Tag: M.W:100-200

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. 632365-54-9, name is Methyl 5-amino-1H-pyrazole-3-carboxylate, A new synthetic method of this compound is introduced below., Recommanded Product: 632365-54-9

With stirring, a mixture of 10 g (0.046 mol) of diethyl sec-butylmalonate, 6.5 g (0.046 mol) of methyl 5-amino-1H-pyrazole-3-carboxylate and 9.4 g (0.051 mol) of tri-n-butylamine was heated at 180 C. for 6 hours. During this time, the ethanol released during the reaction was continuously distilled off. The reaction mixture was then concentred under reduced pressure. This gave 12.2 g (100% of theory) of methyl 5,7-dihydroxy-6-(sec-butyl)-pyrazolo[1,5-a]pyrimidine-3-carboxylate. The product was used for further syntheses without additional purification.

The synthetic route of 632365-54-9 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. 368870-03-5, name is (4-(1H-Pyrazol-1-yl)phenyl)methanamine, A new synthetic method of this compound is introduced below., Formula: C10H11N3

To a solution of methyl 2-(bromomethyl)-4-fluoro-6-iodobenzoate (2.54 g) obtained in Reference Example 99 in THF (30 mL) were added (4-(1H-pyrazol-1-yl)phenyl)methanamine (4.5 g), triethylamine (2.44 g) and potassium carbonate (1.67 g), and the mixture was heated under reflux under a nitrogen atmosphere for 12 hr. The reaction solution was diluted with water and ethyl acetate, and the organic layer was separated, washed with water and saturated brine, dried over anhydrous sodium sulfate, and concentrated. The residue was solidified with petroleum ether-ethyl acetate to give the title compound (2.85 g). 1H NMR (400 MHz, CDCl3) delta 4.18 (2H, s), 4.81 (2H, s), 6.47 (1H, t, J = 2.0 Hz), 7.10 (1H, dd, J = 7.6, 2.0 Hz), 7.41 (2H, d, J = 8.8 Hz), 7.60-7.80 (4H, m), 7.91 (1H, d, J = 2.4 Hz).

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.

Electric Literature of 5334-39-4,Some common heterocyclic compound, 5334-39-4, name is 3-Methyl-4-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.

To a mixture of 6,7-dihydro-5H- pyrrolofl,2-a]imidazol-7-ol (1 g, 8.06 mmol) and 3-methyl-4-nitro-lH-pyrazole (1.13 g, 8.87 mmol) in THF (20 mL) was added PPh3 (3.17 g, 12.09 mmol) and then D1AD (2.44 g, 12.09 mmol, 2.4mL) dropwise at 0 C over a period of 30 min under N2. The mixture was warmed to 20 C and stirred for 12 h, then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (gradient PE:EtOAc from 10: 1 to 0: 1) to give the mixture of 7-(3-methyl-4-nitro-pyrazol-l-yl)-6,7-dihydro-5H-pyrrolo[l,2-a]imidazole and 7-(5-methyl- 4-nitro-lH-pyrazol-l -yl)-6,7-dihydro-5H-pyrrolo[l,2-a]imidazole as a white solid. LCMS: RT 0.112 min, m/z —— 234.1 [M + H .] To a solution of 7-(3- methyl-4-nitro-pyrazol-l-yl)-6,7-dihydro-5H-pyrrolo| l,2-a|imidazole and 7-(5-methyl-4-nitro-lH- pyrazol-l-yl)-6,7-dih}’dro-5H-pyrrolo[ l,2-a]imidazole (650 mg, 2.79 mmol) in MeOH (20 mL) was added Pd-C (10%, 0.3 g) under N2. The suspension was degassed under vacuum and purged with H2 several times. The mixture was stirred under H2 (15 psi) at 20 C for 4 h, then filteredand concentrated under reduced pressure, to give the mixture of l-(6,7-dihydro-5H-pyrrolo|T,2- a]imidazol-7-yl)-3-methyl-pyrazol-4-amine and l-(6,7-dihydro-5H-pyrrolo[ l,2-a]imidazol-7-yl)-5- methyl-lH-pyrazol-4-amine as a light yellow solid. LCMS: RT 0.62-0.878 min, m/z = 204.2 [M+H]~.

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-4-nitro-1H-pyrazole, its application will become more common.

Application of 16034-46-1, The chemical industry reduces the impact on the environment during synthesis 16034-46-1, name is 1-Methyl-1H-pyrazole-5-carboxylic acid, I believe this compound will play a more active role in future production and life.

