Category: 42098-25-9

Adding a certain compound to certain chemical reactions, such as: 42098-25-9, name is 5-Chloro-1-methyl-4-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 42098-25-9, category: pyrazoles-derivatives

Intermediate 43 1-tert-butyl 3-methyl 2-(1-methyl-4-nitro-1H-pyrazol-5-yl)malonate Potassium carbonate (15.40 g, 111.42 mmol) was added in one portion to a stirred, RT solution of 5-chloro-1-methyl-4-nitro-pyrazole (6.0 g, 37.140 mmol) and tert-butyl methyl melonate (8.74 g, 50.139 mmol) in anhydrous DMSO (100 mL) under nitrogen. The mixture was heated at 75 C. for 3 hours before being cooled and allowed to stand at RT overnight. The mixture was poured into water (500 mL), acidified with 2N HCl (80 ml, PH 5) and extracted with EtOAc (2*250 mL, 2*200 ml). The combined organics were dried (MgSO4) and the solvent removed under reduced pressure. The residue was purified via silica gel chromatography (0-30% EtOAc/heptane) to afford 1-tert-butyl 3-methyl 2-(1-methyl-4-nitro-1H-pyrazol-5-yl)malonate as a colorless solid (10.3 g, 92.7%).

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 5-Chloro-1-methyl-4-nitro-1H-pyrazole, and friends who are interested can also refer to it.

Some common heterocyclic compound, 42098-25-9, name is 5-Chloro-1-methyl-4-nitro-1H-pyrazole, molecular formula is C4H4ClN3O2, 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 C4H4ClN3O2

Example 56 3,3-Difluoro-1-(1-methyl-4-nitro-1H-pyrazol-5-yl)piperidine A mixture of 5-chloro-1-methyl-4-nitro-1H-pyrazole (0.1 g, 4.5 mmol), 3,3-difluoropiperidine hydrochloride (0.14 g, 0.93 mmol) and DIPEA (0.5 mL, 2.8 mmol) in EtOH (3 mL) was heated at 130 C. in a microwave for 1 hr. Additional DIPEA (0.5 mL, 2.8 mmol) and 3,3-difluoropiperidine hydrochloride (0.29 g, 1.8 mmol) were added and the mixture was heated at 130 C. in a microwave for 2 hr. The solvent was removed under reduced pressure and the crude product was purified via silica gel column chromatography (0-60% EtOAc/isohexane) to yield 3,3-difluoro-1-(1-methyl-4-nitro-1H-pyrazol-5-yl)piperidine as a yellow oil (127 mg, 83%). 1H NMR (400 MHz, CDCl3) delta 8.04 (s, 1H), 3.80 (s, 3H), 3.41-3.29 (m, 2H), 3.26-3.04 (m, 2H), 2.17-2.03 (m, 2H), 1.97-1.88 (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 42098-25-9, its application will become more common.

Adding a certain compound to certain chemical reactions, such as: 42098-25-9, name is 5-Chloro-1-methyl-4-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 42098-25-9, Formula: C4H4ClN3O2

Example 354 5-amino-2-(2,6-difluorophenyl)-N-[1-methyl-5-(9-oxa-3,7-diazabicyclo[3.3.1]nonan-3-yl)pyrazol-4-yl]thiazole-4-carboxamide 354 [1008] RRN No.1703,1706,1708,1710Step A. To a microwave reaction vial was added 5-chloro-1-methyl-4-nitro-1H-pyrazole (141 mg, 0.88 mmol), tert-butyl 9-oxa-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate (200 mg, 0.88 mmol). Ethanol (8 mL) and diisopropylethylamine (0.92 mL, 5.25 mmol) were added and the mixture was irradiated with a microwave for 60 min at 130 C. The mixture was cooled, concentrated and purified via flash chromatography, ethyl acetate/ heptane 0% to 100% to afford yellow oil tert-butyl 7-(2-methyl-4-nitro-pyrazol-3-yl)-9-oxa-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate (202 mg, 65%).

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, 5-Chloro-1-methyl-4-nitro-1H-pyrazole, other downstream synthetic routes, hurry up and to see.

Reference of 42098-25-9,Some common heterocyclic compound, 42098-25-9, name is 5-Chloro-1-methyl-4-nitro-1H-pyrazole, molecular formula is C4H4ClN3O2, 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: tert-Butyl 2-(2,6-difluorophenyl)-4-(1-methyl-5-(tert-butyloxycarbonylpyrrolidin-3-yl)-1H-pyrazol-4-ylcarbamoyl)thiazol-5-ylcarbamate 5-Chloro-1-methyl-4-nitro-1H-pyrazole (0.2 g, 1.24 mmol), tert-butyl 3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2,5-dihydro-1H-pyrrole-1-carboxylate (0.437 g, 1.48 mmol) and aqueous Na2CO3/KOAc solution (1:1, 1.1 M, 1.5 mL) were suspended in MeCN (5 mL). The mixture was degassed under a stream of nitrogen for 5 min. Pd(dppf)2Cl2 (0.1 g, 0.123 mmol) was added and the mixture was heated at 130 C. in a microwave for 90 min. A further portion of Pd(dppf)2Cl2 (50 mg, 0.06 mmol) was added and the mixture was heated at 130 C. for a further 90 min. The solvents were removed under reduced pressure and the crude residue partitioned between EtOAc and water. The organic layer was separated, dried over MgSO4 and concentrated under reduced pressure. The crude product was purified via silica gel column chromatography (40-60% EtOAc/isohexane) to give the intermediate nitro-pyrazole as a yellow oil (76 mg, 21%).

The synthetic route of 42098-25-9 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. 42098-25-9, name is 5-Chloro-1-methyl-4-nitro-1H-pyrazole, This compound has unique chemical properties. The synthetic route is as follows., HPLC of Formula: C4H4ClN3O2

Nitrogen was bubbled through a solution of 3-chloro-2-methyl-4-nitro-pyrazole (16 g, 100 mmol), potassium vinyltrifluoroborate (18 g, 134 mmol) and cesium carbonate (3.7 M in water, 50 mL, 190 mmol) in DMF (100 mL). l,l’-Bis(diphenylphosphino)ferrocene- palladium(II)dichloride dichloromethane complex (900 mg, 1.10 mmol) was added and degassing continued for 30 min. The reaction mixture was heated at 110 C for 18 hr. More l, -bis(diphenylphosphino)ferrocene-palladium(II)dichloride dichloromethane complex (900 mg, 1.10 mmol) was added and heating continued for 24 hr. More 1,1′- bis(diphenylphosphino)ferrocene-palladium(II)dichloride dichloromethane complex (400 mg, 0.49 mmol) was added and heating continued for 4 hr. The reaction was cooled to room temperature and brine (200 mL) and EtOAc (500 mL) were added. The organic layer was washed with water (4 x 300 mL), separated, dried over Na2S04 and concentrated under reduced pressure. Purification via silica gel column chromatography (0-40% EtOAc/isohexane) gave l-methyl-4-nitro-5-vinyl-lH-pyrazole as a colourless solid (9.1 g). Through a solution of this solid (9.1 g, 59 mmol) in DCM (400 mL) cooled to -78 C was bubbled ozone. When the solution turned blue, ozone addition was stopped. Nitrogen was passed through the solution until the blue colour was discharged. The mixture was allowed to warm to room temperature and flushed with nitrogen for 15 min. Anhydrous dimethyl sulfide (5 mL) was added and the mixture warmed to room temperature. After stirring for 12 hr, the solvents were removed under reduced pressure. DCM (150 mL) was added and the mixture was washed with water (50 mL). The aqueous layer was extracted with DCM (3 x 100 mL) and the combined organic layers were washed with brine (100 mL), separated, dried over Na2S04 and concentrated to give 2-methyl-4-nitro-pyrazole-3-carbaldehyde as a yellow- orange solid (6.6 g, 43% over two steps). NMR (400 MHz, CDC13) delta 10.51 (s, 1H), 8.11 (s, 1H), 4.23 (s, 3H).

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 42098-25-9.

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. 42098-25-9, name is 5-Chloro-1-methyl-4-nitro-1H-pyrazole, A new synthetic method of this compound is introduced below., Recommanded Product: 42098-25-9

General procedure: KO’Bu (938 mg, 8.36 mmol) was added to a stirred solution of 5-chloro-l-methyl-4- nitro-lH-pyrazole (900 mg, 5.57 mmol) and cyclopropanol (970.713 mg, 16.713 mmol) in MeCN (7.27 mL) at rt. Addition was done portionwise. The mixture was stirred at rt for 3hours. Water was added and the mixture acidified with 3N HCl(aq). The reaction mixture was extracted with DCM, dried over MgS04, filtered and evaporated. A purification was performed via preparative LC (Stationary phase: irregular SiOH 15- 40muiotaeta 80g GraceResolv, Mobile phase: gradient from 100% DCM to 98% DCM, 2% MeOH, 0, 1% NH4OH) to afford intermediate 620 (470 mg, yield 46 %).

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.

Reference of 42098-25-9,Some common heterocyclic compound, 42098-25-9, name is 5-Chloro-1-methyl-4-nitro-1H-pyrazole, molecular formula is C4H4ClN3O2, 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 A. tert-Butyl 4-(1-methyl-4-nitro-1H-pyrazol-5-yl)-1,4-diazepane-1-carboxylate A mixture of 5-chloro-1-methyl-4-nitro-1H-pyrazole (0.403 g, 2.50 mmol) (prepared as described for Intermediate 1, Step A and B), tert-butyl 1,4-diazepane-1-carboxylate (0.500 g, 2.50 mmol) and DIPEA (0.791 mL, 4.54 mmol) in EtOH (2 mL) was heated under microwave irradiation at 130 C. for 1 h. The mixture was concentrated under reduced pressure and the resulting residue was purified by column chromatography on silica gel using CombiFlash apparatus eluting with EtOAc/hexane (50-100%). The purification afforded 0.572 g (70.4% yield) of the sub-title compound as a yellow oil. LCMS calc. for C14H23N5O4Na (M+Na)+: m/z=348.2. found: 348.1.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 5-Chloro-1-methyl-4-nitro-1H-pyrazole, its application will become more common.