Category: pyrazoles-derivatives

Related Products of 5334-40-7, The chemical industry reduces the impact on the environment during synthesis 5334-40-7, name is 4-Nitro-1H-pyrazole-3-carboxylic acid, I believe this compound will play a more active role in future production and life.

A stirred solution of S-83 (1.00 g, 6.36 mmol) in THF (10 mL) taken in a round- bottom flask was charged with Et3N (1.3 mL, 9.55 mmol) and DPPA (2.62 g, 9.55 mmol) at room temperature. The reaction mixture was stirred for 6 h at room temperature under nitrogen atmosphere. At this time, t-butanol (10 mL) was added and refluxed for 6 h under nitrogen atmosphere. When TLC showed complete consumption of starting material, the reaction mixture was diluted with the water (10 mL) and extracted with EtOAc (2 ¡Á 10 mL). The combined organic layers were washed with water (10 mL). The organic layers were dried over anhydrous Na2SO4, and concentrated under reduced pressure. The crude product was purified by column chromatography on silica gel using 0? 50percent EtOAc in hexanes as eluent to afford S-91 (0.20 g, 14percent, AMRI lot IN-SKY-C-110) as an off-white solid. The compound was characterized by UPLC analysis. MS-UPLC (MM) m/z 127.2 [M? ]-

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

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. 105486-72-4, name is Ethyl 5-bromo-1-methyl-1H-pyrazole-4-carboxylate, This compound has unique chemical properties. The synthetic route is as follows., Quality Control of Ethyl 5-bromo-1-methyl-1H-pyrazole-4-carboxylate

4.1.6 1-Methyl-5-(pent-4-en-1-yloxy)-1H-pyrazole-4-carboxylic acid 10b A solution of pent-4-en-1-ol (1.45?mL, 14.0?mmol) in THF (24.0?mL) was cooled to -8?C and treated with 1.0?M sodium hexamethyldisilazane in THF (14.0?mL, 14.0?mmol). The reaction mixture was stirred at the reduced temperature for 5?min before the ice bath was removed. Stirring was continued for an additional 25?min before being treated with a solution of ethyl 5-bromo-1-methyl-1H-pyrazole-4-carboxylate (1.1?g, 4.7?mmol) in THF (24?mL). The reaction mixture was stirred for 1 hour at room temperature before being quenched with 50?mL of sat. NH4Cl. The crude product was extracted with DCM (60?mL x 3), dried with Na2SO4 and concentrated under reduced pressure. This material purified by SiO2 chromatography (ethyl acetate: petroleum ether?=?1:5) to afford 0.65?g impure product 9b mixed with pent-4-en-1-yl 1-methyl-5-(pent-4-en-1-yloxy)-1H-pyrazole-4-carboxylate (produced through transesterification reaction), the mixed esters could both be the raw materials for next hydrolysis, so the mixture was put into next step without further separation. To a solution of the mixed esters in 5?mL MeOH/THF (VMeOH:VTHF?=?1:1) at 0? was added 5?mL 2M NaOH (aq). The mixture was stirred at room temperature for 3?h and MeOH and THF were evaporated in vacuo. The residue was acidified to pH?=?2-3 with 1?N HCl and extracted with ethyl acetate (10?mL?*?3). The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure to afford compound 10b as yellow solid (0.45?g, 46%). 1 H NMR (500?MHz, CDCl3) delta 7.84 (s, 1H), 5.89-5.77 (m, 1H), 5.10-5.00 (m, 2H), 4.46 (t, J?=?6.5?Hz, 2H), 3.70 (s, 4H), 2.28-2.19 (m, 2H), 1.93-1.85 (m, 2H); ESI-MS: m/z?=?209 [M-H]-.

According to the analysis of related databases, 105486-72-4, the application of this compound in the production field has become more and more popular.

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 5334-40-7 as follows. SDS of cas: 5334-40-7

Reference Example 1 Methyl 4-nitro-1H-pyrazole-3-carboxylate Acetyl chloride (9 mL) was added dropwise to methanol (90 mL), 4-nitro-1H-pyrazole-3-carboxylic acid (9.00 g, 57.3 mmol) was added to the mixture. The mixture was stirred at room temperature for 16 hr, and concentrated under reduced pressure. Methanol was added to the residue, and the mixture was concentrated under reduced pressure, the operation was twice repeated. The residue was diluted with methanol and ethyl acetate. 5% sodium hydrogencarbonate aqueous solution was added, and the pH was adjusted to 8-9. The mixture was extracted with ethyl acetate. The extract was washed with water, brine, dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure to give the title compound (9.83 g, yield 100%). 1H-NMR (DMSO-d6, 200 MHz): delta 3.98 (3H, s), 8.28 (1H, s).

According to the analysis of related databases, 5334-40-7, the application of this compound in the production field has become more and more popular.

Reference of 943541-20-6,Some common heterocyclic compound, 943541-20-6, name is 3-Chloro-6-(1-methyl-1H-pyrazol-4-yl)pyridazine, molecular formula is C8H7ClN4, 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 13: A route to prepare compound (I)6-{difluoror6-(1-methvl-1 H-pvrazol-4-vl)? ,2,41triazolor4,3-lpvridazin-3-vnmethvl>quinolineStep 1 : tert-butyl 2-f6-(1-methyl-1 H-pyrazol-4-yl)pyridazin-3-vnhvdrazinecarboxylatetert-butyl carbazate, 8,98g (67,3 mmol) and 3-chloro-6-(1-methyl-1 /-/-pyrazol-4- yl)pyridazine (11 ,9 g, 61 ,1 mmol) were mixed in 1-butanol (245 ml_). This mixture was heated till 900C and stirred at that temperature for 16h. The reaction mixture was cooled and water (250 ml_) and ethylacetate (250 mL) were added. The biphasic mixture was neutralised with sodium hydrogencarbonate till the pH is 7. Then the organic layer was separated and the water layer was extracted with ethylacetate (250 mL). The combined organic layers were washed once with water (250 mL) and evaporated. The residue was stirred in isopropylether, filtered off and dried under vacuum. Yield: 5,9 g (20,3 mmol; 33%) of the title compound.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 3-Chloro-6-(1-methyl-1H-pyrazol-4-yl)pyridazine, its application will become more common.

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. 35344-95-7, name is 1H-Pyrazole-4-carbaldehyde, This compound has unique chemical properties. The synthetic route is as follows., Recommanded Product: 1H-Pyrazole-4-carbaldehyde

Sodium hydride (60percent, 6.3 g, 1.0 eq) was added to a solution of 1H-pyrazole-4-carbaldehyde (15 g, 156 mmol) in DMF (150 ml) at 0¡ã C. The mixture was allowed to warm and was stirred at room temperature. (2-Bromoethoxy)benzene (30.2 g, 1 eq) was then added and the resulting mixture was stirred overnight at room temperature. It was quenched by addition of aqueous ammonium chloride, diluted with water and extracted with EtOAc. The combined organic layers were dried over Na2SO4, filtered, and concentrated. The residue was purified by column chromatography using a hexane/ EtOAc gradient (10:1 to 0:100). Pure fractions were combined and evaporated under reduced pressure to yield 1-(2-phenoxyethyl)-1H-pyrazole-4-carbaldehyde (24 g, 71percent).

According to the analysis of related databases, 35344-95-7, the application of this compound in the production field has become more and more popular.

Application of 35100-92-6,Some common heterocyclic compound, 35100-92-6, name is 1,5-Dimethyl-1H-pyrazol-3-amine, molecular formula is C5H9N3, 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.

The final product 03 (30 mg, 0.0927 mmol), 1,5-dimethyl-1H-pyrazole-3-amine (31 mg, 0.278 mmol) and Et3N (38 mg, 0.376 mmol) were weighed into a bottle, and 2 mL of DMF was added to dissolve Reaction reagent.The reaction was heated at 50 C overnight.The crude reaction product was directly purified by reverse-phase HPLC to obtain the target compound YB152 (54.7 mg).

The synthetic route of 35100-92-6 has been constantly updated, and we look forward to future research findings.

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. 15953-45-4, name is 5-Chloro-3-methyl-1H-pyrazole, This compound has unique chemical properties. The synthetic route is as follows., COA of Formula: C4H5ClN2

(b) S-Chloropyrazole-S-carboxylic acidA mixture of 5-chloro-3-methylpyrazole (3.6 mmol; see step (a) above), water (6 mL) and fert-butanol (1.2 mL) was heated to 750C, after which KMnO4 (1.42 g, 9 mmol) was added. The mixture was stirred at 75 C 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 NaCl (sat., aq.), dried (MgSO4) and concentrated. The crude solid was recrystallised from EPO 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, IH), 6.80 (s, IH)

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 15953-45-4.

Related Products of 1353100-91-0,Some common heterocyclic compound, 1353100-91-0, name is Ethyl 3-bromo-1H-pyrazole-4-carboxylate, molecular formula is C6H7BrN2O2, 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.

[0500] to a solution of NAH (1.64 g, 41.09 mmol, 60% purity) in THF (80 ml) at 0 C was added a solution of compound 30b (6 g, 27.39 mmol) in THF (20 ml). After addition, the mixture was warmed up to 25 C and stirred for 2 hrs. Then the solution was cooled to 0 C and a solution of sem-c1 (5.34 ml, 30.13 mmol) in THF (100 ml) was added at 0 C. The mixture was then warmed up to 25 C and stirred for 12 hrs. The reaction was quenched with H2O (100 ml) dropwise. The mixture was extracted with EtOAc (100 ml x 2). The organics were collected and concentrated. The residue was purified by column (petroleum ether: ethyl acetate = 10: 1) to afford compound 30c (3 g, yield: 31.14%) as yellow oil.

