Category: pyrazoles-derivatives

Electric Literature of 866837-96-9,Some common heterocyclic compound, 866837-96-9, name is Ethyl 5-amino-1-phenyl-1H-pyrazole-3-carboxylate, molecular formula is C12H13N3O2, 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.

5-(3,3-Dimethyl-2-oxo-butylamino)-1 -phenyl-1 H-pyrazole-3-carboxylic acid ethyl ester; O,6g (25,9mmol) of 5-Amino-1 -phenyl-1 H-pyrazole-3-carboxylic acid ethyl ester are dissolved in 50ml DMF, 4,65g (25,9mmol) 1 -bromopinacolone and 16g (49.1 mmol, 1 ,9eq) of Cs2CO3 are added and the resulting mixture is heated to 100C for4hours.The reaction mixture is filtrated and the solvent removed in vacuo, the residue is subjected to preparative HPLC chromatography to obtain 2g (23%) of the product.

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

Reference:
Patent; SANOFI; RUF, Sven; SADOWSKI, Thorsten; HORSTICK, Georg; SCHREUDER, Herman; BUNING, Christian; OLPP, Thomas; WIRTH, Klaus; WO2012/101199; (2012); A1;,
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Reference of 180207-57-2, These common heterocyclic compound, 180207-57-2, name is 2-(1H-Pyrazol-4-yl)ethanol, 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-(1H-pyrazol-4-yl)ethan-1-ol (300 mg, 2.7 mmol) was dissolved in DCM (10 mL), DIPEA (1.9 mL) was added and the solution cooled at 0 C. Methanesulfonyl chloride (620 DL, 8.3 mmol) was added, the solution was stirred for 1 h, then it was diluted with DCM (20 mL) and extracted with 10% aqueous citric acid (2×20 mL) and water (20 mL). The organic layer was dried over MgSO4 and filtered. The solvent was removed under reduced pressure and the crude was purified by chromatography (cyclohexane/EtOAc 0?100%) to afford 2-(1-(methylsulfonyl)-1H-pyrazol-4-yl)ethyl methanesulfonate (450 mg, 62%). 1H NMR (500 MHz, DMSO-d6) delta 8.20 (d, J = 0.8 Hz, 1 H), 7.92 (d, J = 0.8 Hz, 1 H), 4.39 (t, J = 6.6 Hz, 2H), 3.50 (s, 3H), 3.17 (s, 3H), 2.91 (t, J = 6.6, 0.9 Hz, 2H).

Statistics shows that 2-(1H-Pyrazol-4-yl)ethanol is playing an increasingly important role. we look forward to future research findings about 180207-57-2.

Reference:
Patent; THE INSTITUTE OF CANCER RESEARCH: ROYAL CANCER HOSPITAL; MARAIS, Richard; SPRINGER, Caroline; NICULESCU-DUVAZ, Dan; MILLER, Natalie; ALJARAH, Mohammed; ZAMBON, Alfonso; LEUNG, Leo; SMITHEN, Deborah; BROWN, Michael; TANG, Haoran; (193 pag.)WO2019/73251; (2019); A1;,
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Synthetic Route of 124004-31-5, The chemical industry reduces the impact on the environment during synthesis 124004-31-5, name is 5-Amino-1H-pyrazole-3-carboxylic acid, I believe this compound will play a more active role in future production and life.

General procedure: The corresponding amino acid2, 4 (0.0173 mol) was dissolved in 2 aqueous l (50 ml),and the formed solution was cooled to 0 in an ice bath.Aqueous NaNO2 (0.019 mol) was dropwise added to thereaction mixture. The mixture was stirred for 30 min, thenaqueous NaN3 (0.026 mol) was carefully added. Thereaction mixture was stirred for 3-4 h. The formed precipitatewas filtered off on a fritted glass filter and washed witha small amount of H2O, then dried in a vacuum desiccatorover P2O5 to constant weight. The filtrate was extractedwith EtOAc, the organic phase was separated and driedover anhydrous Na2SO4. The dried organic phase wasevaporated under reduced pressure on the rotary evaporatorto afford a solid. Both solids were combined.5-Azido-1-pyrazole-3-carboxylic acid (5). Yield 2.32 g(87%), yellow solid, mp 164-165. IR spectrum, nu, cm-1:3309 (NH), 3101 (OH), 2125 (N3), 1675 (C=O). 1H NMRspectrum (400 MHz, DMSO-d6), delta, ppm: 13.76 (2, br. s,NH, COOH); 6.48 (1H, s, -4 pyrazole). 13C NMRspectrum (101 MHz, DMSO-d6), delta, ppm: 160.3; 147.6;136.9; 98.9. Found, m/z: 154.0363 [M+H]+. C4H4N5O2.Calculated, m/z: 154.0360. Found, %: C 31.51; H 1.82;N 45.37. 4H3N5O2. Calculated, %: C 31.38; H 1.98;N 45.74.

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, 5-Amino-1H-pyrazole-3-carboxylic acid, other downstream synthetic routes, hurry up and to see.

Reference:
Article; Dalinger, Aleksander I.; Medved?ko, Alexey V.; Balalaeva, Alexandra I.; Vatsadze, Irina ?.; Dalinger, Igor L.; Vatsadze, Sergey Z.; Chemistry of Heterocyclic Compounds; vol. 56; 2; (2020); p. 180 – 191;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Adding a certain compound to certain chemical reactions, such as: 23170-45-8, name is Methyl 3-methyl-1H-pyrazole-4-carboxylate, 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 23170-45-8, Recommanded Product: Methyl 3-methyl-1H-pyrazole-4-carboxylate

Methyl 3-methyl-1-(1-phenylethyl)-1H-pyrazole-4-carboxylate. To a solution of methyl 3-methyl-1H-pyrazole-4-carboxylate (280 mg, 2 mmol) in DMF (30 mL) was added (1-bromoethyl)benzene (0.37 g, 2 mmol) and potassium carbonate (0.55 g, 4 mmol). The mixture was stirred at 20 C and stirred for 12 h. The solvent was evaporated in vacuo and the residue was purified by HPLC (Column: Dsisol, 10mu, C18, 250 mm x 50 mm; Mobile: acetonitrile (0.1% formic acid)-water (0.1% formic acid), acetonitrile from 30 to 70 in 80 minutes; oven: 20 C; flow rate: 50 mL/minute, wavelength: 214 nm) to give methyl 3-methyl-1-(1-phenylethyl)-1H-pyrazole-4-carboxylate (90 mg, 19%, desired) and methyl 5-methyl-1-(1-phenylethyl)-1H-pyrazole-4-carboxylate (80 mg, 16%). The product was used for the next step directly.

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, Methyl 3-methyl-1H-pyrazole-4-carboxylate, other downstream synthetic routes, hurry up and to see.

Reference:
Article; Gehling, Victor S.; Vaswani, Rishi G.; Nasveschuk, Christopher G.; Duplessis, Martin; Iyer, Priyadarshini; Balasubramanian, Srividya; Zhao, Feng; Good, Andrew C.; Campbell, Robert; Lee, Christina; Dakin, Les A.; Cook, Andrew S.; Gagnon, Alexandre; Harmange, Jean-Christophe; Audia, James E.; Cummings, Richard T.; Normant, Emmanuel; Trojer, Patrick; Albrecht, Brian K.; Bioorganic and Medicinal Chemistry Letters; vol. 25; 17; (2015); p. 3644 – 3649;,
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Pyrazoles – an overview | ScienceDirect Topics

Synthetic Route of 3469-69-0,Some common heterocyclic compound, 3469-69-0, name is 4-Iodopyrazole, molecular formula is C3H3IN2, 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-Iodopyrazole (2.5 g, 1 equiv.) was dissolved in dry DMF (20 mL), and TEA (1.8 mL, 1 equiv.) was added at 0 C. Then, trityl chloride (3.56 g, 0.99 equiv.) was added, and the reaction mixture was stirred at 0 C to RT overnight. The mixture was then poured into ice water (250 mL) and was filtered. The obtained solid was washed with water (150 mL), and was then triturated with toluene (20 mL) and dried under vacuum to afford the expected product (3.48 g), which was used in the next reaction step without further purification.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 4-Iodopyrazole, its application will become more common.

Reference:
Patent; E-THERAPEUTICS PLC; JURKOVIC, Mihaela; LANDEK, Ivana Ozimec; POLJAK, Tanja; RO?CIC, Maja; STUBBERFIELD, Colin; VADLAMUDI, Srinivasamurthy; (228 pag.)WO2019/43372; (2019); A1;,
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Pyrazoles – an overview | ScienceDirect Topics

Electric Literature of 17635-45-9, 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. 17635-45-9, name is 4-Pyrazol-1-yl-phenylamine, This compound has unique chemical properties. The synthetic route is as follows.

EXAMPLE 25 1-Isopropyl-7-[4-(pyrazol-1-yl)phenylamino]-3,4-dihydro-pyrimido[4,5-d]pyrimidin-2(1H)-one; Compound With Trifluoroacetic Acid Prepared from 200 mg (0.79 mmol) of 1-isopropyl-7-methanesulfinyl-3,4-dihydro-pyrimido[4,5-d]pyrimidin-2(1H)-one, 250 mg (1.57 mmol) of 1-(4-aminophenyl)pyrazole and 182 muL (2.36 mmol) of trifluoroacetic acid in 3.2 mL of acetonitrile. After heating the reaction mixture overnight, a heavy precipitate forms. The cooled reaction mixture is diluted with ethyl acetate and filtered. The solids are washed with ethyl acetate and dried to give 315 mg (86percent) of the trifluoroacetate salt of the title compound: mp 249-252° C. (dec). Analysis calculated for C18H19N7O.C2HF3O2: C, 51.84; H, 4.35; N, 21.16. Found: C, 51.94; H, 4.37; N, 21.02.

The chemical industry reduces the impact on the environment during synthesis 4-Pyrazol-1-yl-phenylamine. I believe this compound will play a more active role in future production and life.

Reference:
Patent; Dobrusin, Ellen Myra; Hamby, James Marino; Kramer, James Bernard; Schroeder, Mel Conrad; Showalter, Howard Daniel Hollis; Toogood, Peter; Trumpp-Kallmeyer, Susanne A.; US2004/44012; (2004); 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. 133228-21-4, name is N,N-Dimethyl-1H-pyrazole-1-sulfonamide, A new synthetic method of this compound is introduced below., Recommanded Product: 133228-21-4

To a solution of [N-DIMETHYLSULFAMOYLPYRAZOLE] (44.0 g, 0.251 mol) in dry tetrahydrofuran (500 mL) at-78 C was added dropwise a solution of n-butyllithium (2.5 M in hexane, 105.5 mL, 0.264 mol) while maintaining the temperature [BELOW-60 C.] A thick solid formed during the addition. Upon completion of the addition the reaction mixture was maintained for an additional 15 minutes, after which time a solution of 1,2-dibromo- tetrachloroethane (90 g, 0.276 mol) in tetrahydrofuran (150 mL) was added dropwise while maintaining the temperature [BELOW-70 C.] The reaction mixture turned a clear orange; stirring was continued for an additional 15 minutes. The-78 [C] bath was removed and the reaction was quenched with water (600 mL). The reaction mixture was extracted with dichloromethane [(4X)] and the organic extracts were dried over magnesium sulfate and concentrated. The crude product was further purified by chromatography on silica gel using dichloromethane-hexane (50: 50) as eluent to afford the title product as a clear colorless oil (57.04 [G).] 1H NMR [(CDC13)] 8 3.07 (d, 6H), 6.44 (m, 1H), 7.62 (m, 1H).

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; E.I. DU PONT DE NEMOURS AND COMPANY; WO2004/11447; (2004); A2;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Reference of 7119-95-1, A common heterocyclic compound, 7119-95-1, name is 1-Nitropyrazole, molecular formula is C3H3N3O2, 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.

N-nitropyrazole is dissolved in benzonitrile, heated to 180 ° C, incubated for 3.5 h,cooled to 50-60 ° C after completion of thereaction, and added to n-hexane to make 3-nitrate The pyrazole is precipitated, filtered and dried to give 3-nitropyrazole;

The synthetic route of 7119-95-1 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Nanjing University of Science and Technology; Li Bindong; Zhu Xiang; (12 pag.)CN108570010; (2018); A;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Related Products of 31230-17-8, A common heterocyclic compound, 31230-17-8, name is 5-Methyl-1H-pyrazol-3-amine, molecular formula is C4H7N3, 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.

S-Ammo-S-methyl-pyrazole-l-carboxylic acid tert-butgammal esterNaH (95percent, 0.57g, 22.7mmol) was added slowly to a 00C solution of 3-Amino-5- methylpyrazole (2.Og, 20.6mmol) in THF (40ml). BoC2O (4.94g, 22.7mmol) was added after 30 min and the mixture was allowed to warm to room temperature. After stirring for 2 h at room temperature, the mixture was poured into a saturated aqueous solution of NaHCO3. The aqueous phase was extracted with CHCI3. The combined organic phases were dried over Na2SO4. Removal of the solvent in vacuum gave a crude mixture of the title compound and its 2-carboxylic acid tert.- butyl ester isomer, which were separated by chromatography on silica in ethyl acetate / heptane 2:1. Yield 2.4g, 59percent.1H-NMR: (400 MHz, D6-DMSO) 5.60 (IH, s), 5.27 (2H, s), 2.34 (3H, s), 1.51 (9H, s); MS (ESI+) = 198.26 (MH-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; F. HOFFMANN-LA ROCHE AG; WO2006/32518; (2006); 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., Quality Control of 3-Amino-5-tert-butylpyrazole

3-Tert-butyl-1H-pyrazol-5-amine (J-III) (1 eq., 40 g) was dissolved in dilute HCI (120 ml of HCI in 120 ml of water) and mixed dropwise with NaNO2 (1.03 eq., 25 g in 100 ml) at 0 – 5 0C over a period of 30 min. After stirring for 30 minutes, the reaction mixture was neutralised with Na2CO3. A diazonium salt obtained by reaction of KCN (2.4 eq., 48 g), water (120 ml) and CuCN (1.12 eq., 31 g) was added dropwise to the reaction mixture within 30 min and the mixture was stirred for a further 30 min at 75 0C. After complete reaction, the reaction mixture was extracted with EE (3 x 500 ml), the combined organic phases were dried over sodium sulphate and the solvent was removed under vacuum. The purification (SiO2, 20 % EE/hexane) of the residue by column chromatography produced a white solid (J-IV) (6.5 g, 15.1 % 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:
Patent; GRUeNENTHAL GMBH; FRANK, Robert; BAHRENBERG, Gregor; CHRISTOPH, Thomas; SCHIENE, Klaus; DE VRY, Jean; DAMANN, Nils; FRORMANN, Sven; LESCH, Bernhard; LEE, Jeewoo; KIM, Yong-Soo; KIM, Myeong-Seop; WO2010/127855; (2010); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics