Category: pyrazoles-derivatives

Adding a certain compound to certain chemical reactions, such as: 14531-55-6, name is 3,5-Dimethyl-4-nitro-1H-pyrazole, belongs to pyrazoles-derivatives 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 14531-55-6, Quality Control of 3,5-Dimethyl-4-nitro-1H-pyrazole

(0927) Step A (0928) To a solution of 3,5-dimethyl-4-nitro-1H-pyrazole (0.5 g, 3.54 mmol) in acetonitrile (10 mL), K2CO3 (1.4 g, 10.62 mmol) was added and the mixture was stirred at room temperature for 30 minutes. Then 1-bromo-2-fluoroethane (0.67 g, 5.31 mmol) was added dropwise. The mixture was heated at reflux overnight. To the cooled reaction mixture H2O (20 ml) was added. The mixture was extracted with ethyl acetate (3×50 ml), the organic layers were combined, dried over Na2SO4 and evaporated under reduced pressure. The residue was purified on HP-Sil SNAP cartridges using a Biotage Isolera One purification system employing an EtOAc/n-heptane gradient (5/95->40/60) to afford the title compound which was used in the next step without further purification (0.515 g, 77%). (0929) 1H-NMR (400 MHz, DMSO-d6) delta=4.80 (t, 1H), 4.68 (t, 1H), 4.48 (t, 1H), 4.41 (t, 1H), 2.57 (s, 3H), 2.40 (s, 3H).

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-Dimethyl-4-nitro-1H-pyrazole, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; AC IMMUNE SA; PIRAMAL IMAGING SA; KROTH, Heiko; NAMPALLY, Sreenivasachary; MOLETTE, Jerome; GABELLIERI, Emanuele; BENDERITTER, Pascal Andre Rene; FROESTL, Wolfgang; SCHIEFERSTEIN, Hanno; MUELLER, Andre; SCHMITT-WILLICH, Heribert; BERNDT, Mathias; (228 pag.)US2017/2005; (2017); 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. 82560-12-1, name is 3-Amino-5-tert-butylpyrazole, A new synthetic method of this compound is introduced below., Safety of 3-Amino-5-tert-butylpyrazole

5-tert-Butyl-2H-pyrazol-3-ylamine (1.11 g, 8.00 mmol), potassium carbonate (2.32 g, 16.8 mmol), copper (I) iodide (0.076 g, 0.40 mmol), and 3-bromo-5- methylphenol (1.80 g, 9.60 mmol) were weighed into a large microwave vial. This was then purged with argon then trans-N,N-dimethylcyclohexane-l,2-diamine (0.25 mL, 1.60 mmol) added. To this mixture was then added degassed toluene (8 mL). The mixture was then purged with argon again, the vial sealed, and heated for 1 h at 140 C in the microwave, then a further 4 h at 135 C. The mixture was cooled, diluted with ethyl acetate and passed through a pad of celite/silica, washing with more ethyl acetate. The dark solution was concentrated in vacuo. The residue was purified by FCC, using 0-40% DCM in EtOAc, to give the title compound (966 mg, 49%). NMR (300 MHz, CDC13): 1.32 (9H, s), 2.24 (3H, s), 3.82 (2H, br s), 5.49 (1H, s), 6.45-6.52 (1H, m), 6.65-6.71 (1H, m), 6.85-6.91 (lH, m).

The synthetic route of 82560-12-1 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; CHIESI FARMACEUTICI S.P.A.; ALCARAZ, Lilian; HURLEY, Christopher; CRIDLAND, Andrew, Peter; JENNINGS, Andrew, Stephen, Robert; WO2014/195402; (2014); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

These common heterocyclic compound, 5334-40-7, name is 4-Nitro-1H-pyrazole-3-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. Application In Synthesis of 4-Nitro-1H-pyrazole-3-carboxylic acid

15A. Synthesis of 5,6-dimethoxy-2-(4-m’tro-lH-pwazol-3-ylVlH-benzimidazoleTo a solution of EDC (4.81 g 25 mmol), HOBt (3.40 g, 25 mmol) and triethylamine (4.67 g, 46 mmol) in DMF (100 ml) was added 4-nitro-lH-pyrazole-3-carboxylic acid (3.63 g, 23.09 mmol) and 4,5-dimethoxy-benzene-l,2-diamine dihydrochloride (5.06g, 20.99 mmol) and the mixture was stirred at room temperature overnight. The solvent was removed in vacuo and the resulting solid partitioned between EtOAc (50 ml) and saturated aqueous NaHCO3 (50 ml). A precipitate was formed and removed by filtration. The filtrate was washed with water followed by diethyl ether and then azeotroped with MeOH and toluene to yield 4- nitro-lH-pyrazole-3- carboxylic acid (2-amino-4,5-dimethoxy-phenyl)- amide (2.35 g, 36percent). 4-Nitro-lH-pyrazole- 3-carboxylic acid (2-amino-4,5-dimethoxy-phenyl)-amide (2.35g, 7.65 mmol) was dissolved in acetic acid (150 ml) and refluxed at 140° C for 5 hours. The solution was left to cool and the solvent removed in vacuo. The resulting solid was partitioned between EtOAc (25 ml) and brine (25 ml). The organic layer was separated, dried (MgSO4), filtered and the solvent removed in vacuo to yield 5,6-dimethoxy-2-(4-nitro-lH-pyrazol-3-yl)-lH-benzimidazol (2.08 ft 94percent).

The synthetic route of 4-Nitro-1H-pyrazole-3-carboxylic acid has been constantly updated, and we look forward to future research findings.

Reference:
Patent; ASTEX THERAPEUTICS LIMITED; WO2007/77435; (2007); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Electric Literature of 345637-71-0,Some common heterocyclic compound, 345637-71-0, name is 2-(5-Methyl-3-(trifluoromethyl)-1H-pyrazol-1-yl)acetic acid, molecular formula is C7H7F3N2O2, 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.

Oxalylchloride (0.32 g, 2.6 mmol) and then one drop of N,Ndimethylformamidewere consecutively added to a solution of (5-methyl-3-trifluoromethyl-pyrazol-1-yl)-acetic acid (0.45 g, 2.1 mmol) in 8 ml ofdichloromethane. The resulting mixture was stirred for 16 h at room temperatureand evaporated under reduced pressure. The residue was dissolved in 5 ml ofdichloromethane and added to a solution of ethyl 2-[2-(methylamino)ethyl]thiazole-4-carboxylate (23b, 0.65 g, 2.6 mmol) andtriethylamine (1.0 g, 10 mmol) in 5 ml of dichloromethane. The reaction mixturewas stirred for 4 h at room temperature, then diluted with water and extractedwith dichloromethane. The organic layer was washed with water and brine,dried over sodium sulfate and evaporated under reduced pressure, the remainderwas purified by chromatography on silica gel, using ethyl acetate / cyclohexane1 : 1 as eluent system to obtain ethyl 2-[2-[methyl-[2-[5-methyl-3-(trifluoromethyl)pyrazol-1-yl]acetyl]amino]ethyl] thiazole-4-carboxylate (24b,0.39 g, 1.0 mmol, 44 %).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 2-(5-Methyl-3-(trifluoromethyl)-1H-pyrazol-1-yl)acetic acid, its application will become more common.

Reference:
Article; Sulzer-Mosse, Sarah; Lamberth, Clemens; Kubizna, Peter; Synlett; vol. 28; 17; (2017); p. 2277 – 2280;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Synthetic Route of 1082745-50-3,Some common heterocyclic compound, 1082745-50-3, name is 5-Amino-1-(tetrahydro-2H-pyran-4-yl)-1H-pyrazole-4-carboxamide, molecular formula is C9H14N4O2, 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 5-amino-1-(tetrahydro-2H-pyran-4-yl)-1H-pyrazole-4-carboxamide (1.0 g, 4.76 mmol) and triethyl orthoformate (7.72 g, 47.6 mmol) in DMSO (20 mL) was added Cs2CO3 (3.1 g 9.5 mmol). The mixture was stirred at 130 C. for 36 hours. The mixture was diluted with water (100 mL) and extracted with DCM (30 mL*3). The organic layer was washed with water (30 mL*2) and dried over Na2SO4. The organic layer was evaporated under vacuum. The mixture was purified by silica gel chromatography (DCM: MeOH from 20:1 to 5:1) to give 6-methyl-1-(tetrahydro-2H-pyran-4-yl)-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one (560 mg, 50% yield).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 5-Amino-1-(tetrahydro-2H-pyran-4-yl)-1H-pyrazole-4-carboxamide, its application will become more common.

Reference:
Patent; H. Lundbeck A/S; Juhl, Karsten; Jessing, Mikkel; Langgard, Morten; Vital, Paulo Jorge Vieira; Marigo, Mauro; Kehler, Jan; Rasmussen, Lars Kyhn; (27 pag.)US2017/291901; (2017); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Adding a certain compound to certain chemical reactions, such as: 16461-94-2, name is 4-Bromo-1H-pyrazol-3-amine, belongs to pyrazoles-derivatives 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 16461-94-2, Quality Control of 4-Bromo-1H-pyrazol-3-amine

Step 2 :4-(3-Bromopyrazolori,5-a1pyrimidin-6-yl)phenol; A mixture of 3-(dimethylamino)-2-(4-hydroxyphenyl)acrylaldehyde (5.00 g, 0.026 mol), 3-amino-4- bromopyrazole (4.23 g, 0.026 mol), 84 mL of ethanol and 4.2 mL of acetic acid was refluxed for 12 h. The mixture was cooled and the precipitate filtered off, washed twice with water and a small amount of ethanol, then dried in vacuum at 40-500C for 8 h. to give the desired phenol. Yield: 4.66 g (61.5%).

If you are interested in these compounds, you can also browse my other articles.Thank you for taking the time to read this article. I hope you enjoyed it.

Reference:
Patent; MERCK SHARP & DOHME LIMITED; MERCK & CO., INC.; WO2007/85873; (2007); 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. 35100-92-6, name is 1,5-Dimethyl-1H-pyrazol-3-amine, This compound has unique chemical properties. The synthetic route is as follows., category: pyrazoles-derivatives

Example 65 Synthesis of N-(1,5-Dimethyl-1H-pyrazol-3-yl)-7-(3,5-dimethylisoxazol-4-yl)-6-methoxy-2-methyl-9H-pyrimido[4,5-b]indol-4-amine (Cpd. No. 115) Pd2(dba)3 (27 mg, 0.03 mmol) and BINAP (37 mg, 0.06 mmol) were mixed in anhydrous toluene (5 mL). The mixture was heated at reflux for 3-4 minutes. This clear, orange-red color solution was transferred into a round-bottom flask containing S13 (102 mg, 0.3 mmol), 1,5-dimethyl-1H-pyrazol-3-amine (70 mg, 0.6 mmol), K3PO4 (212 mg, 1.0 mmol), and anhydrous toluene (5 mL). The mixture was heated at reflux for overnight before quenching with methanol. The reaction mixture was filtered through a pad of Celite and the organic layer was collected, concentrated, and purified by HPLC to yield Cpd. No. 115 in 31 mg as a CF3CO2H salt. 1H NMR (300 MHz, MeOD-d4): 8.24 (s, 1H), 7.46 (s, 1H), 6.25 (s, 1H), 3.98 (s, 3H), 3.90 (s, 3H), 2.84 (s, 3H), 2.39 (s, 3H), 2.33 (s, 3H), 2.16 (s, 3H). ESI-MS calculated for C22H24N7O2 [M+H]+=418.20, Observed: 418.50.

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 35100-92-6.

Reference:
Patent; THE REGENTS OF THE UNIVERSITY OF MICHIGAN; Wang, Shaomeng; Zhao, Yujun; Zhou, Bing; Aguilar, Angelo; Liu, Liu; Bai, Longchuan; McEachern, Donna; Sun, Duxin; Wen, Bo; Luo, Ruijuan; Zhao, Ting; Chinnaiyan, Arul; Asangani, Irfan A.; Stuckey, Jeanne; Meagher, Jennifer Lynn; Ran, Xu; US2015/246923; (2015); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Related Products of 29097-00-5, A common heterocyclic compound, 29097-00-5, name is Methyl 3-amino-1H-pyrazole-4-carboxylate, molecular formula is C5H7N3O2, 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 solution of 5-aminopyrazole 5g (1 mmol) and ynone 7 (1 mmol) inMeOH (1 mL) was added dropwise to a mixture of AcOH (0.5 mL) andwater (10 mL) and the mixture was stirred at r.t. for 7 days. The productwas extracted by CH2Cl2 (3×25 mL) and the combined organic phaseswere dried over anhydrous Na2SO4, filtered, and the filtrate was evaporatedin vacuo. The residue was purified by CC (EtOAc/hexanes).Fractions containing the product were combined and evaporated invacuo to give 10.

The synthetic route of 29097-00-5 has been constantly updated, and we look forward to future research findings.

Reference:
Article; Petek, Nejc; ?tefane, Bogdan; Novinec, Marko; Svete, Jurij; Bioorganic Chemistry; vol. 84; (2019); p. 226 – 238;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Electric Literature of 26621-44-3, 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. 26621-44-3 name is 3-Nitro-1H-pyrazole, 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.

To a mixture of 3-nitro-1H-pyrazole (10 g, 88.44 mmol) in DMF (80 mL) was added NaH (4.24 g, 106.13 mmol, 60% purity) in portions at 0 C. Then to the mixture was added SEM-Cl (17.69 g, 106.13 mmol, 18.78 mL) dropwise at 0C. The mixture was stirred at 25 C for 1 h. The resulting mixture was diluted with water and extracted with EtOAc (50 mL×3). The combined organic layers were washed with brine (50 mL×3), dried over Na2SO4, filtered and concentrated under reduced pressure to give a residue. The residue was purified by column chromatography (SiO2, Petroleum ether/Ethyl acetate=1:0 to 5:1, Rf = 0.7,0.75) to provide the title compound (29.5 g, crude) as a yellow oil.

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

Reference:
Patent; KADMON CORPORATION, LLC; LIU, Kevin G.; OLSZEWSKI, Kellen L.; KIM, Ji-In; POYUROVSKY, Masha V.; MORRIS, Koi; YU, Xuemei; LAMARQUE, Christophe; (0 pag.)WO2020/5935; (2020); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Adding a certain compound to certain chemical reactions, such as: 948570-75-0, name is 1-(2-Methoxyethyl)-4-nitro-1H-pyrazole, belongs to pyrazoles-derivatives 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 948570-75-0, COA of Formula: C6H9N3O3

The 1 – (2 – methoxy ethyl) -4 – nitro – 1H – pyrazole (5 g, 29.21 mmol) dissolved in ethanol (25 ml) and ethyl acetate (25 ml) in, add Raney nickel (500 mg), under the hydrogen environment reaction 5 hours. Diatomite filter, evaporating the filtrate, a brown solid 3.6 g, yield 87%.

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 1-(2-Methoxyethyl)-4-nitro-1H-pyrazole, and friends who are interested can also refer to it.

Reference:
Patent; Beijing Seth Ming Qiang Pharmaceutical Technology Co., Ltd.; Zhang Qiang; Liu Yansheng; Li Xingfu; Hu Chenming; (96 pag.)CN109535132; (2019); A;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics