Category: pyrazoles-derivatives

Some common heterocyclic compound, 199678-06-3, name is 4-(1-Methyl-1H-pyrazol-4-yl)benzoic acid, molecular formula is C11H10N2O2, 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-(1-Methyl-1H-pyrazol-4-yl)benzoic acid

EXAMPLE 55 [4-(1-Methyl-1H-pyrazol-4-yl)-phenyl]-(5H,11H-pyrrolo[2,1-c][1,4]-benzodiazepin-10-yl)-methanone Oxalyl chloride (0.30 g) was added to a suspension of 4-(1-methyl-1H-pyrazol-4-yl)-benzoic acid (0.46 g) in dichloromethane (25 ml). Two drops of dimethylformamide were added and the mixture was stirred for 18 hours at room temperature. The resultant solution was evaporated to dryness to yield the crude acid chloride (0.57 g), which was utilized without further purification. The acid chloride was added to a solution of 10,11-dihydro-5H-pyrrolo[2,1-c][1,4]-benzodiazepine (0.37 g) and diisopropylethylamine (0.58 g) in dichloromethane (50 ml). After 18 hours at room temperature, the reaction mixture was washed with water and saturated aqueous sodium bicarbonate. The dichloromethane solution was dried over anhydrous sodium sulfate and filtered through a short column of hydrous sodium magnesium silicate and further eluted with several volumes of dichloromethane. The combined organic phase was concentrated on a hot plate with the gradual addition of hexane until crystallization occurred. After cooling, the crystals were collected by filtration to yield the title compound (0.38 g), m.p. 200-201 C.; MS m/z: 368 (M)+.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 199678-06-3, its application will become more common.

Reference:
Patent; Wyeth; US6511974; (2003); B1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Reference of 143426-49-7, A common heterocyclic compound, 143426-49-7, name is (4-Pyrazol-1-yl-phenyl)methanol, molecular formula is C10H10N2O, 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.

To a stirred solution of 4-(1 H-pyrazol-1 -yl)phenyl)methanol (0.2 g, 1.14 mmol) in DCM (10 mL), SOCI2 (0.2 mL, 2.29 mmol) was added at 0 C and the reaction mixture was stirred for 2 h. After completion of reaction, the reaction mixture was concentrated under vacuum and co-distilled with DCM to get the title compound. It was used in the next step without further purification. Yield: (0.170 g, brown gummy solid). LCMS: (Method A) 193.1 (M+H), Rt. 3.46 min, 94.32% (Max).

The synthetic route of 143426-49-7 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; ASCENEURON S. A.; QUATTROPANI, Anna; WISHART, Grant; KULKARNI, Santosh S.; RAKESH, Paul; (338 pag.)WO2020/39027; (2020); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Reference of 423768-52-9,Some common heterocyclic compound, 423768-52-9, name is 3-(Aminomethyl)-1,5-dimethylpyrazole, molecular formula is C6H11N3, 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 ethyl 2-(2-amino-4,6-dichloropyrimidin-5-yl)acetate (200 mg, 0.80 mmol) in EtOH (30 mL) was added (l,5-dimethyl-lH-pyrazol-3-yl)methanamine (300 mg, 2.40 mmol) and Et3N (400 mg, 3.96 mmol). The resulting solution was refluxed for 3 hours. The reaction mixture was concentrated under vacuum. The residue was purified on a silica gel column with DCMrMeOH (50:1), resulted in 0.25 g (31%) of ethyl 2-(2-amino-4-chloro- 6-((l,5-dimethyl-lH-pyrazol-3-yl) methylamino)pyrimidin-5-yl)acetate as a yellow solid

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 3-(Aminomethyl)-1,5-dimethylpyrazole, its application will become more common.

Reference:
Patent; PONIARD PHARMACEUTICALS, INC.; WO2009/139834; (2009); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Related Products of 920006-32-2,Some common heterocyclic compound, 920006-32-2, name is 1-Isopropylpyrazole-5-carboxylic Acid, molecular formula is C7H10N2O2, 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.

A mixture of 2-isopropylpyrazole-3-carboxylic acid (50 mg, 291.89 mumol, 1 eq), 2-methyl-4-[(E)-2-(o-tolyl) vinyl]aniline (93.12 mg, 291.89 mumol, 1 eq), T3P (1.86 g, 2.92 mmol, 1.74 mL, 50%, 10 eq) in pyridine (5 mL) was stirred at 60 C. for 2 h. The mixture was concentrated under reduced pressure to give a residue which was purified by preparative HPLC (column: Phenomenex Gemini 150*25 mm*10 um; mobile phase: [water(0.05% HCl)-ACN]; B %: 55%-85%, 10 min). The mixture was lyophilized, purified by preparative TLC (SiO2, PE/EtOAc=5/1, Rf=0.57) to give 2-isopropyl-N-[2-methyl-4-[(E)-2-(o-tolyl)vinyl]phenyl]pyrazole-3-carboxamide (compound I-42, 18.26 mg, 48.58 mumol, 16.6% yield, 95.6% purity) as an off-white solid. 1H NMR (400 MHz, CDCl3) delta ppm 7.95 (d, J=8.0 Hz, 1H), 7.60-7.55 (m, 3H), 7.40-7.39 (m, 2H), 7.30 (d, J=16.0 Hz, 1H), 7.19-7.17 (m, 3H), 6.96 (d, J=16.0 Hz, 1H), 6.61 (s, 1H), 5.57-5.47 (m, 1H), 2.44 (s, 3H), 2.35 (s, 3H), 1.54 (d, J=6.8 Hz, 6H); ES-LCMS m/z 360.2 [M+H]+.

The synthetic route of 920006-32-2 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Kyn Therapeutics; Castro, Alfredo C.; Evans, Catherine Anne; (108 pag.)US2019/55218; (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. 153687-35-5, name is 1-(4-Methoxybenzyl)-1H-pyrazole-4-carbaldehyde, This compound has unique chemical properties. The synthetic route is as follows., name: 1-(4-Methoxybenzyl)-1H-pyrazole-4-carbaldehyde

1H-PYRAZOLE-4-CARBALDEHYDE (55). To a solution of 1- (4-METHOXY-BENZYL)-1H- pyrazole (0.21 mol) (Synth. Commun. 1990, 20/18 ; 2849) in dry DMF (235 ml) was added POCL3 (1.5 eq. ) dropwise at room temperature. The mixture was then heated at 95C for 16 hrs. After cooling to room temperature, the reaction mixture was neutralized by adding ice and saturated sodium carbonate solution. EtOAc (800 ml) was added and the organic layer was separated and washed several times with water. After drying (Na2SO4), the solvent was removed and the crude product was purified over silica gel to give 16.4 g (35% yield) desired aldehyde 1-(4-METHOXY-BENZYL)-LH- pyrazole-4-carbaldehyde. It was heated with 150 ml TFA for 2 hrs. TFA was evaporated and the basified crude product was purified on silica gel to give 5.3 g of 55.

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 153687-35-5.

Reference:
Patent; IMCLONE SYSTEMS INCORPORATED; WO2005/813; (2005); 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. 15803-02-8, name is 4-Bromo-1-methyl-1H-pyrazole belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below. HPLC of Formula: C4H5BrN2

A. Synthesis of 1-(1-methyl-1H-pyrazol-4-yl)ethanone 4-Bromo-1-methyl-1H-pyrazole (41.3 mL, 400 mmol), was dissolved in tetrahydrofuran (750 mL) and cooled to -78 C. N-Butyllithium (2.5 M solution in hexanes, 160 mL, 400 mmol) was added drop-wise over 30 minutes, and the resulting mixture was stirred for 1 hour at -78 C. After drop-wise addition of a solution of N-methoxy-N-methylacetamide (40.9 mL, 400 mmol) in tetrahydrofuran (100 mL) to the -78 C. reaction mixture, the cooling bath was allowed to warm to 0 C. over 4 hours. The reaction was then quenched with saturated aqueous sodium chloride solution (50 mL), and volatiles were removed in vacuo. The residue was diluted with ethyl acetate (1000 mL), treated with magnesium sulfate, and stirred for 30 minutes before being filtered and concentrated in vacuo. Purification was carried out via silica gel chromatography (material was loaded in a minimum amount of dichloromethane; Gradient: 5% to 100% ethyl acetate in heptane) to provide a pale yellow oil that solidified on standing. Yield: 28.5 g, 230 mmol, 57%. 1H NMR (500 MHz, CDCl3) delta 2.37 (s, 3H), 3.90 (s, 3H), 7.83 (s, 1H), 7.84 (s, 1H).

The synthetic route of 15803-02-8 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Pfizer Inc.; US2012/214791; (2012); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Application of 2654-57-1, 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. 2654-57-1, name is 4-Methyl-1-phenylpyrazolidin-3-one belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below.

(a) 3-hydroxy-4-methyl-1-(4-nitro-phenyl)-1H-pyrazole 8.00 g (45.4 mmol) 4-methyl-1-phenyl-1H-pyrazolidin-3-one are added to 80 ml conc. sulphuric acid at -5 C. with stirring and stirred for another 5 min. Then 3.8 ml (54.5 mmol) 65% nitric acid are added with cooling such that the temperature remains between -15 and -10 C. The reaction mixture is stirred for 1 h between -20 and -5 C., then poured into ice water and suction filtered. The filter cake is washed with water, dried at 55 C. and further reacted without any further purification. Yield: 8.00 g (approx. 40%), approx. 50% C10H9N3O3 (219.20) Rf value: 0.70 (silica gel; cyclohexane/ethyl acetate=1:1)

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, 4-Methyl-1-phenylpyrazolidin-3-one, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; Dahmann, Georg; Gerlach, Kai; Pfau, Roland; Priepke, Henning; Wienen, Wolfgang; Schuler-Metz, Annette; Nar, Herbert; US2008/51578; (2008); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Some common heterocyclic compound, 128694-63-3, name is 1-Methyl-3-(trifluoromethyl)-1H-pyrazole-5-carboxylic acid, molecular formula is C6H5F3N2O2, 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. Computed Properties of C6H5F3N2O2

Reference Example 3A mixture of 0.19 g of 1-methyl-3-trifluoromethyl-1H-pyrazole-5-carboxylic acid, 0.15 g of thionyl chloride and 5 mL of hexane was heated to reflux for 2 hours. The reaction mixture was concentrated under reduced pressure to obtain 0.14 g of 1-methyl-3-trifluoromethyl-1H-pyrazole-5-carbonyl chloride. To a mixture of 0.22 g of N-(2-aminobenzoyl)-N’-ethoxycarbonylhydrazine and 10 mL of pyridine was added 0.14 g of the resulting 1-methyl-3-trifluoromethyl-1H-pyrazole-5-carbonyl chloride, and the mixture was stirred at room temperature for 2 hours. Water was poured into the reaction mixture, and a formed precipitate was collected by filtration to obtain 0.23 g of a compound I-(3). 1H-NMR (DMSO-d6, TMS) delta(ppm): 1.20 (3H, t, J=8 Hz), 4.10 (2H, q, J=8 Hz), 4.19 (3H, s), 7.17 (1H, s), 7.28 (1H, t, J=8 Hz), 7.60 (1H, t, J=8 Hz), 7.79 (1H, d, J=8 Hz), 8.37 (1H, d, J=8 Hz), 9.02 (1H, brs), 10.41 (1H, brs), 11.50 (1H, brs)

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 128694-63-3, its application will become more common.

Reference:
Patent; Natsuhara, Katsuya; Nishimura, Shinya; US2010/99692; (2010); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Electric Literature of 51516-68-8,Some common heterocyclic compound, 51516-68-8, name is 5-Amino-1-(3-chlorophenyl)-1H-pyrazole-4-carbonitrile, molecular formula is C10H7ClN4, 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: The experimental procedure was similar to synthesis of analogs1(aei). 5-amino-1-aryl-1H-pyrazole-4-carbonitriles 4(aei)(0.001 mol) were reacted with 2.0 mL of 1,3-diaminopropane andcarbon disulfide (0.004 mol). The temperaturewas 85-95oC and thereaction time was 14-16 hours. The reaction mixture was pouredinto cold water, the precipitate was filtered out and washed withcold water. The reactions were accompanied by means of TLC anddichloromethane as eluent.

The synthetic route of 51516-68-8 has been constantly updated, and we look forward to future research findings.

Reference:
Article; Monteiro; Lechuga; Lara; Souto; Vigano; Bourguignon; Calvet; Oliveira; Alves; Souza-Silva; Santos; Pereira; European Journal of Medicinal Chemistry; vol. 182; (2019);,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Electric Literature of 947763-34-0, 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. 947763-34-0, name is 1-Ethyl-3-methyl-1H-pyrazol-4-amine belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below.

A solution of 1-ethyl-3-methyl-1H-pyrazol-4-ylamine (1.345 g, 10.75 mmol, commercially available) and (6-trifluoromethyl-pyridin-3-yl)-acetonitrile (distilled 166-175 C./2 mb, 1.0 g, 5.4 mmol) in MeOH (10 mL) was treated with HCO2NH4 (1.694 g, 26.86 mmol) and 10% Pd/C (200 mg) and stirred at 80 for 1.5 h. Filtration, concentration and purification by HPLC afforded the title compound (0.213 g, 13%) as a light brown oil. MS m/e: 299.3 [M+H]+.

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-Ethyl-3-methyl-1H-pyrazol-4-amine, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; Knust, Henner; Nettekoven, Matthias; Pinard, Emmanuel; Roche, Olivier; Rogers-Evans, Mark; US2009/312314; (2009); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics