Tag: M.W=0-100

Related Products of 28466-26-4, 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. 28466-26-4 name is 4-Aminopyrazole, 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.

General procedure: A mixture of the appropriate aminopyrazole 1 (0.01 mol), NaN3 (0.78 g, 0.012 mol), andtriethyl orthoformate (1.60 ml, 0.015 mol) or triethylorthoacetate (1.74 ml, 0.015 mol) in glacial acetic acid(10 ml) was stirred for 3-4 h at 90. The reaction mixturewas cooled and poured into ice water (50 ml). In the case ofcompounds 2a-c, 4b, the precipitate that formed wasfiltered off, washed with water, and recrystallized from EtOH. In the case of compounds 2d, 3a, 4a,c, the aqueouslayer was extracted with ethyl acetate (3¡Á15 ml), and theorganic layer was dried over anhydrous Na2SO4. Thesolvent was removed at reduced pressure, and the solidresidue was recrystallized from EtOH.

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

Some common heterocyclic compound, 28491-52-3, name is 5-Amino-1H-pyrazol-3(2H)-one, molecular formula is C3H5N3O, 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 C3H5N3O

A. 1,2,4,7-Tetrahydro-5-methyl-7-(3-nitro-phenyl)-2-oxopyrazolo[1,5,-a]pyrimidine-6carboxylic acid, 1-methylethyl ester A mixture of 3-amino-5-pyrazolone (3.57 g, 36.1 mmole) and 2-[(3-nitrophenyl)methylene]-3-oxobutanoic acid, 1-methylethyl ester (10 g, 36.1 mmole) in dry dimethylformamide (30 ml) was heated at 70 C. under argon for 24 hours. The reaction mixture was allowed to cool to room temperature and then diluted with ether. The resultant precipitate was filtered off and recrystallized from isopropanol to provide 4.23 g of the title A compound in crystalline form, m.p. 254-256 C. Analysis calc’d for C17 H18 N4 O5: C, 56.98; H, 5.06; N, 15.63; Found: C, 57.18; H, 5.10; N, 15.70.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 28491-52-3, its application will become more common.

Reference of 35344-95-7, 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. 35344-95-7 name is 1H-Pyrazole-4-carbaldehyde, 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.

To a 50-mL round-bottom flask was placed a solution of [(ls,3 s)-3 -(3-phenyl- 1 ,2-oxazole-5 -amido)cyclobutyljmethyl 4-methylbenzene- 1 -sulfonate (1g, 2.34 mmol, 1.00 equiv) in DMF (15 mL) then Cs2CO3 (1.5 g, 4.60 mmol, 2.00 equiv) and1H-pyrazole-4-carbaldehyde (338 mg, 3.52 mmol, 1.50 equiv) were added. The resulting solution was stirred for 3 h at 100¡ãC then the solids were removed by filtration. The crude product was purified by Flash-Prep-HPLC (CombiFlash-1: Column, C18 silica gel; mobile phase, X: H20 (0.5percent NH4HCO3), Y: ACN, X/Y=90/10 increasing to X/Y=5/95 within 40 mm;Detector, UV 254 nm) affording 460 mg (56percent) of 3-phenyl-N-[(ls,3s)-3-[(4-formyl-1H- pyrazol-1-yl)methyljcyclobutylj-1,2-oxazole-5-carboxamide as a yellow solid. LCMS (ES, m/z): [M+Hj?= 351.1.

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 1H-Pyrazole-4-carbaldehyde, 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. 930-36-9, name is 1-Methylpyrazole, This compound has unique chemical properties. The synthetic route is as follows., Quality Control of 1-Methylpyrazole

General procedure: To a stirred mixture of pyrazole (200 mmol) and the appropriate acid anhydride (350 mmol, 1.75 equiv), concd H2SO4(0.2 mL) was added, and the resulting mixture was stirred under a nitrogen atmosphere in an oil bath until the pyrazole was consumed. For low boiling components, this mixture was heated at reflux. Reaction conditions (temperature and time) are given in Table 2. When the reaction was complete, volatile compounds were removed under reduced pressure and the residue was poured onto 100 mL crushed ice. The reaction mixture was neutralized under vigorous stirring by the addition of 20% aqueous NaOH or (in the case of fluorinated ketones) solid KHCO3 to adjust pH to 7-8. The ketone was extracted with CH2Cl2(3 ¡Á 50 mL) and the combined organic phases were washed with brine (50 mL), dried over MgSO4, and evaporated under reduced pressure. The resulting crude ketone was purified by either distillation or recrystallization from the appropriate solvent.

According to the analysis of related databases, 930-36-9, the application of this compound in the production field has become more and more popular.

The chemical industry reduces the impact on the environment during synthesis 1904-31-0, name is 1-Methyl-1H-pyrazol-3-amine, I believe this compound will play a more active role in future production and life. 1904-31-0

2-Bromopyridine (1) (1 .Og, 6.3mmol), 1-methyl-i H-pyrazol-3-amine (2) (0.79g,8.2mmol), Xantphos (0.37g, 0.63mmol), and 052003 (4.lg, 12.6mmol) were combined in dry 1,4-dioxane (l5mL). The reaction mixture was then degassed with N2(g), and placed under vacuum for 10mm. Pd2(dba)3 (0.29g, 0.31 mmol) was added and the resulting reaction mixture was heated at 90¡ãC for 30h. It was then pouredonto demineralized water (200mL), and extracted with EtOAc (3 x lOOmL). The organic phases were combined, dried over Na2504, filtered and subsequently concentrated in vacuo. The resulting residue was purified by flash chromatography with EtOAc/Hexane (1:1) to provide N-(i -methyl-i H-pyrazol-3-yl)pyridin-2-am me (3) as a yellow solid (0.75g, 68percent).LCMS (ES): Found i75.2 [M+H].

The chemical industry reduces the impact on the environment during synthesis 1904-31-0. I believe this compound will play a more active role in future production and life.

A common heterocyclic compound, 31230-17-8, name is 5-Methyl-1H-pyrazol-3-amine, molecular formula is C4H7N3, 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. 31230-17-8.

Method 9; 2, 5 -Dichloro-N-(5 -methyl- lH-pyrazol-3 -yl)pyrimidin-4-amine; To a solution of 5-methyl-lH-pyrazol-3-amine (2.78 g, 27.3 mmol) in absolute EtOH(30 ml) was added triethylamine (5 ml) and 2,4,5-trichloropyrimidine (5.0 g, 27.3 mmol) and the resulting solution was aged at room temperature for 12 hours. The mixture was partitioned between EtOAc and H2O, the organic layer was washed with brine and dried. The solvents were removed under reduced pressure to give the title compound (4.1 g). m/z: 245.

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

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. 132712-71-1, name is 3-Methyl-1H-pyrazol-5-ol, A new synthetic method of this compound is introduced below., 132712-71-1

General procedure: Dichloromethane (10 mL) was taken in a round-bottomed flask,into which 1.0 equivalent (1 mmol) of triethylamine and pyrazolonewere poured. The mixture was stirred for 2 min without heating. To this mixture, 1.0 equivalent of corresponding presynthesized benzylidene from malononitrile was added. Then the mixture was agitated for 25-30 min. The reaction was observed by TLC. The desired products appeared as precipitates. The precipitates were washed with water to remove the unreacted pyrazolone to obtain pure products. Melting points were recordedfor crystalline substances.

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.

1192-21-8, A common heterocyclic compound, 1192-21-8, name is 1-Methyl-1H-pyrazol-5-amine, molecular formula is C4H7N3, 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.

Heat a solution of 2,4-dichloropyridine (15.3 g, 103 mmol), L-methyi5 aTninopyrazole (ii g, 113 mmoi), cesium carbonate (6 g, 10 nimol) and tris(dibenzyiideneacetone)dipaiiadium(0) (4.7 g, 5 mmoi) in 1 ,4dioxane (750 niL) in asealed vessel at 75 ¡ãC overnight. Cool the reaction to room temperature and dilute with water (1.5 L). Extract the mixture with three portions DCM, Filter the aqueous layer to remove solids and extract the filtrate with two portions EtOAc. Combine all organic extracts, dry over magnesium sulfate, filter and concentrate the filtrate. Purify the residue by silica gel column chromatography by loading the product onto a 260 g pre-coiumn andeluting the pre-colunin onto a 750 g column with a gradient from 1-5percent MeOH in DCM to give the title compound 16.8 g (78percent). MS (m/z): 209 (M+i),

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

35344-95-7, 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. 35344-95-7, name is 1H-Pyrazole-4-carbaldehyde, A new synthetic method of this compound is introduced below.

Step B: 1-({2-tert-Butyl-1-[(trans-4-fluorocyclohexyl)methyl]-1H-benzimidazol-5-yl}sulfonyl)-1H-pyrazole-4-carbaldehyde2-tert-Butyl-1-[(4-fluorocyclohexyl)methyl]-1H-benzimidazole-5-sulfonyl chloride (400 mg, 1.03 mmol), pyrazole-4-carboxaldehyde (300 mg, 3.09 mmol) (see Example 126, step H for preparation) and DMAP (catalytic) were stirred in 10 mL of DCM containing DIPEA (0.90 mL, 5.15 mmol) at rt for 3 h. The solution was washed with saturated aqueous NaHCO3 solution, brine and dried over anhydrous MgSO4. The crude product was purified by flash chromatography on silica gel using hexanes/EtOAc (1:1) as eluent. Yield: 131 mg (28percent). 1H NMR (400 MHz, CHLOROFORM-D) delta 1.16-1.26 (m, 2H), 1.35-1.48 (m, 2H), 1.54-1.56 (m, 9H), 1.72 (dd, J=8.69, 3.03 Hz, 2H), 1.95-2.04 (m, 1H), 2.11-2.19 (m, 2H), 4.17-4.21 (m, 2H), 4.37-4.46 (m, 1H), 4.50-4.59 (m, 1H), 7.44 (d, J=8.59 Hz, 1H), 7.96 (dd, J=8.69, 1.86 Hz, 1H), 8.08 (s, 1H), 8.44 (d, J=1.37 Hz, 1H), 8.64 (s, 1H), 9.91 (s, 1H).

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.

35344-95-7,Some common heterocyclic compound, 35344-95-7, name is 1H-Pyrazole-4-carbaldehyde, molecular formula is C4H4N2O, 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 the stirred solution of cyclopentyl methanesulfonate 6-3 (380 mg, 2.31 mmol) in DMF (2 mL) was added lH-pyrazole- 4-carbaldehyde 6-4 (266.81 mg, 2.78 mmol) and cesium carbonate (1.51 g, 4.63 mmol) at 0C. The reaction was heated at 80C for 16 hours and then diluted with ice cold water, extracted with ethyl acetate, washed with brine, dried over sodium sulfate, and concentrated under reduced pressure. The crude material was purified by flash chromatography using Q%~3()% ethyl acetate/hexane to afford -cyciopentylpyrazole-4-carbaldehyde 5 (280 mg, 1.71 mmol, 73.69% yield) as a brown liquid. H I NMR (400 MHz, DMSO-d6) 6 9.77 (s, 1 1 1), 8.50 (s, 1 1 1 ), 7.98 (s, lH), 4 80-4 73 (m, 1H), 2.13-2.05 (m, 2H), 1 98-1.87 (m, 2H), 1.83-1.77 (m, 21 1), 1.69-1.67 (m, 2H).

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