Tag: M.W:100-200

Reference of 4149-06-8, 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. 4149-06-8 name is 3-Amino-1-phenyl-1H-pyrazol-5(4H)-one, 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.

A solution of 3-amino-1-phenyl-2-pyrazolin-5-one 1 (0.35 g, 2 mmol), dimedone 2 (0.28 g, 2 mmol), aldehyde 3 (0.28 mg, 2 mmol) and Cell-LA-TEA+/Fe3O4 nanocatalyst (0.03 g, 0.09 mol%) in H2O/EtOH (3:2) was subjected to ultrasonic irradiation (ultrasonic bath, room temperature). The progress of the reaction was controlled by TLC (hexane/ethyl acetate, 2:3). After reaction completion, the nanocatalyst was separated magnetically from the reaction mixture and used for subsequent cycles after washing with ethanol. By cooling the reaction solution, the solid product was collected, separated and recrystallized from methanol to get the pure product.

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 3-Amino-1-phenyl-1H-pyrazol-5(4H)-one, and friends who are interested can also refer to it.

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. 2075-45-8, name is 4-Bromo-1H-pyrazole, This compound has unique chemical properties. The synthetic route is as follows., Safety of 4-Bromo-1H-pyrazole

Step A: 4-Bromo-1-cyclopropyl-1H-pyrazole 4-Bromo-1H-pyrazole (1.76 g, 12 mmol) is dissolved in anhydrous dimethylformamide (15 mL). Cyclopropyl bromide (2.9 mL, 36 mmol) and caesium carbonate (7.8 g, 24 mmol) are successively added thereto. The reaction mixture is heated for 15 hours at 160 C. in a sealed flask. At the end of the reaction, the solvent is evaporated off in vacuo and the residue is purified by chromatography over silica gel using heptane and dichloromethane as eluants to yield the expected compound.

According to the analysis of related databases, 2075-45-8, the application of this compound in the production field has become more and more popular.

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. 151049-87-5, name is 3-Bromo-1-methyl-1H-pyrazole, A new synthetic method of this compound is introduced below., Computed Properties of C4H5BrN2

Example 0734 0734-1 A mixture of 5-bromo-2-methylpyridine (258 mg), bis(pinacolato)diboron (396 mg), potassium acetate (282 mg), (1,1′-bis(diphenylphosphino)ferrocene)palladium(II) dichloride-dichloromethane adduct (49 mg), and 1,4-dioxane (5 mL) was stirred at 100 C. for 2.5 hours. 3-Bromo-1-methyl-1H-pyrazole (200 mg), sodium carbonate (254 mg), bis(di-tert-butyl(4-dimethylaminophenyl)phosphine)dichloropalladium(II) (42 mg), and water (0.5 mL) were added thereto, followed by stirring at 100 C. for 6 hours. The reaction mixture was cooled to room temperature, the solvent was distilled off under reduced pressure, and the obtained residue was purified by silica gel column chromatography (hexane-ethyl acetate, NH silica), thereby obtaining 2-methyl-5-(1-methyl-1H-pyrazol-3-yl)pyridine (190 mg) as yellow oily substance. MS m/z (M+H): 174.

The synthetic route of 151049-87-5 has been constantly updated, and we look forward to future research findings.

Adding a certain compound to certain chemical reactions, such as: 578008-32-9, name is tert-Butyl 3-amino-5-methyl-1H-pyrazole-1-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 578008-32-9, HPLC of Formula: C9H15N3O2

A reaction vessel was charged with 6-chloro-N-[(l¡ê)-l-(5-fluoropyrimidm-2-yl)emyl]pyrazm-2- amine (Intermediate 9, 118 mg, 0.47 mmol), tert-butyl 3-amino-5-methyl-lH-pyrazole-l- carboxylate (Intermediate 10, 103 mg, 0.52 mmol), Cs2CO3 (459 mg, 1.14 mmol), Xantphos (14 mg, 0.024 mmol) and Pd2(dba)3 (7 mg, 0.012 mmol) and purged with nitrogen for 10 minutes. Dioxane (0.15 M) was then added to the tube and the reaction mixture was purged with nitrogen for another 10 minutes. The reaction mixture was heated at 1000C overnight. The reaction mixture was filtered through a plug of diatomaceous earth, diluted with EtOAc, washed with nuaetaCO3(aq) and brine, and dried (Na2SO4). The solvent was removed in vacuo to give a yellow residue (181 mg), which was purified with a Gilson column (10-35% MeCN/H2O, 15 min). The title compound was collected as a yellow solid (18.9 mg). LCMS: [M+H]+ 315. 1H NMR (300 MHz5 DMSO-d6) delta: 9.69 (s, 1 H) 8.94 (s, 2 H) 7.77 (br.s, 1 H) 7.53 (s, 1 H) 7.43 (s, 1 H) 6.03 (s, 1 H) 5.68 (s, 1 H) 5.24 (m, 1 H) 2.27 (s, 3 H) 1.60 (d, 3 H).

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.

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. 20154-03-4, name is 3-(Trifluoromethyl)-1H-pyrazole, This compound has unique chemical properties. The synthetic route is as follows., category: pyrazoles-derivatives

Step c: NaH (33.08 g (19.85, 60percent), 1.5 eq) was washed with hexane, dry DMF (500 ml) was added drop wise under N2 atmosphere and stirred well. A solution of 3-(trifluoromethyl)- 1 H-pyrazole (75 g, 550 mmol) in DMF (125 ml) was added drop wise under N2 atmosphere. Then a solution of 4-methoxylbenzyl chloride (86.3 g, 550 mmol, 1 eq) in DMF (125 ml) was added drop wise and the overall reaction mixture was allowed to stir for 12 h at room temperature. On completion of the reaction, reaction contents were poured into ice water (500 ml) and the product was extracted with ethyl acetate (2 * 400 ml). The ethyl acetate layer was washed with 2N HCI (2x200ml). Then the contents were dried over sodium sulfate and concentrated under reduced pressure. Obtained crude was purified by silica gel column chromatography with 10percent ethyl acetate/Hexane to yield the required product as a brown colored liquid (98 g, 70percent yield).

According to the analysis of related databases, 20154-03-4, the application of this compound in the production field has become more and more popular.

Reference of 2075-46-9, These common heterocyclic compound, 2075-46-9, name is 4-Nitro-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.

Step 1: Preparation of 3-chloro-1H-pyrazol-4-amine hydrochloride Into a 2 L three-necked round bottom flask affixed with an overhead stirrer, a temperature probe, an addition funnel, and a nitrogen inlet were added ethanol (600 mL) and 4-nitro-1H-pyrazole (50.6 g, 447 mmol). To this solution was added, in one portion, conc. HCl (368 mL) (note: rapid exotherm from 15 C. to 39 C.) and the resulting mixture was purged with nitrogen for 5 minutes. Palladium on alumina (5% w/w) (2.6 g, Alfa, black solid) was added to the mixture and stirred at room temperature while triethylsilane (208 g, 1789 mmol) was added drop-wise over 4 h. The reaction, which started to slowly exotherm from 35 C. to 55 C. over 2.0 h, was stirred for a total of 16 h and vacuum filtered through a plug of Celite to give a biphasic mixture. The mixture was transferred to a separatory funnel, the bottom aqueous layer was collected and rotary evaporated (60 C., 50 mmHg) to dryness with the aid of acetonitrile (3*350 mL). The resulting yellow solid was suspended in acetonitrile (150 mL) and allowed to stand for 2 h at room temperature followed by 1 h at 0 C. in the refrigerator. The solids were filtered and washed with acetonitrile (100 mL) to afford the titled compound 3-chloro-1H-pyrazol-4-amine hydrochloride (84 g, 97% yield, 80% purity) as a white solid: mp 190-193 C.; 1H NMR (400 MHz, DMSO-d6) delta 10.46-10.24 (bs, 2H), 8.03 (s, 0.54H), 7.75 (s, 0.46H), 5.95 (bs, 1H)); 13C-NMR (101 MHz, DMSO) delta 128.24, 125.97, 116.71.

Statistics shows that 4-Nitro-1H-pyrazole is playing an increasingly important role. we look forward to future research findings about 2075-46-9.

Synthetic Route of 27258-33-9,Some common heterocyclic compound, 27258-33-9, name is 1-Methyl-1H-pyrazole-5-carbaldehyde, molecular formula is C5H6N2O, 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 4; Influence of the ligand Using the optimal conditions [Example 2] which leads to 85-87% ee with the ligand sd499, a ligand screening with a variety of N,O-ligands was carried out. The results are given in the following table. The best results were obtained with the ligands sd311b (91% ee) and commercially available (S)-2-piperidinyl-1,1,2-triphenylethanol at 5 mol% scale. As the latter one is known to be a somewhat slower ligand than the paracyclophane-based ligands and the derivatives of sd499, we repeated the experiment with 10 mol% of (S)-2-piperidinyl-1,1,2-triphenylethanol. This experiment gave 93% ee. The ligand is available in both enantiomeric forms.

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

Reference of 1018446-95-1, 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. 1018446-95-1 name is tert-Butyl 4-amino-1H-pyrazole-1-carboxylate, 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.

(1) tert-butyl 4-[({4-[(2-chlorophenoxy)methyl]pyridin-2-yl}carbonyl)amino]-1H-pyrazole-1-carboxylate To a solution of 4-[(2-chlorophenoxy)methyl]pyridine-2-carboxylic acid (2.64 g) obtained in Example 119(2) in tetrahydrofuran (50 mL) was added oxalyl chloride (1 mL) at room temperature, and then N,N-dimethylformamide (1 drop) was added. The mixture was stirred at room temperature for 40 min and tetrahydrofuran was evaporated under reduced pressure. The residue was dissolved in N,N-dimethylacetamide (50 mL). This solution was added dropwise to a solution of tert-butyl 4-amino-1H-pyrazole-1-carboxylate (2.01 g) synthesised in the above-mentioned (1a) in N,N-dimethylacetamide (50 mL), which was placed in advance in a different pear shape flask. The mixture was stirred at room temperature for 3 hr. Water was added, and the precipitated solid was collected by filtration and washed with water and hexane to give a gray solid (3.73 g, 87%). 1H NMR (300 MHz, DMSO-d6) delta ppm 1.60 (s, 9H) 5.45 (s, 2H) 6.97-7.06 (m, 1H) 7.19-7.25 (m, 1H) 7.28-7.37 (m, 1H) 7.50 (dd, J=1.51, 7.91 Hz, 1H) 7.73 (dd, J=1.60, 4.99 Hz, 1H) 8.15 (s, 1H) 8.24 (d, J=0.75 Hz, 1H) 8.58 (s, 1H) 8.77 (d, J=4.90 Hz, 1H) 11.28 (s, 1H)

At the same time, in my other blogs, there are other synthetic methods of this type of compound, tert-Butyl 4-amino-1H-pyrazole-1-carboxylate, and friends who are interested can also refer to it.

These common heterocyclic compound, 175137-46-9, name is 5-Cyclopropyl-1H-pyrazol-3-amine, 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. Safety of 5-Cyclopropyl-1H-pyrazol-3-amine

To a mixture of 110a (2.38 g, 7.00 mmol), 5-cyclopropyl-lH-pyrazol-3-amine (905 mg, 7.35 mmol), in 1,4-dioxane (40 mL) in a 100 mL single-neck round-bottomed flask was added cesium carbonate (6.84 g, 21.0 mmol). The mixture was purged with nitrogen for 30min. Tris(dibenzylideneacetone)dipalladium(0) (641 mg, 0.700 mmol) and 4,5- bis(diphenylphosphino)-9,9-dimethylxanthene (688 mg, 1.19 mmol) were then added. The flask was connected to a nitrogen-purged condenser and the mixture was refluxed for 6 h under nitrogen. The mixture was cooled to room temperature and filtered. The filter cake was suspended in ethyl acetate (30 mL) and water (10 mL) and filtered through Celite. The layers were separated. The combined organic layers were dried with anhydrous magnesium sulfate. The drying agent was removed by filtration. The filtrate was concentrated under reduced pressure. The residue was purified on silica eluted with a gradient 0 to 50% ethyl acetate in heptane to afford 6-chloro-4-(5-cyclopropyl-lH-pyrazol-3-ylamino)-2-((2- (trimethylsilyl)ethoxy)methyl)pyridazin-3(2H)-one (111a) (1.58 g, 59%).

The synthetic route of 5-Cyclopropyl-1H-pyrazol-3-amine has been constantly updated, and we look forward to future research findings.

Related Products of 57012-20-1, 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. 57012-20-1, name is (1,3-Dimethyl-1H-pyrazol-5-yl)methanol, This compound has unique chemical properties. The synthetic route is as follows.

Step 2: Preparation of 2,5-dimethyl-2H-pyrazole-3-carbaldehyde (15) A mixture of compound 14 (3 grams, 23.8 mmol) and pyridinium dichromate (13.4 grams, 35.7 mmol) in dichloromethane (100 mL) was stirred at 25 C. under nitrogen atmosphere for 16 hours. The reaction mixture was then filtered. The filtrate was collected, dried over anhydrous Na2SO4 and concentrated under reduced pressure. The crude thus obtained was passed through the silica gel to afford the desired compound 2,5-dimethyl-2H-pyrazole-3-carbaldehyde (15) 1 gram as a brown solid. Yield: 34%; 1H NMR (200 MHz, CDCl3): delta 9.8 (s, H), 6.6(s, H), 4.1 (s, 3H), 2.3 (s, 3H). Mass (CI method, i-butane): 125 (M+1, 100%); IR: numax (KBr, cm-1): 1688.

The chemical industry reduces the impact on the environment during synthesis (1,3-Dimethyl-1H-pyrazol-5-yl)methanol. I believe this compound will play a more active role in future production and life.