Tag: M.W:100-200

2458-26-6, name is 3-Phenyl-1H-pyrazole, 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. Formula: C9H8N2

General procedure: A mixture of acetophenone and dimethylformamide dimethylacetal (2.0 equiv.) was refluxed overnight. The reaction mixture was allowed to cool down to room temperature and was concentrated under reduced pressure. The remaining residue was suspended in hexanes and filtered. The filter cake was washed with plenty of hexanes. (E)- 3-(dimethylamino)-l- phenylprop-2-en-l-one was obtained. (0260) Hydrazine-monohydrate (5.0 equiv.) was added to a solution of (E)- 3- (dimethylamino)-l-phenylprop-2-en-l-one in EtOH and the resulting reaction mixture was refluxed for 2 hours. The reaction was then allowed to cool down to room temperature and was concentrated under reduced pressure. The remaining residue was diluted with H2O and extracted with CH2CI2. The organic phase was dried over MgS04, filtered and concentrated under reduced pressure. The residue was considered pure enough by -NuMuKappa (>95%) to be used without further purification. (0261) A mixture of phenylpyrazole, iodoarene (1.0 equiv.), copper iodide (20 mol%), trans- (0262) 1,2-diaminocyclohexane (25 mol%), potassium carbonate (2.0 equiv.) in dioxane was stirred at 100C under argon for 16 hours. After cooling down to room temperature, the reaction mixture was diluted with H2O and extracted with EtOAC. The gathered organic phases were washed with NH4CI/NH3 (v/v : 1/1), brine, dried over MgSC , filtered and concentrated under reduced pressure. The remaining residue was purified by column chromatography on silica gel (Hexanes/EtOAc).

The synthetic route of 2458-26-6 has been constantly updated, and we look forward to future research findings.

Synthetic Route of 15953-45-4, These common heterocyclic compound, 15953-45-4, name is 5-Chloro-3-methyl-1H-pyrazole, 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.

(b) 5-Chloropyrazole-3-carboxylic acid..A mixture of 5-chloro-3-methylpyrazole (3.6 mmol; see step (a) above), water (6 mL) and terf-butanol (1.2 mL) was heated to 750C, after which KMnO4 (1.42 g, 9 mmol) was added. The mixture was stirred at 75C overnight and filtered hot. The solids were washed with boiling water. The combined cooled filtrates were extracted with EtOAc, and the combined extracts washed with NaCI (sat., aq.), dried (MgSO4) and concentrated. The crude solid was recrystallised from EtOAc/hexane/pentane to give the sub-title compound as white crystals (Yield: 350 mg (67%)). 1H-NMR (DMSO-d6, 400 MHz), delta 13.65 (br s, 1 H), 6.80 (s, 1 H). (d) 5-Chloropyrazole-3-carboxylic acid. A solution of KMnO4 (3.5 g, 22 mmol) in water (120 mL) was added in portions over a period of 5 h at 700C to a solution of 5-chloro-3-methylpyrazole (1.0 g, 8.8 mmol; see step (c) above) in water (50 mL) and terf-butanol (1 mL). The mixture was stirred at 7O0C overnight and filtered through Celite. The colourless filtrate was concentrated and acidified with HCI (aq., 2M). Filtration gave the title compound as a white powder which was used without further purification. (Yield: 913 mg, 80%). 1H-NMR (DMSO-d6): delta 6.80 (s, 1 H), 4.40 (br s, 1 H).

Statistics shows that 5-Chloro-3-methyl-1H-pyrazole is playing an increasingly important role. we look forward to future research findings about 15953-45-4.

Electric Literature of 49633-25-2, In the chemical reaction process, reaction time, type of solvent, can easily affect the result of the reaction, thereby determining the yield and properties of the reaction product. An updated downstream synthesis route of 49633-25-2 as follows.

[00754] Intermediate 80a: benzyl 2-(3-isopropylpyrazol-1 -yI)acetate[00755] 5-lsopropyl-1H-pyrazole (1 00mg, 0.91 mmol) and potassium carbonate (376mg, 2.72mmol) was left to stir in MeCN (3mL) for 30 mins before the addition of benzyl bromoacetate (0.21 mL, 1 .36mmol). The resultant mixture was heated to 60 C and left to stir at temperature overnight. The reaction was then quenched by addition of water (2OmL) and extracted with EtOAc (3 x 20 mL). The combined organic layers were dried over Na2SO4, filtered and concentrated in vacuo to give benzyl 2-(3-isopropylpyrazol-1-yl)acetate (200mg, 0.77mmol, 85%) which was used inthe next step without further purification.1H NMR (CDCI3,400MHZ) O/ppm: 7.41-7.33 (6H, m), 6.18 (1H, d, J= 2.3Hz), 5.21 (2H, 5), 4.96 (2H, 5), 3.04 (1H, sept, J= 7.0Hz), 1.31 (3H, 5), 1.29 (3H, 5).MS Method 2: RT: 1.87 mi mlz 259.0 [M+H]

According to the analysis of related databases, 49633-25-2, the application of this compound in the production field has become more and more popular.

Electric Literature of 1384973-12-9,Some common heterocyclic compound, 1384973-12-9, name is 5-Amino-3-bromo-1H-pyrazole-4-carbonitrile, molecular formula is C4H3BrN4, 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-3-bromo-lH-pyrazole-4-carbonitrile (500 mg, 2.67 mmol) in EtOH (5 mL)/H20 (5 mL) /toluene (5 mL) were added 3 -pyridine boronic acid (493 mg, 4.01 mmol), K3P04 (2.13 g, 8.02 mmol) and Pd(dppf)Cl2 (391 mg, 0.53 mmol) under N2. The resulting mixture was stirred at 110C for 64 hours under N2. After cooling to rt, the mixture was concentrated in vacuo, diluted with ethyl acetate, washed with water (10 mL x 3) and dried over MgS04. After filtration, the filtrate was concentrated in vacuo. The residue was purified by preparative-TLC to afford 300mg of the desired product: MS (m/z): 185.9 [M+H]+.

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-3-bromo-1H-pyrazole-4-carbonitrile, its application will become more common.

These common heterocyclic compound, 400877-57-8, name is Methyl 1-methyl-4-nitro-1H-pyrazole-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. SDS of cas: 400877-57-8

A solution of l-methyl-4-nitro-lH-pyrazole-3-carboxylic acid methyl ester (4.8 g, 25.94 mmol) in dry MeOH (100ml) was thoroughly purged with argon, treated with 10% Pd-C (2.7 g, 2.59 mmol), and again purged with argon. Then the reaction mixture was hydrogenated under a balloon pressure of hydrogen at rt for overnight. The reaction mixture was filtered through a bed of celite. The filtrate was concentrated and dried to give the title compound as gray-white solid (3.4 g, 84%), which was used in the next reaction step without further purification.

The synthetic route of Methyl 1-methyl-4-nitro-1H-pyrazole-3-carboxylate has been constantly updated, and we look forward to future research findings.

Adding a certain compound to certain chemical reactions, such as: 16034-48-3, name is 1-Pyrazoleacetic Acid, 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 16034-48-3, SDS of cas: 16034-48-3

To a solution of 1 .76 g of Pyrazol-1 -yl-acetic acid in 20 ml of dry DMF 2.09 g of HOAT, 3.75 g of EDC and 6.9 ml of DIPEA were added at 0C. After 30 min 3.3 g of 3-amino-4-(1 -ethyl-propylamino)-benzoic acid methyl ester were added and the reaction was stirred at rt for 16 h. The reaction was then poured into water and extracted with ethyl acetate three times. The combined organic phases were washed with saturated aqueous sodium bicarbonate solution and brine, dried over magnesium sulphate and concentrated. The crude product was purified by precipitation from heptane to yield 2.28 g (47 %) of 4-(1 -Ethyl-propylamino)-3-(2- pyrazol-1 -yl-acetylamino)-benzoic acid methyl ester. C 8H24N4O3 (344.42), LCMS (method 8_1_1 ): Rt = 0.85 min, m/z= 345.15 [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-Pyrazoleacetic Acid, other downstream synthetic routes, hurry up and to see.

Related Products of 6825-71-4, A common heterocyclic compound, 6825-71-4, name is Ethyl 3,5-diamino-1H-pyrazole-4-carboxylate, molecular formula is C6H10N4O2, 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 solution of sodium ethoxide in EtOH (0.49 N, 100 mL) were added ethyl 3,5- diamino-lH-pyrazole-4-carboxylate (2.08g, 0.012 mol), followed by solid 1,3-dimethyluracil (1.7 g, 0.012mol) and then the reaction mixture was stirred overnight at 90 C. The reaction mixture was cooled to r.t, filtered to give the title compound as a pink solid (2.1 g, 79%). NMR (300MHz, OMSO-de): delta (ppm) 11.30 (brs, 1H), 8.23 (d, J= 7.86 Hz, 1H), 5.93 (brs, 2H), 5.89 (d, J= 7.83 Hz, 1H), 4.26 (q, J= 7.08 Hz, 2H), 1.28 (t, J= 7.08 Hz, 3H).

The synthetic route of 6825-71-4 has been constantly updated, and we look forward to future research findings.

Application of 6314-23-4,Some common heterocyclic compound, 6314-23-4, name is 2-(1-Pyrazolyl)ethanol, molecular formula is C5H8N2O, 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: 30 g (0.2 mol) of phosphorus oxychloride was added to a mixture of 11.2 g of (0.1 mol) of 2-(1H-pyrazol-1-yl)ethanol I and 95.0 g (0.6 mol) of DMF upon stirring at 90C (maintaining the temperature below 120C). The reaction mixture was stirred during 1 hour at 100C, cooled, and neutralized with aqueous Na2CO3. The reaction product was extracted with chloroform and dried over magnesium sulfate. After removing the solvent, the residue was distilled in vacuum. Yield 9.7 g (75%), bp 47-48C (1 mmHg), nD20 1.5020, d420 1.1190 g/mL. IR spectrum, nu, cm-1: 1520 (ring). 1HNMR data coincided with that in [6].

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 2-(1-Pyrazolyl)ethanol, its application will become more common.

Related Products of 473528-88-0, 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. 473528-88-0, name is 4-Bromo-1-methyl-1H-pyrazole-5-carbaldehyde belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below.

A mixture of 4-bromo-l-methyl-lH-pyrazole-5-carbaldehyde (2.50 g, 13.2 mmol), bis- (pinacolato)diboron (5.04 g, 19.8 mmol), KOAc (3.89 g, 39.7 mmol) and PdCl2(dppf) (0.484 g, 0.661 mmol) in 1 ,4-dioxane (50 mL) was degassed and then heated at 80 C under N2 for 18 h, then was cooled to RT. The reaction mixture was diluted with EtOAc, then was filtered and concentrated in vacuo. The residue was chromatographed (80 g Si02; continuous gradient from 0% to 50% EtOAc in hexane over 20 min) to give the title compound (3.0 g, 12.7 mmol, 96 % yield) as a white solid. NMR (400 MHz, CDCls) d 10.27 (s, 1H), 7.78 (s, 1H), 4.19 (s, 3H), 1.34 (s, 12H); nB NMR (128 MHz, CDC13) d 29.2 (br s, IB).

The synthetic route of 4-Bromo-1-methyl-1H-pyrazole-5-carbaldehyde has been constantly updated, and we look forward to future research findings.

Related Products of 16617-46-2,Some common heterocyclic compound, 16617-46-2, name is 3-Amino-1H-pyrazole-4-carbonitrile, molecular formula is C4H4N4, 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.

Example 30; (R)-5-(2-(2,5-difluorophenyl)pyrrolidin-l-yl)pyrazolori,5-alpyrimidine-3-carboxamide; Step A: Preparation of 5-hydroxypyrazolo[l,5-alpyrimidine-3-carbonitrile.; To a mixture of 5-amino-lH-pyrazole-4-carbonitrile (2.70 g, 25.0 mmol) and CS2CO3 (16.3 g, 50.0 mmol) in dry DMF (70 mL) was added ethyl 3-ethoxyacrylate (5.41 g, 37.5 mmol) and the mixture was heated at 100 0C for 4 hours. The mixture was cooled to ambient temperature and the resultant slurry was poured into deionized H2O (150 mL). The resulting aqueous solution was cooled on an ice bath and concentrated HCl was added slowly with mixing to pH = 3.5. The resulting precipitate was collected, washed with H2O followed by Et2O. The solid was dried in vacuum to afford the product as a light beige powder (3.87 g, 97percent). MS (apci) m/z = 159.0 (M-I).

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