Pyridine-derivatives

Related Products of 58596-88-6 ,Some common heterocyclic compound, 58596-88-6, molecular formula is C6H4Cl2N2O2, 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.

(2e) 6-Chloro-5-methyl-3-nitro-2-pyridinamine [Formula 22]; A mixture of 2,6-dichloro-3-methyl-5- nitropyridine (10.41 g, 50.3 mmol), 28% aqueous ammonia solution (17 ml, 0.25 mol), potassium carbonate (10.4 g, 75.5 mmol) and t-butanol (167 ml) was stirred overnight at 60C under nitrogen atmosphere. After stirring at room temperature for 3 hours, a precipitate was filtered and then washed three times with water, thereby yielding the title compound (4.25 g, 22.7 mmol, 45%) as a yellow solid. ¹H NMR(400MHz, QMSO-D6) No. ppm; 2.23,(3H, s), 8.04(2H, br s), 8.39(1H, s).

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. 58596-88-6, 2,6-Dichloro-3-methyl-5-nitropyridine, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; EISAI CO., LTD.; WO2005/103049; (2005); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The major producers of chemicals have been the Europe, Japan and China. Due to the growing call for a cleaner, greener environment, people will have to find innovative ways to maintain their relevance. Here is a compound 58483-95-7, name is 5-Amino-2-chloropyridine-4-carboxylic acid. This compound has unique chemical properties. The synthetic route is as follows. category: pyridine-derivatives

General procedure: A mixture of compound 5-amino-2-chloropyridine-4-carboxylic acid(1000 g, 5.8 mol) was dissolved in 5000 mlEthylene glycol monomethyl ether, AddedFormamidine hydrochloride(1867 g, 23.2 mol), sodium acetate (2360 g, 17.4 mol). The reaction was heated to 120 ° C for 6 hours. After the reaction was complete, the reaction was cooled to room temperature, poured into 4000 ml of water and extracted twice with ethyl acetate. The organic phase was combined, dried and concentrated to afford the crude product which was filtered to give 6-chloropyridine And [3,4-d] pyrimidin-4 (3H) ketone (924 g, 5-1 mol)

With the rapid development of chemical substances, we look forward to future research findings about 58483-95-7.

Reference:
Patent; Bide Pharmatech Ltd.; Li, Jinfei; Li, Xinling; Huang, Liangfu; Ou, Yanghao; (7 pag.)CN104130256; (2016); B;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adding a certain compound to certain chemical reactions, such as: 97483-77-7, 5-Bromopicolinonitrile, 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, Application In Synthesis of 5-Bromopicolinonitrile, blongs to pyridine-derivatives compound. Application In Synthesis of 5-Bromopicolinonitrile

Part A: Compound 414 (1.0 g, 5.46 mmol) was suspended in diethylether (30 mL) and cooled to -78 0C. Titanium (IV) isopropoxide (1.7 mL, 6.01 mmol) was added dropwise and stirred for 5 minutes. Ethyl magnesium bromide (3M in diethylether, 4.0 mL) was added dropwise and stirred for 30 minutes at the same temperature and 1 hour at room temperature. Boron trifluoride dietherate (1.55 g, 10.92 mmol) was added dropwise and the reaction was stirred for 2 hours. The reaction was quenched with 1 M hydrochloric acid and the aqueous layer was washed with diethyl ether. The aqueous layer was made basic (pH = 10) and extracted with ethyl acetate. The organic layer was dried over sodium sulfate and concentrated. Column chromatography (1 :1 hexanes/ethyl acetate) provided the desired product (350 mg, 30%). 1H NMR (400 MHz, CDCI3) delta 8.5 (d, 1 H), 7.7 (m, 1H)1 7.3 (d, 1 H), 1.25 (m, 2H), 1.15 (m, 2H).

At the same time, in my other blogs, there are other synthetic methods of this type of compound,97483-77-7, 5-Bromopicolinonitrile, and friends who are interested can also refer to it.

Reference:
Patent; SCHERING CORPORATION; WO2007/84451; (2007); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthetic Route of 99163-12-9, 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. 99163-12-9, name is 4-Pyridin-4-yl-benzaldehyde. A new synthetic method of this compound is introduced below.

Having established an access to both hexT-pyrazolines, and hexT- pyrazoles by selection of reaction conditions, next libraries of both heterocycles from aldehydes, a hydrazide, and hexT-4 were synthesized (Figure 28). While aldehydes are abundantly available to introduce diversity in the heterocycle, the hydrazide had to be synthesized de novo, and therefore lent itself to functionalization with an acylatable primary amine 11 for combinatorial library synthesis. In the course of the library synthesis it was found that aliphatic aldehydes related to isobutyric aldehyde AJ, i.e. branched in a-position, neatly yielded the pyrazoline conjugates hexT-12 in MeCN at 50C (condition A, Table 27) whereas linear aliphatic and benzaldehydes were not reactive (Figure 29). Only a small number of benzaldehydes furnished the pyrazolines hexT- 12 in glacial acetic acid at 50C (Figure 25). However, both branched aliphatic aldehydes, and benzaldehydes yielded pyrazoles hexT-13 (Figure 30) in glacial acetic acid at 60C (condition C, Figure 27). Notably, isatin L gave rise to the spirooxindole hexT-13L under these conditions. Linear aliphatic aldehydes were again not reactive, also pyridine carboxaldehydes and related structures did not yield the corresponding hexT-13 conjugates, likely due to poisoning of the catalyst. In total 23 pyrazolines hexT-12 and 41 pyrazoles hexT-13 were obtained with yields between 0.5 and 3 nmol after purification by HPLC. Usually, branched aliphatic aldehydes gave higher yields than aromatic aldehydes. The pyrazolines hexT-12 and pyrazoles hexT-13 were ligated with each a duplex DNA encoding the heterocycles, and dsDNA sequences encoding the aldehyde building blocks.

At the same time, in my other blogs, there are other synthetic methods of this type of compound,99163-12-9, 4-Pyridin-4-yl-benzaldehyde, and friends who are interested can also refer to it.

Reference:
Patent; TECHNISCHE UNIVERSITAeT DORTMUND; BRUNSCHWEIGER, Andreas; KRAUSE, Norbert; ANTONCHICK, Andrey; KLIKA SKOPIC, Mateja; SALAMON, Hazem; BUGAIN, Olivia; JUNG, Kathrin; WAGNER, Bernd; (72 pag.)WO2017/108741; (2017); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Related Products of 89809-64-3, 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. 89809-64-3, name is 5-Chloropicolinonitrile, molecular formula is C6H3ClN2, 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.

A. Preparation of methyl 5-chloropicolinate A mixture of 5-chloropicolinonitrile (4 g, 28.87 mmol), concentrated aq. HCl (10 mL) and concentrated H2SO4 (5 mL) in methanol (30 mL) was stirred at reflux for 35 h under argon. The reaction mixture was concentrated and then carefully diluted with water (50 mL). The pH was adjusted to 6-7 with 20% aqueous NaOH solution. The product was extracted with EtOAc (3*20 mL). The combined organic phase was washed with brine, dried (MgSO4), filtered and concentrated under vacuum to obtain 4.9 g of the title compound as a white solid. HPLC/MS: retention time=1.977 min, [M+H]+=172.

According to the analysis of related databases, 89809-64-3, the application of this compound in the production field has become more and more popular.

Reference:
Patent; Sun, Chongqing; Sher, Philip M.; Wu, Gang; Ewing, William R.; Huang, Yanting; Lee, Taekyu; Murugesan, Natesan; Sulsky, Richard B.; US2007/4772; (2007); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Related Products of 626-64-2 , The common heterocyclic compound, 626-64-2, name is Pyridin-4-ol, molecular formula is C5H5NO, 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.

4-Hydroxy pyridine (0.68g, 7.20mmol), 3,5-difluorobenzonitrile (0.5g, 3.60mmol), K2CO3 (1.73g, 12.6mmol) and DMF (15ml) were taken in a 50ml round bottom flask. The mixture was stirred constantly at 80C (Scheme 1). After 48h, heating was stopped and the reaction mixture was allowed to cool down at room temperature. After that, the mixture was poured into ice-cold water to obtain a white solid precipitate. It was filtered and air dried. Yield: 0.96g, (92%). SI-MS: [M+H], m/z: 290.0934 (100%) (calcd for C17H11N3O2, 289.0851) (Fig. S1). Anal. calcd. for C17H11N3O2: C, 70.59; H, 3.80; N, 14.53%. Found: C, 70.61; H, 3.82; N, 14.6% IR (cm-1, KBr pellet): 3426 (m), 3044 (m), 2943 (m) 2245 (m), 1651 (s), 1599 (s), 1443 (s), 1349 (s), 1248 (s), 1199 (s), 1090 (m), 892 (m), 843 (s), 690 (m), 557(m), 496 (m) (Fig. S2).

The synthetic route of 626-64-2 has been constantly updated, and we look forward to future research findings.

Reference:
Article; Agarwal, Rashmi A.; De, Dinesh; Polyhedron; vol. 185; (2020);,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 72990-37-5 ,Some common heterocyclic compound, 72990-37-5, molecular formula is C6H4ClNO, 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.

Reference Production Example 4 To a mixture of 1.53 g of 3-chloroisonicotinaldehyde and 5 ml of ethanol was gradually added 0.40 g of sodium borohydride under ice-cooling, and the mixture was stirred under ice-cooling for 1 hour, and subsequently at room temperature for 1 hour. Saturated brine was added to the reaction mixture, and the mixture was extracted twice with ethyl acetate. The organic layers were combined and dried over magnesium sulfate. The resulting mixture was concentrated under reduced pressure to obtain 1.40 g of (3-chloropyridin-4-yl)methanol. 1H-NMR (CDCl3) delta: 8.54-8.49 (m, 2H), 7.55-7.51 (m, 1H), 4.83 (d, J=4.4 Hz, 2H), 2.34-2.29 (br m, 1H)

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,72990-37-5, its application will become more common.

Reference:
Patent; SUMITOMO CHEMICAL COMPANY, LIMITED; Iwakoshi, Mitsuhiko; Takyo, Hayato; US2013/90353; (2013); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The major producers of chemicals have been the Europe, Japan and China. Due to the growing call for a cleaner, greener environment, people will have to find innovative ways to maintain their relevance. Here is a compound 1211540-79-2, name is 2,3-Dihydro-1H-pyrrolo[3,2-b]pyridine. This compound has unique chemical properties. The synthetic route is as follows. COA of Formula: C7H8N2

To a solution of 2,3-dihydro-1 H-pyrrolo[3,2-b]pyridine (9.05 g, 75.3 mmol) and dichloropyrimidine (12.3 g, 75.3 mmol) in te/t-butanol (90 mL) and toluene (90 mL) was added cesium carbonate (37.6g). The mixture was degassed with a stream of nitrogen gas. Bis(triphenylphosphine)palladium(ll) dichloride (1.59 g) was added and the mixture was again degassed with nitrogen for several minutes. The resulting mixture was heated at reflux (115 degrees Celsius) for 18 hours. The mixture was cooled to room temperature, diluted with ethyl acetate and the mixture was filtered through diatomaceous earth. The filtrate was concentrated in vacuo to an oil. This oil was dissolved in 2-methyl tetrahydrofuran (400 mL) and 300 mL of 1 N aqueous hydrochloric acid was added. The aqueous layer was separated and extracted twice with 2-methyl tetrahydrofuran. The combined organic extracts were washed with water. The combined aqueous layers were cooled in an ice bath and triethylamine was added slowly until the pH was adjusted to 8 to 9. A precipitate formed and these solids were collected by filtration. The aqueous filtrate was extracted twice with 2-methyl tetrahydrofuran. These combined organic extracts were washed with brine, dried over sodium sulfate, filtered and the filtrate was concentrated in vacuo. The residue was combined with the previously collected solids, dissolved in 2-methyl tetrahydrofuran and concentrated in vacuo. The reside was purified by flash chromatography using 330 g of silica gel, eluting with a gradient mixture of heptane and ethyl acetate (50 to 100% over 30 min and then 100% ethyl acetate for 30 min) to give 1-(6-chloro-5-methylpyrimidin-4-yl)-2,3- dihydro-1 H-pyrrolo[3,2-b]pyridine as an off-white solid (25.5 g). 1H NMR (400 MHz, deuterochloroform) delta 2.27 (s, 3 H) 3.29 (t, J=8.39 Hz, 2 H) 4.18 (t, J=8.39 Hz, 2 H) 7.03 (dd, J=8.10, 4.98 Hz, 1 H) 7.20 (dd, J=8.10, 1.27 Hz, 1 H) 8.07 (dd, J=5.08, 1.37 Hz, 1 H) 8.47 (s, 1 H)

With the rapid development of chemical substances, we look forward to future research findings about 1211540-79-2.

Reference:
Patent; PFIZER INC.; DAROUT, Etzer; DENINNO, Michael, Paul; FUTATSUGI, Kentaro; GUIMARAES, Cristiano, Ruch, Werneck; LEFKER, Bruce, Allen; MASCITTI, Vincent; MCCLURE, Kim, Francis; MUNCHHOF, Michael, John; ROBINSON, Ralph, Pelton, Jr.; WO2010/128414; (2010); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reference of 1659-31-0, 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. 1659-31-0, name is Dipyridin-2-yl carbonate. A new synthetic method of this compound is introduced below.

Under nitrogen atmosphere, to a stirred mixture of (4-cyclohexylphenyl)-methanol (0.3 g, 1.58 mmol) in dry CH2C12 (2 mL), DMAP (0.019 g, 0.16 mmol) and di-2-pyridyl- carbonate (0.41 1 g, 1.90 mmol) were added. The reaction mixture was left to react at rt for 15 h, then diluted with CH2C12 and washed first with a saturated NH4C1 solution (3.0 mL) and subsequently with a saturated NaHC03 solution (3X3 mL). The organic fraction was dried over Na2S04, filtered and concentrated to dryness to afford a colorless oil (0.464 g, 95%), as a mixture (ratio 1.8: 1) of (4-cyclohexylphenyl)-methyl-2-pyridyl carbonate and (4- cyclohexylphenyl)-methy 1-2 -oxopyridine-1 -carboxylate. The mixture of isomers was not separated and used in the next step without any further purification. MS (ESI) m/z 350 [M- K]+.

At the same time, in my other blogs, there are other synthetic methods of this type of compound,1659-31-0, Dipyridin-2-yl carbonate, and friends who are interested can also refer to it.

Reference:
Patent; THE REGENTS OF THE UNIVERSITY OF CALIFORNIA; IIT – ISTITUTO ITALIANO DI TECNOLOGIA; UNIVERSITY DEGLI STUDI DI URBINO; UNIVERSITA DEGLI STUDI DI PARMA; PIOMELLI, Daniele; BANDIERA, Tiziano; MOR, Marco; TARZIA, Giorgio; BERTOZZI, Fabio; PONZANO, Stefano; WO2013/78430; (2013); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthetic Route of 70201-42-2, With the rapid development and complex challenges of chemical substances, the synthesis of new drugs is usually one of the most effective ways to increase yield.70201-42-2, name is 3,5-Dibromoisonicotinaldehyde, molecular formula is C6H3Br2NO, molecular weight is 264.9, as common compound, the synthetic route is as follows.

To a solution of cesium carbonate (9.20 g, 28.2 mmol) and 4-phenylphenol (2.40 g, 14.1 mmol) in anhydrous THF (100 mL) under an inert atmosphere was added a solution of 3,5-dibromopyridine-4-carboxaldehyde (7.48 g, 28.2 mmol) in THF (25 mL). The reaction mixture was heated at reflux for 4 hours then was allowed to cool to room temperature. The reaction mixture was filtered and the solvent was removed in vacuo. The residue was diluted with EtOAc, washed with aqueous sodium bicarbonate, washed with brine, and dried over sodium sulfate then filtered and the solvent removed in vacuo. Purification by silica gel (eluting with 20% EtOAc: heptane) followed by recrystallization from heptane afforded 3- (bipfienyl-4-yloxy )-5-bronio-pyridine-4-carbaldehyde (4.39 g, 12.4 mmol, 87%); (at)H-NMR (DMSO-d6, 400 MHz) : 8 7.23 (m, 2H), 7.38 (m, 1H), 7.47 (m, 2H), 7.66 (m, 2H), 7.73 (m, 2H), 8.43 (s, 1H). RP-HPLC (Table 1, Method i) R(at) = 3.72 min.

Statistics shows that 70201-42-2 is playing an increasingly important role. we look forward to future research findings about 3,5-Dibromoisonicotinaldehyde.

Reference:
Patent; ABBOTT LABORATORIES; WO2005/110410; (2005); A2;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem