The reaction was stirred for 1 hour and quenched with saturated ammonium chloride solution (2 L). The organic layer was washed with brine, dried over sodium sulfate and solvent removed under reduced pressure. The crude residue was purified by column chromatography eluting with 0-30% ethyl acetate to give 6-bromonicotinaldehyde. Yield 19.7 g, 44.8%In a 2 L round-bottomed flask was added Methyltriphenylphosphonium bromide (42.9 g, 120 mmol) in THF (600 ml) and cooled to -20 C. n-Butyllithium 2.5M hexanes (48.0 ml, 120 mmol) was added dropwise keeping the temperature below 0 C. The reaction was warmed to room temperature for 20 minutes and cooled back to 0 C. A solution of 6-bromonicotinaldehyde (18.6 g, 100 mmol) in THF (40 mL) was added. The reaction was warmed to room temperature and stirred overnight. The reaction was partitioned between water and diethyl ether (1 L) and the organic layer was dried over sodium sulfate, filtered and solvent removed at room temperature under reduced pressure. The product, 2-bromo-5-vinylpyridine, was purified by bulb to bulb distillation (600 mTorr, 80-100 C.). Yield 17.2 g, 93%2-Bromo-5-vinylpyridine (17.2 g, 40.1 mmol) was dissolved in ethanol (150 mL) and Adam’s Catalyst (PtO2, 75%, 1.4 g) was added. The mixture was hydrogenated at 3 psi of hydrogen, continually checking the progress of the reaction by LC and 1H NMR between each charge of hydrogen. After 10 psi was consumed, the data showed completion of the reaction with <5% of reduction of the bromine. The catalyst was filtered off and the solvent was removed under reduced pressure at 20 C. to give 2-bromo-5-ethylpyridine. Yield 17 g, 98%.In a 1 L round-bottomed flask was compound 6 (10 g, 53.8 mmol) and 4-methyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline (13.83 g, 59.1 mmol) in Dioxane (300 ml) followed by saturated sodium bicarbonate (150 ml). The mixture was degassed by passing a stream of nitrogen through the mixture for 20 minutes. Tetrakis(triphenylphosphine) palladium(0) (3.36 g, 2.91 mmol) was added and the mixture was heated to reflux becoming very thick then finally going to solution. The reaction was heated for 2 hours, cooled to room temperature and the solvent removed under reduced pressure. The residue was partitioned between ethyl acetate and water. The organic layer was dried over sodium sulfate and solvent removed under reduced pressure. The residue was purified by column chromatography 0-100% ethyl acetate/heptane to give 3-(5-ethylpyridin-2-yl)-4-methylaniline. Yield 8.7 g, 77%The urea was formed from 3-(5-ethylpyridin-2-yl)-4-methylaniline and 4-(2-amino-5-tert-butylthiophene-3-carbonyl)-3,3-dimethylpiperazine-2-one. These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,19842-08-1, its application will become more common. Reference:
Patent; LOCUS PHARMACEUTICALS, INC.; US2010/41642; (2010); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Related Products of 74134-42-2, 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 74134-42-2 as follows.

NBS (131 mg, 0.735 mmol) was added to a stirred solution of 2-bromo-6- (methylthio)pyridine (100 mg, 0.490 mmol), cyanamide (26.8 mg, 0.637 mmol) and potassium teit-butoxide (66.0 mg, 0.588 mmol) in methanol (3.0 mL) at RT under nitrogen. After 20 h, the reaction mixture was concentrated in vacuo, partitioned between DCM and satd. sodium thiosulfate (aq) solution, separated, extracted using DCM (x 2), dried (Phase Separator), and the solvents were removed in vacuo to give the title compound (crude, 124 mg) as a pale yellow oil that was used directly in the next step without purification.LCMS (Method A): RT = 0.65 mi mlz = 244, 246 [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,74134-42-2, its application will become more common.

Reference:
Patent; ALMAC DISCOVERY LIMITED; BURKAMP, Frank; ROUNTREE, James Samuel Shane; TREDER, Adam Piotr; (155 pag.)WO2018/11569; (2018); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

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. 65753-52-8, name is 2-Fluoro-3-(trifluoromethyl)pyridine, molecular formula is C6H3F4N, The 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. name: 2-Fluoro-3-(trifluoromethyl)pyridine

750 g of 2-fluoro-3-trifluoromethylpyridine was added to the ammoniation reactor.700g of water was added to the ammoniation reactor, and then 250g of liquid ammonia was fed to the ammoniation reactor.Raise temperature to 130C, pressure not more than 3.0MPa, react for 10 hours,Cool down to 90 C, discharge to the receiving kettle, receive cooling down to 10 C,2-Amino-3-trifluoromethylpyridine is obtained by centrifugation and drying; the yield is about 95%

With the rapid development of chemical substances, we look forward to future research findings about 65753-52-8.

