Category: pyrazoles-derivatives

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. 75092-30-7, name is 4-Iodo-1-methyl-1H-pyrazole-5-carboxylic acid, This compound has unique chemical properties. The synthetic route is as follows., SDS of cas: 75092-30-7

Step 1. 4-[(4-Fluorophenyl)amino]-1-methyl-1H-pyrazole-5-carboxylic acid A mixture of 4-iodo-1-methyl-1H-pyrazole-5-carboxylic acid ((Manaev, Yu. A. et al., J. Gen. Chem. USSR (Engl. Transl.), 1982, 52 (11), 2291), 500 mg, 1.98 mmol), 4-fluoroaniline (0.94 ml, 9.90 mmol), copper powder (200 mg) and 5% aqueous sodium carbonate (10 ml) was stirred for 16 h at 100 C. After cooling to room temperature, 2N aqueous sodium hydroxide (100 ml) and diethyl ether (50 ml) were added to the mixture. The mixture was filtered through a pad of Celite. The water layer was separated, washed with diethyl ether (50 ml) and acidified with concentrated hydrochloric acid. The formed precipitate was collected by filtration and dried to give 282 mg (61%) of the title compound as a white solid. Rf value: 0.50 (methanol/dichloromethane/acetic acid=1/10/2 drops). 1H-NMR (DMSO-d6) delta: 7.60 (1 H, s), 7.09-7.05 (4 H, m), 4.01 (3 H, s). Two signals due to NH and CO2H were not observed.

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 75092-30-7.

Reference:
Patent; Kawamura, Kiyoshi; Mihara, Sachiko; Nukui, Seiji; Uchida, Chikara; US2003/130277; (2003); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Application of 657428-42-7, 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. 657428-42-7 name is tert-Butyl 4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)-carboxylate, 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.

Step D: tert-Butyl 2-(methylsulfonyl)-2,6-dihydropyrrolo[3,4-c]pyrazole-5(4H)-carboxylate A solution of tert-butyl 4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)-carboxylate (30.0 kg, 143 mol) in 2-methyltetrahydrofuran (384 mg) was vacuum purged with nitrogen back-fill three times. The, triethylamine (25.0 kg, 247 mol) was added and the batch cooled to -10-5 C. Then, methanesulfonyl chloride (21.4 kg, 187 mol) was slowly added over 2 h. After stirring for 1 h at room temperature, water (150 kg) was added drop-wise at 5-15 C. This was followed by addition of 1N HCl solution until the pH was 7. The resulting layers were separated and the aqueous extracted with 2-methyltetrahydrofuran (106 kg). The combined organics were washed with saturated brine (2*150 kg), dried with Na2SO4, filtered, and concentrated to 60-90 L. The resulting crude was dissolved in 2-methyltetrahydrofuran (381 kg) and charged with a solution of potassium tert-butoxide in THF (805 g in 6.6 kg THF). After stirring 1 h at room temperature under nitrogen, more potassium tert-butoxide in THF (329 g in 3.0 kg THF) was added and stirred for 1 h. Analytical analysis indicates that tert-butyl 2-(methylsulfonyl)-2,6-dihydropyrrolo[3,4-c]pyrazole-5(4H)-carboxylate is the major regioisomer, so saturated brine (154 kg) was then added. After brief agitation, the layers are separated and the oragnics are washed with saturated brine (2*155 kg). The combined aqueous waste layers were then extracted with 2-methyltetrahydrofuran (103 kg). The combined organics were treated with activated carbon (8.75 kg), filtered, and dried with Na2SO4. This was then filtered and concentrated to 60-90 L. This slurry was then heated to dissolve solids at 40-50 C. and n-heptane was added (34 kg). After cooling to room temperature for 2-4 h, n-heptane (156 kg) was added and the slurry was then aged for 2-4 h at 0-5 C. The slurry was filtered and the cake washed with n-heptane. The solids were dried under vacuum at 45-55 C. to give tert-butyl 2-(methylsulfonyl)-2,6-dihydropyrrolo[3,4-c]pyrazole-5(4H)-carboxylate.

At the same time, in my other blogs, there are other synthetic methods of this type of compound, tert-Butyl 4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)-carboxylate, and friends who are interested can also refer to it.

Reference:
Patent; Merck Sharp & Dohme Corp; Merck Sharp & Dohme Ltd.; Arroyo, Itzia Z.; Krueger, Davida; Chen, Ping; Moment, Aaron J.; Biftu, Tesfaye; Sheen, Faye; Zhang, Yanfeng; US9181262; (2015); B2;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Reference of 113808-86-9, 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. 113808-86-9, name is 3,5-Dimethylpyrazole-4-carboxylic Acid belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below.

A mixture of 3,5-dimethyl-1H-pyrazole-4-carboxylic acid (9.6 mg, 0.069 mmol, Maybridge), piperidin-4-yl-benzothiazole (15 mg, 0.069 mmol, Compound 2h, Step 2), Hunig?s base (24 tL, 0.137 mmol) and HATU (39 mg, 0.103 mmol) was stirred overnight at room temperature in DMF (343 .iL). The reaction was purified directly by prep HPLC to give a pale yellow solid after freeze drying from dioxane (11.5 mg, 50 % yield). LCMS (ESI) m/z 341.4 (M+1) retention time 3.8 mm. ?HNMR (300MHz, CD3OD) oe = 7.95 (m, 2H), 7.50 (m, 1H), 7.44-7.38 (m, 1H), 3.55-3.41 (m, 1H), 3.3 1-3.01 (m, 2H), 2.50 (m, 2H),2.30 (s, 6H), 2.26-2. 12 (m, 2H), 1.95-1.78 (m, 2H).

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, 3,5-Dimethylpyrazole-4-carboxylic Acid, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; THE TRUSTEES OF THE UNIVERSITY OF PENNSYLVANIA; HARTY, Ronald, N.; FREEDMAN, Bruce, D.; WROBEL, Jay, E.; REITZ, Allen, B.; LOUGHRAN, H., Marie; WO2015/153554; (2015); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

10250-59-6, name is Methyl 1,3-dimethyl-1H-pyrazole-5-carboxylate, 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. Application In Synthesis of Methyl 1,3-dimethyl-1H-pyrazole-5-carboxylate

c. Synthesis of 1 ,3-dimethyl-pyrazole-5-carboxylic acid; 3,delta-dimethyl-pyrazole-delta-carboxylic acid methylester (5.14 Kg) is added to an aqueous solution of 20% sodium hydroxide (10 L) at O0C. The reaction mixture is stirred at room temperature for 18 hours and cooled to O0C. Concentrated hydrochloric acid (4.2 L) is then added to the reaction mixture in over 7 hours. The resulting thick slurry is stirred at room temperature for 18 hours. The mixture is filtered, and the solids are washed with water (500 mL), and dried in a vacuum oven for 18 hours (700C and 26 mm Hg) to provide 3.8 Kg of 1 ,3- dimethyl-pyrazole-delta-carboxylic acid (81 % yield with a purity of >97 % by HPLC).

The synthetic route of 10250-59-6 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; PFIZER INC.; WO2006/48761; (2006); A2;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Application of 916766-83-1, 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. 916766-83-1, name is 3-(4-(Chloromethyl)phenyl)-1-methyl-1H-pyrazole belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below.

To a vial containing pinacol ester (200 mg, 0.645 mmol, 1 eq), 3-[4- (chloromethyl)phenyl]-l-methyl-pyrazole (200 mg, 0.97 mmol, 1.5 eq), cesium carbonate (315 mg, 0.97 mmol, 1.5 eq) and Pd(dppf)Cl2 DCM (71 mg, 0.097 mmol, 0.15 eq) were added. The vial was sealed and evacuated under vacuum and purged with N2. THF/H2O solution (5: 1, 5.2 mL total, degassed) was then added via syringe and the resulting solution was stirred at 90 C for 16 h, after which time the reaction mixture was cooled to r.t. and filtered through a plug of Celite with EtOAc and DCM. Solvents were concentrated under reduced pressure, and crude residue was purified by reverse phase HPLC then by normal phase column chromatography (0-70% EtOAc in hexanes to 70-80% EtOAc/DCM) to give the title compound as an off white powder (72 mg, 32%). NMR (400 MHz, CDCI3) d 8.18 (d, J= 2.5 Hz, 1H), 7.78 (d, J= 8.2 Hz, 2H), 7.76 (d, j= 1.3 Hz, 1H), 7.39 (d, j= 2.2 Hz, 1H), 7.36 (s, 1H), 7.15 (d, j= 8.2 Hz, 2H), 6.53 (d, J = 2.3 Hz, 1H), 6.47 (dd, 7= 2.4, 1.9 Hz, 1H), 4.11 (s, 2H), 3.96 (s, 3H), 2.54 (s, 3H). ES-MS [M+H]+ = 355.4

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, 3-(4-(Chloromethyl)phenyl)-1-methyl-1H-pyrazole, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; VANDERBILT UNIVERSITY; LINDSLEY, Craig W.; CONN, P. Jeffrey; ENGERS, Darren W.; ENGERS, Julie L.; BENDER, Aaron M.; LONG, Madeline; (120 pag.)WO2019/241467; (2019); 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. 149978-43-8, name is 2-Methyl-5-trifluoromethyl-2H-pyrazol-3-ylamine, This compound has unique chemical properties. The synthetic route is as follows., Recommanded Product: 149978-43-8

Hydrochloric acid in 1,4-dioxane (10.5 mL, 42.0 mmol, 4 mol/L) followed by 1,1′- thiocarbonyldiimidazole (4.38 g, 23.3 mmol) were added to a stirred solution of l-methyl-3- (trifluoromethyl)-lH-pyrazol-5-amine [149978-43-8] (3.49 g, 21.1 mmol) in DCM (63 mL) under nitrogen. The reaction mixture was stirred at rt for 4.5 h before being left without stirring for a further 15.5 h. The reaction mixture was filtered and the pale yellow solid was washed with DCM (2 x 40 mL). The filtrate and washings were concentrated in vacuo to give an orange liquid which was purified by flash column chromatography on silica (gradient elution with 0% to 15% EtOAc in isohexane) to afford the title compound (3.0430 g, 14.688 mmol, 70%) as a colourless liquid. To confirm the presence of the title compound, a few drops of isobutylamine were added to the LCMS sample of the product before analysis to give the thiourea, LCMS [M+H]+ 281.0, RT 1.336 minutes, purity 100% (Method 15).

According to the analysis of related databases, 149978-43-8, the application of this compound in the production field has become more and more popular.

Reference:
Patent; UCB BIOPHARMA SRL; CHOVATIA, Prafulkumar Tulshibhai; CONNELLY, Rickki Lee; FRANKLIN, Richard Jeremy; HASLETT, Gregory William; HENRY, Alistair James; MADDEN, James; NEUSS, Judi Charlotte; NORMAN, Timothy John; PHILPS, Oliver; PITT, William Ross; RAMPALAKOS, Konstantinos; SELBY, Matthew Duncan; SELVARATNAM, Suganthan; TRANI, Giancarlo; ZHU, Zhaoning; (768 pag.)WO2019/243550; (2019); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Application of 128694-63-3, The chemical industry reduces the impact on the environment during synthesis 128694-63-3, name is 1-Methyl-3-(trifluoromethyl)-1H-pyrazole-5-carboxylic acid, I believe this compound will play a more active role in future production and life.

Example 309 Production of N-[5-({2-[(cyclopropylcarbonyl)amino]imidazo[1,2-b]pyridazin-6-yl}oxy)-2-methylphenyl]-1-methyl-3-(trifluoromethyl)-1H-pyrazole-5-carboxamide In the same manner as in Example 259 and using 1-methyl-3-(trifluoromethyl)-1H-pyrazole-5-carboxylic acid (160 mg, 0.80 mmol), tetrahydrofuran (5 mL), N,N-dimethylformamide (1 drop), oxalyl chloride (170 muL, 2.0 mmol), N-[6-(3-amino-4-methylphenoxy)imidazo[1,2-b]pyridazin-2-yl]cyclopropanecarboxamide (200 mg, 0.62 mmol) and N,N-dimethylacetamide (7 mL) as starting materials, the title compound (240 mg, 76%) was obtained as a white solid. 1H-NMR (DMSO-d6, 300 MHz) delta 0.74-0.86 (4H, m), 1.86-1.97 (1H, m), 2.27 (3H, s), 4.15 (3H, s), 7.05 (1H, d, J=9.6 Hz), 7.13 (1H, dd, J=8.3, 2.6 Hz), 7.30 (1H, d, J=2.6 Hz), 7.37 (1H, d, J=8.3 Hz), 7.49 (1H, s), 7.94 (1H, s), 8.04 (1H, d, J=9.6 Hz), 10.13 (1H, s), 11.08 (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, 1-Methyl-3-(trifluoromethyl)-1H-pyrazole-5-carboxylic acid, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; TAKEDA PHARMACEUTICAL COMPANY LIMITED; US2009/137595; (2009); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

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. 39753-81-6, name is Ethyl 2-(4-nitro-1H-pyrazol-1-yl)acetate, A new synthetic method of this compound is introduced below., Application In Synthesis of Ethyl 2-(4-nitro-1H-pyrazol-1-yl)acetate

Under hydrogen (1 atm), to a solution of compound 33-b (1.0 g, 5 mmol) in methanol (10 mL) was added 10% Pd-C (0.1 g). The mixture was stirred at 25 C. for 12 hours, and then filtrated, the filtrate was concentrated under reduced pressure to give compound 33-a (760 mg, yield: 90%), which was used directly for the next step without purification. LC-MS (ESI): m/z=170 [M+H]+.

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.

Reference:
Patent; SHANGHAI CHEMEXPLORER CO., LTD.; XU, Zusheng; ZHANG, Nong; SUN, Qingrui; WANG, Tinghan; US2015/336982; (2015); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

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. 214614-81-0, name is 4-Bromo-1-(2-hydroxyethyl)pyrazole, A new synthetic method of this compound is introduced below., Product Details of 214614-81-0

General procedure: To a solution of 4-bromo-1-(oxan-4-yl)-1H-pyrazole 26a (1.00 g, 4.33 mmol) and 4,4,5,5-tetramethyl-2-(tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3,2-dioxaborolane (1.32 g, 5.19 mmol) in 10 mL of DMF was added potassium acetate (1.27 g, 12.98 mmol), followed by 1,1′-bis(diphenylphosphino)ferrocene-palladium(II)dichloride dichloromethane complex (177 mg, 0.22 mmol) under argon. The resulting mixture was stirred at 80 C for 10 h and then diluted with 40 mL of water. The mixture was extracted with EA (3 × 30 mL). The combined organic phase was washed with water (3 × 30 mL), brine, dried over anhydrous Na2SO4 and concentrated under vacuum. The crude product was purified by silica gel column chromatography (EA/PE, 1:4) to afford 25c as white solid in 68% yield.

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.

Reference:
Article; Zhang, Dengyou; Zhang, Xiaowei; Ai, Jing; Zhai, Yun; Liang, Zhongjie; Wang, Ying; Chen, Yi; Li, Chunpu; Zhao, Fei; Jiang, Hualiang; Geng, Meiyu; Luo, Cheng; Liu, Hong; Bioorganic and Medicinal Chemistry; vol. 21; 21; (2013); p. 6804 – 6820;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Electric Literature of 4027-57-0, These common heterocyclic compound, 4027-57-0, name is Ethyl 5-methylpyrazole-3-carboxylate, 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 4; Preparation of 3-formyl-5-methylpyrazole; Under nitrogen environment, 3-ethoxycarbonyl-5-methylpyrazole (1.0 g, 4.34 mmol) was dissolved in 15 ml of purified toluene, and DIBAL (8.68 ml, 8.62 mmol) was slowly added and stirred at -78 C. The reaction progress and completion were confirmed using TLC (hexane:EtOAc=6:1). Upon completion of the reaction, MeOH and water were slowly added to the reaction mixture and the resulting mixture was filtered through a celite bed, and the aqueous layer was extracted with EtOAc. The organic layer was dried over anhydrous MgSO4, filtered and concentrated under reduced pressure. The concentrate was separated by column chromatography (hexane:EtOAc:CH2Cl2=3:1:1) to obtain the title compound. Yield: 82.4% 1H NMR (300 MHz, CDCl3) delta 9.92 (s, 1H), 6.68 (s, 1H), 2.82 (s, 3H)

Statistics shows that Ethyl 5-methylpyrazole-3-carboxylate is playing an increasingly important role. we look forward to future research findings about 4027-57-0.

Reference:
Patent; Korea Institute of Science and Technology; US2007/49604; (2007); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics