Category: pyrazoles-derivatives

Electric Literature of 51516-67-7, A common heterocyclic compound, 51516-67-7, name is 5-Amino-1-(4-chlorophenyl)-1H-pyrazole-4-carbonitrile, molecular formula is C10H7ClN4, 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.

General procedure: A mixture of theintermediate compounds 2 (1 mmol) and 3 (1 mmol) in ethanol(10 mL) was stirred at reflux for 2 h. After cooling to roomtemperature, the precipitated solid was filtered, and thenrecrystallized from ethanol to give the title compounds 5a-5p.

The synthetic route of 51516-67-7 has been constantly updated, and we look forward to future research findings.

Reference:
Article; Lv, Xian-Hai; Ren, Zi-Li; Li, Dong-Dong; Ruan, Ban-Feng; Li, Qing-Shan; Chu, Ming-Jie; Ai, Cheng-Ying; Liu, Dao-Hong; Mo, Kai; Cao, Hai-Qun; Chinese Chemical Letters; vol. 28; 2; (2017); p. 377 – 382;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

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. 1280210-79-8, name is tert-Butyl 4,6-dihydropyrrolo[3,4-c]pyrazole-5(2H)-carboxylate, This compound has unique chemical properties. The synthetic route is as follows., Recommanded Product: tert-Butyl 4,6-dihydropyrrolo[3,4-c]pyrazole-5(2H)-carboxylate

INTERMEDIATE 4; Step A: fert-Butyl 2-(2-aniino-2-oxoemyl)-2,6-dihvdropvrrolof3,4-c|pyrazole-5(4H)- carboxylateA 2 L three neck flask fitted with a thermometer, a mechanical stirrer and an addition funnel was charged with a suspension of tert-butyl 2,6-dihydropyrrolo[3,4-c]pyrazole- 5(4H)-carboxylate (18.01 g, 86.5 mmol) in anhydrous acetonitrile (1.0 L). Sodium hydride (60% dispersion in oil, 4.15 g, 104 mmol) was added to the suspension in one portion under nitrogen. The reaction was stirred at room temperature for 2 h. The resulting white suspension was then cooled in an ice bath and iodoacetamide (31.95 g, 173 mmol) was added. The ice bath was then removed and the mixture was stirred 18 h at room temperature. The mixture was quenched with water (50 mL) and the solvent was removed under reduced pressure. The residue was partitioned between diluted NaCl (50 mL brine and 100 mL water) and 1.0 L EtOAc. The aqueous layer was extracted with 2 1.0L EtOAc. The organic layers were combined and dried over Na2S04 and solvent was evaporated under reduced pressure. Crude material was purified on silica gel eluting with 20-50%EtOAc/CH2Cl2 to wash out excess iodoacetamide, and then with 2- 10%MeOH CH2Cl2 to afford a mixture of the two products which were separated on a chiral AD column by eluting with 30% MeOH/C02 to afford the title compound (less mobile fraction). LC- MS – 267.32 [M+l].

According to the analysis of related databases, 1280210-79-8, the application of this compound in the production field has become more and more popular.

Reference:
Patent; MERCK SHARP & DOHME CORP.; WILKENING, Robert, R.; APGAR, James, M.; BIFTU, Tesfaye; FENG, Danqing; QIAN, Xiaoxia; WEI, Lan; WO2011/103256; (2011); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

118430-74-3, name is 3-Cyclopropyl-1-methyl-1H-pyrazol-5-amine, belongs to pyrazoles-derivatives compound, is considered to be a conventional heterocyclic compound, which is widely used in drug synthesis. The chemical synthesis route is as follows. Quality Control of 3-Cyclopropyl-1-methyl-1H-pyrazol-5-amine

N-(4-chloro-6-methoxy-2-methyl-9H-pyrimido [4,5-bj indol-7-yl)acetamide (384 mg, 1.26 mmol), 3 -cyclopropyl- 1-methyl-i H-pyrazol-5-amine (520 mg, 3.79 mmol), and potassium tert-butoxide (709 mg, 6.32 mmol) were dissolved in DMSO (18 mL) and the reaction was heated to 140C. After overnight the reaction was cooled to room temperature, quenched with saturated ammonium chloride, and extracted with ethyl acetate. The ethyl acetate layers was washed with brine, dried over sodium sulfate, concentrated under reduce pressure and purified by reverse phase preparative HPLC to give the product (58 mg).

The synthetic route of 118430-74-3 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; THE REGENTS OF THE UNIVERSITY OF MICHIGAN; WANG, Shaomeng; ZHAO, Yujun; ZHOU, Bing; AGUILAR, Angelo; (114 pag.)WO2016/138332; (2016); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

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. 105434-90-0, name is Ethyl 5-amino-1H-pyrazole-3-carboxylate belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below. Quality Control of Ethyl 5-amino-1H-pyrazole-3-carboxylate

Subsequently, to a solution of ethyl 5-amino-3-pyrazolecarboxylate (1.337 g) in tetrahydrofuran (15 mL) was added pyridine (1.385 mL), and then a solution of 4,5-difluoro-2-methyl-benzoyl chloride in tetrahydrofuran (2 mL) was added dropwise with ice cooling. After stirring overnight at room temperature, ethanol (5 mL) and water (45 mL) were added to the reaction mixture, and the precipitated solid was collected by filtration to obtain the title compound (2.271 g) as a white solid.

The synthetic route of 105434-90-0 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; JAPAN TOBACCO, INC.; US2009/36450; (2009); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Some common heterocyclic compound, 2075-45-8, name is 4-Bromo-1H-pyrazole, molecular formula is C3H3BrN2, 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. HPLC of Formula: C3H3BrN2

A 500 mL Schlenk flask backfilled with N2was added 4-bromo-1H-pyrazole (10.0g, 68.0 mmol) and dry THF (250 mL). The resulting solution was cooled to 0 C understirring before 60% NaH dispersion (3.3 g, 81.6 mmol) was added slowly. Once H2evolution had ceased, trityl chloride (20.9 g, 74.8 mmol) was added slowly, andthe resulting mixture was stirred overnight at RT before quenching with H2O(5 mL) and drying in vacuo.Theresulting residue was triturated in dichloromethane (5 mL) and methanol (200mL) for 2 hours.The resulting suspension wasfiltered and dried overnight at 50C to give4-bromo-1-trityl-1H-pyrazole(26.0g, 66.8 mmol, 98.2%) as a white solid.1HNMR (300 MHz, DMSO-d6)delta = 7.03 – 7.06 (m, 6 H), 7.34 – 7.40 (m, 9 H), 7.51 (s, 1 H), delta 7.76 (s, 1H).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 2075-45-8, its application will become more common.

Reference:
Article; Kershaw Cook, Laurence J.; Kearsey, Rachel; Lamb, Jessica V.; Pace, Edward J.; Gould, Jamie A.; Tetrahedron Letters; vol. 57; 8; (2016); p. 895 – 898;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Synthetic Route of 25016-09-5, 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. 25016-09-5 name is 1,3-Dimethyl-1H-pyrazole-5-carbaldehyde, This 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.

1 Preparation of 2-pyridyl-(1,3-dimethyl-5-pyrazolyl)methanol: 300 ml of dry tetrahydrofuran solution containing 5.5 g of 2-bromopyridine was cooled to -78C, and 5.45 g of n-butyl lithium hexane solution (15 w/w %) was dropwise added thereto and stirred for 30 minutes. Then, 4.2 g of 1,3-dimethyl-5-formylpyrazole was dropwise added thereto. Afterwards, this was gradually heated up to room temperature and stirred for 15 hours. The solution was neutralized by adding 2 N hydrochloric acid thereto, and then extracted three times each with 150 ml of ethyl acetate. The organic layer was dried with anhydrous sodium sulfate, the solvent was removed by distillation under reduced pressure, and the residue was purified by silica gel column chromatography (developing solution; chloroform) to give 5.2 g of 2-pyridyl-(1,3-dimethyl-5-pyrazolyl)methanol as a brown oily product.

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 1,3-Dimethyl-1H-pyrazole-5-carbaldehyde, and friends who are interested can also refer to it.

Reference:
Patent; NISSAN CHEMICAL INDUSTRIES, LIMITED; EP556396; (1993); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

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. 35344-95-7, name is 1H-Pyrazole-4-carbaldehyde, This compound has unique chemical properties. The synthetic route is as follows., Formula: C4H4N2O

To a stirred solution of (l-phenylazetidin-3-yl) methanesuifonate (500 mg, 2.20 mmol) and lH-pyrazole-4- carbaidehyde (317 08 mg, 3.30 mmol) in DMF (10 mL) was added cesium carbonate (1.43 g, 4.40 mmol) anf the reaction mixture was heated to 80 C for 16 hours. After consumption of starting material, the reaction mass was diluted with water, extracted with ethyl acetate, washed with brine, dried over anhydrous sodium sulphate and evaporated under reduced pressure. The crude was purified by combi-flash column chromatography (using 30% ethyl acetate in n-hexane) to afford l-(l-phenyl-azetidin-3-yl)-lH-pyrazole-4-carbaldehyde (300 mg, 1.23 mmol, 55 80% yield, 93% purity, 000) as light yellow solid. LCMS (ES+) = 227 8 | M I f )

Chemical properties determine the actual use. Each compound has specific chemical properties and uses. We look forward to more synthetic routes in the future to expand reaction routes of 35344-95-7.