Reference:
Patent; Shandong Huimeng Biological Technology Co., Ltd.; Xiao Caigen; Liu Shuwen; (6 pag.)CN108003093; (2018); A;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 36357-38-7, Adding some certain compound to certain chemical reactions, such as: 36357-38-7, name is 5-Acetyl-2-methylpyridine,molecular formula is C8H9NO, 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 36357-38-7.

Sodium borohydride (2.3 g, 0.06 mol) was added in small portions over 30 min, to a solution of compound 2a (16.4 g, 0.121 mol) in ethanol (160 mL) at 0C and the reaction mixture was stirred at same temperature. After 1 h, the reaction mixture was diluted with sodium bicarbonate solution (sat) (2×200 mL) and extracted with dichloromethane (2×500 mL). The combined organic extract was dried over anhydrous sodium sulphate and concentrated to afford a pale yellow oil, which was purified by flash column chromatography (5% methanol/dichloromethane) to afford compound 3a (17.0 g; 93% yield over 2 steps) as a pale yellow oil. ES-MS [M+l]+: 138.1. 1H NMR (400 MHz, CDC13): delta 8.35 (d, J = 2.0 Hz, 1H), 7.63 (dd, J = 8.0, 2.4 Hz, 1H), 7.12 (d, J = 8.0 Hz, 1H), 4.89 (q, J = 6.5 Hz, 1H), 3.30 (br s, 1H), 2.50 (s, 3H), 1.48 (d, J = 6.5 Hz, 3H).

According to the analysis of related databases, 36357-38-7, the application of this compound in the production field has become more and more popular.

Reference:
Patent; MINORYX THERAPEUTICS S.L.; GARCIA COLLAZO, Ana Maria; TEN HOEVE, Wolter; KOEK, Johannes Nicolaas; REWINKEL, Johannes B.M.; DE WILDE, Sander; (83 pag.)WO2018/116281; (2018); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 401892-47-5, 5-Bromo-2-chloro-4-iodopyridine, 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, 401892-47-5, blongs to pyridine-derivatives compound. name: 5-Bromo-2-chloro-4-iodopyridine

To a stirred solution of 5-bromo-2-chloro-4-iodopyridine (40 g, 126.2 mmol, 1 eq) in DMF (400 mL) was added methyl 2,2-difluoro-2-(fluorosulfonyl)acetate (32.1 mL, 252.5 mmol, 2 eq) followed by CuT (48.2 g, 252.5 mmol, 2 eq). The resulting mixture was heated at 100 C for 6 h. TLC analysis indicated formation of a non-polar spot. The reaction mixture was diluted with water (200 mL), filtered through a celite pad and washed with n-pentane (2 x 500 mL) and followed by cold water (3 x 1000 mL). Organic layers were separated, dried over Na2SO4 and concentrated under reduced pressure at 30 C resulted 5-bromo-2-chloro-4-(trifluoromethyl)pyridine (21 g, 64% yield) as a liquid compound. TLC: 5% EtOAc in pet ether; Rf: 0.7

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,401892-47-5, its application will become more common.

Reference:
Patent; PROPELLON THERAPEUTICS INC.; AL-AWAR, Rima; ISAAC, Methvin; JOSEPH, Babu; LIU, Yong; MAMAI, Ahmed; PODA, Gennady; SUBRAMANIAN, Pandiaraju; UEHLING, David; WILSON, Brian; ZEPEDA-VELAZQUEZ, Carlos Armando; (311 pag.)WO2019/46944; (2019); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

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. 99368-68-0, name is 6-Chloro-5-(trifluoromethyl)pyridin-3-amine, molecular formula is C6H4ClF3N2, The 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. Formula: C6H4ClF3N2

6. l-(5-Amino-3-trifluoromethyl-pyridin-2~yl)-ethanone Heat a mixture of 6-chloro-5-trifluoromethyl-pyridin-3-ylamine (985 mg, 5.0 mmol), palladium acetate (20 mg), DPPP (60 mg), butyl vinyl ether (1.5 g, 15 mmol) and NaHCO3 (840 mg, 10 mmol) EPO in MeOH (10 mL) at 13O0C for 18 hours. Cool, filter and wash the solid with MeOH. Add 6M hydrochloric acid (5 mL), stir for 1 hour and evaporate the volatiles. Dissolve the residue in EtOAc (50 mL) and wash with saturated NaHCO3(aq) (50 mL) and brine (50 mL). Dry the organic extract over MgSO4 and remove the solvent under reduced pressure to yield the title compound.

With the rapid development of chemical substances, we look forward to future research findings about 99368-68-0.

Reference:
Patent; NEUROGEN CORPORATION; WO2006/42289; (2006); A2;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem