Tag: M.W:200-300

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. 15802-75-2, name is 4-Iodo-3-methyl-1H-pyrazole belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below. COA of Formula: C4H5IN2

Under nitrogen protection,To a 10 ml Schlek reaction tube (a glass instrument commonly used in anhydrous oxygenless operation) was added 1.0 mmol2-iodo-5- (2-iodopyrimidine-3) pyrimidine, 2.0 mmol of 3-methyl-4-iodopyrazole, 0.03 mmol of palladium acetate,0.05 mmol di-t-butyl (2 ‘, 4′, 6′-triisopropyl-3,6-dimethoxybiphenyl-2-yl)4.0 mmol of sodium tert-butoxide, and 5 ml of toluene, the reaction tube was purged with nitrogen three times,And then heated to 110 C with an oil bath under magnetic stirring, and the reaction was refluxed for 24 hours. Down to room temperatureThe reaction solution was further added, 3.0 mmol of 4-carboxyphenylboronic acid, 0.02 mmol of palladium acetate, 0.04 mmol2′-dicyclohexyl-2,6-dimethoxy-3-sulfonic acid-1,1’-biphenyl sodium salt, 7.0 mmol sodium carbonate,And 100 mmol of water; then heated to 100 C with an oil bath under magnetic stirring and the reaction was refluxed for 24 hours.Down to room temperature; add 20 ml of water, filtration, with concentrated hydrochloric acid to adjust the pH of the filtrate to 1, room temperature stirring 3h,Filtered, washed with ethanol, dried product 16, yield 72%. The product (C30H22N8O4)Of the mass spectrum (ESI) of 558.20.

The synthetic route of 15802-75-2 has been constantly updated, and we look forward to future research findings.

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. 73387-46-9, name is 3-(4-Bromophenyl)-1H-pyrazole belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below. Product Details of 73387-46-9

Production Example 138 3-(4-Bromophenyl)-1-trityl-1H-pyrazole 32.71 g of the title compound was obtained as pale brown crystals from 6.74 g 3-(4-bromophenyl)-1H-pyrazole (compound in Production Example 125) by the same method as in Production Example 15.1H-NMR (CDCl3) delta: 6.51(d, J=2.4Hz, 1H), 7.20(m, 6H), 7.29(m, 10H), 7.45(d, J=8.8Hz, 2H), 7.65(d, J=8.8Hz, 2H)

The synthetic route of 73387-46-9 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. 138907-68-3, name is Ethyl 5-amino-1-(4-fluorophenyl)-1H-pyrazole-4-carboxylate, This compound has unique chemical properties. The synthetic route is as follows., Product Details of 138907-68-3

Intermediate 9: 5-Amino-1-(4-fluorophenyl)-1 H-pyrazole-4-carboxylic acid. To a suspension of ethyl 5-amino-1-(4-fluorophenyl)-1 H-pyrazole-4-carboxylate (12.1g, 48.5mmol) in ethanol (250ml) was added a solution of lithium hydroxide(5.8g, 242mmol) in water (100ml). The mixture was stirred at reflux for 2.5hr. It was allowed to cool and concentrated to 50% of its volume before 5M hydrochloric acid(47ml) was added. After stirring for 15mins, the resulting white solid was filtered off and further 5M hydrochloric acid (3ml) was added. This was filtered and the combined solids were washed with water and diethyl ether and then dried under vacuum to give the title compound (10.27g).1 H NMR (400 MHz, DMSO-d6) deltappm 12.09 (br. s., 1 H) 7.67 (s, 1 H) 7.54 – 7.60 (m, 2H) 7.34 – 7.41 (m, 2 H) 6.29 (br. s., 2 H).LC-MS Retention Time 2.20mins, MH+ 222.

According to the analysis of related databases, 138907-68-3, 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. 84547-84-2, name is 4-Bromo-1-methyl-1H-pyrazole-5-carboxylic acid belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below. SDS of cas: 84547-84-2

To a solution of N-methyl-4-bromopyrazole-3-carboxylic acid (2.0 g), available from step A, in 65 mL of anhydrous DMF was added bromotripyrrolidinophosphonium hexafluorophosphate (PyBrop, 4.60 g), dimethyl amine (10 mL, 2.0 M in THF) and diisopropylethyl amine (5.2 mL) at 25 C. The mixture was stirred for 26 h, and concentrated under reduced pressure to an oily residue. This residue was treated with a 1.0 M NaOH aqueous solution, and extracted with ethyl acetate (50 mL?4). The organic extracts were combined, washed with brine, and dried with anhydrous Na2SO4. Removal of solvents yielded an oil, which was purified by preparative thin layer chromatography, eluting with CH2Cl2-MeOH (20:1), to give 1.09 g of the amide product (48%, MH+=232.0).

The synthetic route of 84547-84-2 has been constantly updated, and we look forward to future research findings.

Electric Literature of 138907-68-3, These common heterocyclic compound, 138907-68-3, name is Ethyl 5-amino-1-(4-fluorophenyl)-1H-pyrazole-4-carboxylate, 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.

PREPARATION G Ethyl 1-(4-fluorophenyl)-1H-pyrazole-4-carboxylate A stirred suspension of ethyl 5-amino-1-(4-fluoro-phenyl)-1H-pyrazole-4-carboxylate (7.48 g, 30.0 mmole), prepared as described in Preparation A, above, and isopentyl nitrite (7.03 g, 60.0 mmole) in 80 ml of tetrahydrofuran was refluxed for twenty-four hours and then evaporated in vacuo. The residue was triturated with 50 ml of methanol and filtered to furnish 5.18 g (74% yield) of off-white solid. The sample was recrystallized from ethanol, m.p. 119-21 C. Analysis: Calculated for C12 H11 FN2 O2: C, 61.53; H, 4.73; N, 11.96%. Found: C, 61.41; H, 4.51; N, 11.95%.

The synthetic route of 138907-68-3 has been constantly updated, and we look forward to future research findings.

Application of 82231-58-1, These common heterocyclic compound, 82231-58-1, name is Ethyl 2-(4-bromo-1H-pyrazol-1-yl)acetate, 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.

[00393] To a mixture of 58-8 (200.0 mg, 0.6 mmol, 1.00 eq), 58-3 (154.0 mg, 0.7 mmol, 1.20 eq) and Na2C03 (116.7 mg, 1.1 mmol, 2.00 eq) in dioxane (4.0 mL) and H20 (0.5 mL), was added Pd(dppf)Cl2 (40.3 mg, 55.1 umol, 0.10 eq). The mixture was degassed under vacuum and purged with N2 3 times. The resulting mixture was stirred at 100 C for 17 h. LCMS showed the reaction was complete. The mixture was concentrated under vacuum. The residue was purified by silica gel chromatography to afford the crude products. The crude products were purified by prep-HPLC (acidic HC1 condition) to provide Compound 58 and Compound 59. [00394] Compound 58: 2.31 mg, 4.4 umol, 0.8% yield, HC1. LCMS (ESI): RT = 0.852 min, mass calc. for C20Hi8F3N3O2 389.14, m/z found 390.0 [M+H]+. 1HNMR (400MHz, CHLOROF ORM-i ) 7.74 (s, 1H), 7.66 (s, 1H), 7.41 (dd, J= 1.5, 7.5 Hz, 1H), 7.38 – 7.31 (m, 2H), 7.29 – 7.24 (m, 1H), 7.20 (s, 1H), 7.15- 7.06 (m, 3H), 5.78 (s, 1H), 4.94 (s, 2H), 4.26 (q, J= 7.0 Hz, 2H), 1.30 (t, J= 7.2 Hz, 3H). [00395] Compound 59: 52.51 mg, 0.1 mmol, 24.0% yield, HC1. LCMS (ESI): RT = 0.783 min, mass calc. for Ci8Hi4F3N302 361.10, m/z found 361.9 [M+H]+. 1HNMR (400MHz, METHANOL-d4) 7.81 (s, 1H), 7.65 (s, 1H), 7.49 (d, J= 7.5 Hz, 1H), 7.34- 7.27 (m, 2H), 7.26 – 7.21 (m, 1H), 7.15- 7.10 (m, 1H), 7.09 – 7.06 (m, 2H), 6.97 (d, J= 7.8 Hz, 1H), 4.77 (s, 2H).

Statistics shows that Ethyl 2-(4-bromo-1H-pyrazol-1-yl)acetate is playing an increasingly important role. we look forward to future research findings about 82231-58-1.

Application of 500011-84-7, The chemical industry reduces the impact on the environment during synthesis 500011-84-7, name is 3-Bromo-1-(dimethylsulfamoyl)pyrazole, I believe this compound will play a more active role in future production and life.

Step B: Preparation of 3-bromopyrazole;To trifluoroacetic acid (70 mL) was slowly added 3-bromo-iV,N-dimethyl-lH- pyrazole-1 -sulfonamide (i.e. the bromopyrazole product of Step A) (57.04 g). The reaction mixture was stirred at room temperature for 30 minutes and then concentrated at reduced pressure. The residue was taken up in hexane, insoluble solids were filtered off, and the hexane was evaporated to afford the crude product as an oil. The crude product was further purified by chromatography on silica gel using ethyl acetate/dichloromethane (10:90) as eluent to afford an oil. The oil was taken up in dichloromethane, neutralized with aqueous sodium bicarbonate solution, extracted with methylene chloride (3x), dried over magnesium sulfate and concentrated to afford 25.9 g of the title product as a white solid, m.p. 61-64 C. 1H NuMR (CDCl3): delta 12.4 (br s,lH), 7.59 (d,lH), 6.37 (d,lH).

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, 3-Bromo-1-(dimethylsulfamoyl)pyrazole, other downstream synthetic routes, hurry up and to see.

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. 83-10-3, name is 1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazole-4-carboxylic acid, A new synthetic method of this compound is introduced below., SDS of cas: 83-10-3

Step 1) N-(3-chloro-4-hydroxyphenyl)-1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazole-4-carboxamide To a suspension of 4-amino-2-chlorophenol (4.0 g, 28.00 mmol) and 1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazole-4-carboxylic acid (7.4 g, 30.11 mmol) in DCM (70 mL) were added EDCI (6.65 g, 30.11 mmol) and HOAT (0.76 g, 5.68 mmol). The mixture was stirred at 45 C. for 20 hours, then cooled to rt and filtered. The filter cake was washed with DCM (20 mL*3), and dried at 50 C. in a vacuum oven overnight to give the title product as a gray solid (7.1 g, 72.1%). MS (ESI, pos. ion) m/z: 358.1 [M+H]+; 1H NMR (400 MHz, DMSO-d6): delta (ppm) 10.56 (s, 1H), 9.92 (s, 1H), 7.59 (m, 2H), 7.50 (m, 1H), 7.42 (m, 2H), 7.83 (dd, J=2.6 Hz, 8.7 Hz, 1H), 6.90 (d, J=8.7 Hz, 1H), 6.88 (dd, J=9.6 Hz, 8.8 Hz, 1H), 3.33 (s, 3H), 2.68 (s, 3H).

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 16078-71-0, 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. 16078-71-0, name is Ethyl 5-amino-1-phenyl-1H-pyrazole-4-carboxylate belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below.

A mixture of 2 (0.01 mol), and ethyl-5-amino-1-phenyl-1Hpyrazole-4-carboxylate in 1,4-dioxane 10 ml containingthree drops of triethylamine was heated under reflux for 3 h.The reaction mixture was poured into crushed ice water, andacidified with dil. HCl. The solid obtained was recrystallizedfrom dioxane to give 17. White needles; yield 69%;mp. 130-131oC; IR (KBr) numax 3344, 3217 (2NH), 2927(CH-aliph.), 1658 (C=O), 1624 (C=N), 1384, 1157 cm-1(SO2); 1H NMR (DMSO-d6, 300 MHz,): delta = 1.23 (t, 3H,CH3), 4.47 (q, 2H, CH2), 5.67 (s, 2H, pyrazole-H), 6.47 (s,1H, pyrazole-H), 7.4-7.64 (m, 15H, Ar- H+ NH), 10.37,11.71 ppm (2s, 2H, 2NH, exchangeable with D2O); EIMSm/z 558 (M-29 (C2H5)), 73 (100); anal. calcd. ForC28H25N7O4 S2: C, 57.23; H, 4.29; N, 16.68. Found: C,57.40; H, 4.50; N, 16.90.

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, Ethyl 5-amino-1-phenyl-1H-pyrazole-4-carboxylate, other downstream synthetic routes, hurry up and to see.

Application of 497832-99-2,Some common heterocyclic compound, 497832-99-2, name is 4-Bromo-1-methyl-3-(trifluoromethyl)-1H-pyrazole, molecular formula is C5H4BrF3N2, 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 a stuffed mixture of XXXX-1 (400 mg, 2.4 mmol), XXXX-2 (500 mg, 2.18 mmol), and K3P04 (2 M, 1.1 mL, 2.2 mmol) in dioxane (20 mL) was added Pd(dppf)C12 (160 mg, 0.2 18 mmol) under N2 protection. The reaction mixture was degassed with nitrogen again and stirred at 90C overnight. The mixture was concentrated, diluted with H20 (20 mL), extracted with EtOAc (30 mLx3). The combined organic layer was washed with brine, dried over anhydrous Na2SO4, and concentrated in vacuo. The residue was purified by column chromatography (PE/EA=2/ 1) to give XXXX-3 (400 mg, 67% yield).

The synthetic route of 497832-99-2 has been constantly updated, and we look forward to future research findings.