The synthetic route of 1353100-91-0 has been constantly updated, and we look forward to future research findings.

Related Products of 35344-95-7, 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. 35344-95-7, name is 1H-Pyrazole-4-carbaldehyde, This compound has unique chemical properties. The synthetic route is as follows.

Preparation of (lR, 4R)-N1-((lH-prazol-4-l)methl)-N4-(4-(5- (cvclopropylmethyl)-l-methyl-lH-pyrazol-4-yl)pyrimidin-2-yl)cvclohexane-l,4- diamine (A80) To a solution of A-14 (200.00 mg, 612.67 mupiiotaomicron, 1.00 eq) and lH-pyrazole-4- carbaldehyde (58.87 mg, 612.67 muetaiotaomicron, 1.00 eq) were added AcOH (36.79 mg, 612.67 02429524H5-01 muetaiotaomicron, 35.04 uL, 1.00 eq) and NaBH3CN (77.00 mg, 1.23 mmol, 2.00 eq). The mixture was sitrred at 15 ¡ãC for 16 hours. The mixture was quenched with aqueous NaHCCb (1 mL) and concentrated. The residue was purified by prep-HPLC (basic condition) to give A-80 (20.00 mg, 48.90 muiotaetaomicron, 8percent yield, 99.4percent purity) as a yellow solid. LCMS: RT = 2.418 min, m/z 407.2 [M+H]+ NMR (CDCb, 400 MHz) delta 8.17 (d, /=5.2Hz, IH), 7.83 (s, IH), 7.58 (s, IH), 6.71 (d, /=6.2Hz, IH), 4.88 (d, /=7.6Hz, IH), 3.89 (s, 4H), 3.81 (s, 2H), 3.21 (d, /=6.0Hz, 2H), 2.61 (s, IH), 2.21-2.03 (m, 4H), 1.36-1.25 (m, 4H), 1.09 (s, IH), 0.48-0.46 (m, 2H), 0.25-0.24 (m, 2H).

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

Electric Literature of 1192-21-8, 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. 1192-21-8, name is 1-Methyl-1H-pyrazol-5-amine, This compound has unique chemical properties. The synthetic route is as follows.

Step 1: A clean 100 L cylindrical reaction vessel was charged with THF (13 kg) then (S)-1-(2-((tert-butyldimethylsilyl)oxy)-1-(4-chloro-3-fluorophenyl)ethyl)-4-(2-(methylsulfonyl)pyrimidin-4-yl)pyridin-2(1H)-one (I, 5 kg) and 1-methyl-1H-pyrazol-5-amine (1.1 kg) were added sequentially with medium agitation followed by THF (18 kg). The mixture was cooled to ?35¡ã C. and to the resulting thin slurry was added slowly a THF solution of LiHMDS (17.4 kg, 1.0 M) at a rate that maintained the internal temperature below ?25¡ã C. After the addition was completed, the reaction was held between ?35 and ?25¡ã C. for 20 min and monitored by HPLC. If the HPLC result indicated ?98.5percent conversion, additional LiHMDS (0.34 kg, 1.0 M, 0.05 mol percent) was added slowly at ?35¡ã C. The reaction was quenched slowly at the same temperature with H3PO4 solution (4.4 kg of 85percent H3PO4 and 15 kg of water) and the internal temperature was kept below 30¡ã C. The reaction was diluted with EtOAc (18 kg) and the phases separated, the organic layer was washed with H3PO4 solution (1.1 kg of 85percent H3PO4 and 12 kg of water) followed by a second H3PO4wash (0.55 kg of 85percent H3PO4 and 12 kg of water). If 1-methyl-1H-pyrazol-5-remained, the organic layer was washed again with H3PO4 solution (0.55 kg of 85percent H3PO4 and 12 kg of water). Finally the organic layer was washed sequentially with water (20 kg) and a NaCl and NaHCO3 solution (2 kg of NaCl, 0.35 kg of NaHCO3 and 10 kg of water). After the phase separation, residue water in organic solution was removed through an azeotropic distillation with EtOAc to <0.5percent (by KF) and then solution was concentrated to 20-30 L under a vacuum below 50¡ã C. The solvent was then swapped to MeOH using 35 kg of MeOH and then concentrated to between 20 and 30 L for the next step. The chemical industry reduces the impact on the environment during synthesis 1-Methyl-1H-pyrazol-5-amine. I believe this compound will play a more active role in future production and life.