Reference:
Patent; C4 THERAPEUTICS, INC.; VEITS, Gesine, Kerstin; HE, Minsheng; HENDERSON, James, A.; NASVESCHUK, Christopher, G.; PHILLIPS, Andrew, J.; GOOD, Andrew, Charles; (471 pag.)WO2019/191112; (2019); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Some common heterocyclic compound, 31230-17-8, name is 5-Methyl-1H-pyrazol-3-amine, molecular formula is C4H7N3, 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: 31230-17-8

1.1 -Diniethylethyl 3-amino-5-methyl- lH-pyrazole- 1 -carboxylate; 5-Methyl-lH-pyrazol-3-amine (800 mg, 8.25 mmol) was dissolved in DMF (10 mL) at 0 0C and treated with sodium hydride (336 mg, 8.25 mmol) followed by stirring for a further 30 minutes. Warmed di-tert-butyl dicarbonate (1.80 g, 8.25 mmol) was then slowly added via syringe over 5 min and the reaction was allowed to warm to RT and stirred for a further 1 hour. The reaction was taken up in saturated aqueous sodium hydrogencarbonate (50 mL) and ethyl acetate (100 mL). The organic layer was separated then dried (MgSO4), filtered and evaporated. Purification by column chromatography,eluting with 50-100percent ethyl acetate in isohexane, afforded the title compound as a colourless oil (380 mg). 1R NMR delta (CDCl3): 1.62 (s, 9Eta), 2.43 (s, 3H), 3.87 (s, 2H), 5.60 (s, IH)

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 31230-17-8, its application will become more common.

Reference:
Patent; ASTRAZENECA AB; ASTRAZENECA UK LIMITED; WO2007/17649; (2007); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Electric Literature of 143426-52-2, The chemical industry reduces the impact on the environment during synthesis 143426-52-2, name is 1-(4-(Chloromethyl)phenyl)-1H-pyrazole, I believe this compound will play a more active role in future production and life.

3 mmol of the compound IIIe was dissolved in 25 mL of DMSO, followed by the addition of 8 mmol of sodium carbonate. To the solution was added thereto at room temperature, the solution was heated to 85 C for 20 hours.The reaction was quenched, the reaction was poured intoa beakercontaining 100 mL of water, extracted several times with ethyl acetate, dried over anhydrous sodium sulfate, and the mother liquor was evaporated to dryness under reduced pressure. The resulting residue was purified bycolumn chromatography to give the title compound Ie

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, 1-(4-(Chloromethyl)phenyl)-1H-pyrazole, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; Nantong University; Dai Hong; Shi Yujun; Yao Wei; Song Chan; Qian Hongwei; Wang Xianglong; Zhang Zhou; Han Xudong; (16 pag.)CN106946782; (2017); A;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Reference of 14531-55-6,Some common heterocyclic compound, 14531-55-6, name is 3,5-Dimethyl-4-nitro-1H-pyrazole, molecular formula is C5H7N3O2, 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.

To a solution of 3 5-dimethyl-4-nitropyrazole (Fluorochem, Derbyshire, UK1 989 mg, 7 01 mmol) in DMF (40 ml) was added in two portions 55% NaH in oil (420 mg, 9 63 mmol) The reaction mixture was stirred for 30 mm at rt then 2-bromoethyl methyl ether (Aldrich, Buchs, Switzerland, 1 17 g, 8 42 mmol) was added and the reaction mixture stirred for 2 h at rt The reaction mixture was quenched wtth water and extracted with EtOAc The organic layer was washed with water (2x) and brine (2x), d?ed over Na2SO4, filtered and evaporated The crude product was purified by Prep HPLC (H2O (0 1% TFA)/CH3CN 95 5 to 50 50 ?verse phase silica gel) The fractions containing product were collected together, basified with NaHCO3 and concentrated before being extracted with EtOAc (3x) The combined organic layers were washed with brine, dried over Na2SO4, filtered and evaporated to give the title compound as a white solid (HPLC tR 2 57 mm (Method A), M+H = 200 MS-ES).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 3,5-Dimethyl-4-nitro-1H-pyrazole, its application will become more common.

Reference:
Patent; NOVARTIS AG; FURET, Pascal; KALTHOFF, Frank Stephan; MAH, Robert; RAGOT, Christian; STAUFFER, Frederic; WO2010/139731; (2010); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics