Category: 34334-96-8

Adding a certain compound to certain chemical reactions, such as: 34334-96-8, name is 3-Methyl-5-nitro-1H-pyrazole, 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 34334-96-8, Formula: C4H5N3O2

General procedure: The reaction was performed in 2 batches. In a sealed tube, cyanomethylenetributyl phosphorane (9.28 mL, 35.40 mmol) was added to a solution of 3-methyl-5-nitro-lH- pyrazole (1.50 g, 1 1.80 mmol) and 3-hydroxymethyl-3-methyloxethane (3.53 mL, 35.40 mmol) in toluene (100 mL). The solution was heated at 60 C for 18 h. The 2 batches were combined and the solvent was evaporated in vacuo. The residue (black oil) was purified by column chromatography on silica gel (irregular SiOH, 15-40 muiotaeta, 330 g, liquid loading on DCM, mobile phase: heptane/EtOAc, gradient from 90: 10 to 50:50). The fractions containing the product were combined and evaporated to dryness to give 3.95 g of intermediate 303 (79% yield, orange oil) directly used as it in the next step.

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 3-Methyl-5-nitro-1H-pyrazole, and friends who are interested can also refer to it.

Related Products of 34334-96-8,Some common heterocyclic compound, 34334-96-8, name is 3-Methyl-5-nitro-1H-pyrazole, molecular formula is C4H5N3O2, 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.

Add acetonitrile (56 mL) to a mixture of 5-methyi-3-nitro-1H-pyrazoie (3.0 g, 22 mniol), potassium carbonate (6.2 g, 2.0 eq), and I -bromo-3-methoxypropane (3.8 g, 1.1 eq). Stir at 65 C overnight. Cool to EtOAc (50 mE) and filter. Concentrate the filtrate in vacuo. Subject the residue to normal phase chromatography, eluting with 35% EtOAc in hexanes, to give the title compound (3.3 g, 70%). MS (ES) ,n/z 200 (M-fH).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 3-Methyl-5-nitro-1H-pyrazole, its application will become more common.

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 34334-96-8 as follows. Safety of 3-Methyl-5-nitro-1H-pyrazole

In a sealed tube, 2-(tributylphosphoranylidene)-acetonitrile (7.30 g, 30.25 mmol) was added to a solution of 5-Methyl-3-nitro-lH-pyrazole (2.00 g, 15.74 mmol) and 2- cyclopropylethanol (2.04 g, 23.68 mmol) in toluene (70 mL). The mixture was heated at 60 C for 19 h. After cooling down to rt, the mixture was diluted with EtOAc and water. The organic layer was decanted and the solvent was evaporated in vacuo. The residue was purified by column chromatography on silica gel (Irregular SiOH, 20-45 muiotaeta, 40 g, mobile phase: heptane/EtOAc, gradient from 60:40 EtOAc to 50:50). The pure fractions were combined and the solvent was evaporated until dryness to give 2.10 g of intermediate 232′ (68% yield) and 330 mg of intermediate 232 (11% yield).

According to the analysis of related databases, 34334-96-8, the application of this compound in the production field has become more and more popular.

Adding a certain compound to certain chemical reactions, such as: 34334-96-8, name is 3-Methyl-5-nitro-1H-pyrazole, 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 34334-96-8, COA of Formula: C4H5N3O2

Add acetonitrile (75 rnL) to a mixture of (2.0 g, 15rnmoi). potassium carbonate (4.1 g, 2.0 eq), and 1-chioro-2-propanol (3.8 mL, 3.0 eq).Stir at 85 C overnight. Cool to rt. Filter and rinse the solids with EtOAc. Concentrate the filtrate in vacuo to provide a residue. Subject the residue to normal phase chromatography, eluting with 50% EtOAc in hexanes, to give the title compound (2.0 g, 65%). MS (ES) ,n/z 186 (M+1-1).

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 3-Methyl-5-nitro-1H-pyrazole, and friends who are interested can also refer to it.