Tag: M.W:100-200

Adding some certain compound to certain chemical reactions, such as: 3469-69-0, name is 4-Iodopyrazole, 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 3469-69-0. 3469-69-0

To a stirred solution of 4-iodopyrazole (5.0 g, 25.8 mmol) in dichloromethane (10 mL) was added TsOH H2O (0.5 g, 2.9 mmol) and 3,4-dihydro-2h-pyran (4.5 g, 53.5 mmol). The resulting mixture was stirred at room temperature for 2 h. The reaction mixture was concentrated in vacuo. The residue was purified by silica gel column eluted ethyl acetate/petroleum ether (1:3) to afford desired product 4-iodo-1-tetrahydropyran-2-yl-pyrazole (7 g, 93% yield) as a colorless oil. LCMS (ESI): [M-84+H]+=195.1.

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 4-Iodopyrazole.

5334-43-0, 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. 5334-43-0, name is 5-Amino-1-phenyl-1H-pyrazole-4-carbonitrile, A new synthetic method of this compound is introduced below.

General procedure: Equimolar portionsof the intermediate compounds 1 (1 mmol) and the intermediatecompounds 3 (1 mmol) were dissolved in approximately 8 mL ofethanol. The reaction solution was allowed to stir at 80 8C for 2 huntil the reaction was complete. The reaction was monitored byTLC. Mostly, a precipitate formed and was then collected by suctionfiltration.

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.

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. 402-61-9, name is 5-Methyl-1H-pyrazole-3-carboxylic acid, A new synthetic method of this compound is introduced below., 402-61-9

To 4 g (30 mmoles) of 5-methyl pyrazole 3-carboxylic acid are added 7.1 g (60 mmoles) of thionyl chloride, 150 ml of toluene and several drops of DMF. To the product obtained are then added 7.7 g of 2,6-dimethyl aniline (60 mmoles), 200 ml of toluene and again a few drops of DMF. 2.60 of the title product are obtained in the form of ochre crystals. Yield: 37.8% M.p. 190 C.

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.

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 27258-33-9 as follows. 27258-33-9

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.

According to the analysis of related databases, 27258-33-9, the application of this compound in the production field has become more and more popular.

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. 26621-44-3, name is 3-Nitro-1H-pyrazole belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below. 26621-44-3

General procedure: 3-methoxy-1H-pyrazole 14f (0.15 g, 1.53 mmol) was dissolved in dry pyridine (15 mL) and DMAP (0.02 g, 1.15 mmol) was added, followed by hexyl isocyanate (0.33 mL, 2.3 mmol). The resulting solution was stirred under nitrogen atmosphere at rt for 12 h. The solvent was evaporated under reduced pressure and the two regioisomers 23f and 24f were obtained in a ratio of 92:8, determined by 1H NMR of the crude. The mixture was separated by silica gel column chromatography using cyclohexane/EtOAc. 23f eluted with cyclohexane/EtOAc 99.5:0.5 and 24f eluted with cyclohexane/EtOAc 90:10.

The synthetic route of 26621-44-3 has been constantly updated, and we look forward to future research findings.

2458-26-6,Some common heterocyclic compound, 2458-26-6, name is 3-Phenyl-1H-pyrazole, molecular formula is C9H8N2, 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: To a 25 mL of Schlenk tube equipped with a Teflon septum were added Imidazoles/Pyrazoles (0.4 mmol, 1.0 equiv) and KF (46.4 mg, 2.0 equiv) under Ar, followed by MeCN (3 mL) with stirring. 2 (0.40 mmol, 1.0 equiv) were added subsequently. After stirring for 12 h, the reaction mixture was concentrated. The residue was purified with silica gel chromatography to provide pure product.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 2458-26-6, its application will become more common.

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. 82560-12-1 name is 3-Amino-5-tert-butylpyrazole, 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. 82560-12-1

3-(Tert-butyl)-lH-pyrazol-5-amine (0.32 g, 2.30 mmol) was treated with a solution of Intermediate 61b (1.04 g, 2.60 mmol) in toluene (4 mL) then potassium carbonate (0.68 g, 4.90 mmol), (IS, 2S)-N,N’-bis-methyl-l,2-cyclohexane-diamine (0.07 g, 0.47 mmol) and copper (I) iodide (0.022 g, 0.11 mmol) were added. The mixture was degassed then heated at 150 C for 1 h using microwave irradiation. Another portion of copper (I) iodide (0.022 g, 0.11 mmol) was added and the reaction mixture heated at 150 C for a further 1 h using microwave irradiation. The mixture was diluted with EtOAc and water and the phases separated. The aqueous layer was then extracted with EtOAc (2 x ). The combined organic layers were washed with brine, dried (Na2S04), filtered and evaporated in vacuo. The organic layer was evaporated in vacuo. The residue was purified by FCC, using 0-15% EtOAc in DCM, to give the title compound (0.14 g, 15%). LCMS (Method 3): Rt 3.87 min, m/z 418 [MH+].

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 3-Amino-5-tert-butylpyrazole, 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. 139755-99-0, name is 1-Methyl-3-propyl-1H-pyrazole-5-carboxylic acid, This compound has unique chemical properties. The synthetic route is as follows., 139755-99-0

To a solution of I-04a (9.5 g, 56.54 mmol) was dissolved in conc. H2S04 (40 mL). Then conc. H2S04:H NO3 (3.6 mL:8 mL) was added into the reactionmixture slowly, and stirred at 50 00 overnight. The reaction mixture was poured into ice-water and filtered, the filtrate cake was collected and concentrated under vacuo to give I-05a (8 g, 71 .11% yield). ESI-MS (Mi-i):214 calc. for C9H11N304: 213.1

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.

3469-69-0, Adding a certain compound to certain chemical reactions, such as: 3469-69-0, name is 4-Iodopyrazole, 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 3469-69-0.

4-iodo-lH-pyrazole (5.03 g, 25.92 mmol, 1.0 eq) was dissolved in dry THF (40 mL), NaH (4.16 g, 60%, 4.0 eq) was added in portions. T he resulting mixture was stirred at rt for 30 min. To this mixture was added (2- (chloromethoxy)ethyl)trimethylsilane (6.47 g, 38.89 mmol, 1.5 eq) dropwise. The reaction was stirred at ambient temperature for 2 h, then poured into saturated aqueous NH4CI. The mixture was extracted with EA, washed with water, brine, dried over anhydrous sodium sulfate, and purified on silica gel column to afford desired 4-iodo-l -((2-(trimethylsilyl)ethoxy)methyl)-lH-pyrazole (7.5 g, 89%).

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-Iodopyrazole, other downstream synthetic routes, hurry up and to see.

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. 2075-46-9 name is 4-Nitro-1H-pyrazole, 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. 2075-46-9

Step 1 To a solution of 4-nitro-lH-pyrazole (100 g, 0.88 mol) in ACN (2L) was added K2C03 (183.2 g, 1.33 mol) and methyl 2-chloroacetate (95.6 g, 0.88 mol). The mixture was warmed to 60C and stirred for 5h. The mixture was then filtered and solvent removed to give methyl 2-(4- nitro-lH-pyrazol-l-yl)acetate as a white solid (150 g, 92%). 1H NMR (400 MHz CDC13): delta 8.28 (s, 1H), 8.11 (s, 1H), 4.98 (s, 2H), 3.84 (s, 3H),

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