1-Methyl-4-nitropyrazole-5-carboxylic acid 18.8 g of 1-methylpyrazole-5-carboxylic acid (mp 227 to 228 C.) are stirred in a mixture consisting of 23.5 of 100% strength nitric acid and 17 ml of 25% strength oleum for 8 hours at from 55 to 60 C. and for 4.5 hours at from 70 to 75 C. The mixture is poured onto ice and extracted with 9:1 methylene chloride/ethanol. The extract is concentrated. This yields 27 g of 1-methyl-4-nitropyrazole-5-carboxylic acid, mp 162 to 164 C., with decomposition (from ethyl acetate).

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, 1-Methyl-1H-pyrazole-5-carboxylic acid, other downstream synthetic routes, hurry up and to see.

Application of 2075-46-9, 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. 2075-46-9, name is 4-Nitro-1H-pyrazole, This compound has unique chemical properties. The synthetic route is as follows.

A mixture of 4-nitro-l/f-pyrazole (1.13 g, 10 mmol), Pd/C (10%, 57 mg) in ethanol (20 mL) was hydrogenated at 20-30 psi on a parr apparatu overnight. The reaction mixture was filtered through celite, washed with ethanol (10 mL). The filtrate was concentrated to get desired compound 0113-42 (404 mg, 49%) as a brown solid. LC-MS: 84 [M+l]+; 1H-NMR (400 MHz, DMSO-d6) delta 3.11 (br s, 2H), 6.99 (s, 2H), 11.92 (s, IH).

The chemical industry reduces the impact on the environment during synthesis 4-Nitro-1H-pyrazole. I believe this compound will play a more active role in future production and life.

Application of 473528-88-0, 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. 473528-88-0, name is 4-Bromo-1-methyl-1H-pyrazole-5-carbaldehyde belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below.

Preparation 142: 1 -Methyl-4-(4,4,5,5-tetramethyl-1 ,3,2-dioxaborolan-2-yl)-1 H-pyrazole- e A mixture of 4-bromo-1 -methyl-1 H-pyrazole-5-carbaldehyde (150 mg, 0.794 mmol), KOAc (234 mg, 2.38 mmol), Pd(dppf)CI2 FontWeight=”Bold” FontSize=”10″ DCM (33.6 mg, 0.040 mmol) and bis(pinacolato)diboron (222 mg, 0.873 mmol) in dioxane (4 mL) was stirred at ^ 00 oC under microwave irradiation for 1 hour. The reaction mixture was diluted with EtOAc. The mixture was filtered and purified using Biotage silica gel column chromatography eluting with 20% EtOAc/ cyclohexanes to give the title compound (96 mg, 51 %). 1 H NMR (500 MHz, CDCI3): 0 10.28 (s, 1 H), 7.79 (s, 1 H), 4.20 (s, 3H), 1 .34 (s, 12H). LCMS (ESI) Rt = 2.55 minutes MS m/z 237 [M+H]+

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-Bromo-1-methyl-1H-pyrazole-5-carbaldehyde, other downstream synthetic routes, hurry up and to see.

Synthetic Route of 5203-77-0,Some common heterocyclic compound, 5203-77-0, name is 1,3-Dimethyl-1H-pyrazol-5-ol, molecular formula is C5H8N2O, 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.

Weigh 1.7g (0.015mol) 1,3- dimethyl-5-pyrazolone-ol in 250mLthree-necked flask was added 50mL1,2-Dichloroethane was dissolved and weighed 4.0g (0.040mol) oftriethylamine in the system. Under ice cooling, Intermediate (a-2) of1,2-dichloroethane solution (0.010mol (a-2)) was addeddropwise to the system, during the addition using argon. After the reaction 1hThe reaction was followed by HPLC, the reaction was completefeed reaction solution containing intermediate (a-3) a. Counter-containingintermediate (a-3) ofLiquid should be supplemented with 1.0g (0.010mol) oftriethylamine and several drops of acetone cyanohydrin, temperature controlledat 50 ~ 60 and argon gas protectionProtection, response 2h, HPLC trace reaction. Aftercompletion of the reaction was added 100mL of water was slowly added dropwiseHCl, stirring at room temperature, until pH = 3about. 200mL extract was washed with water to remove theaqueous layer, the organic layer was washed twice, dried over anhydrous sodiumsulfate, the organic solvent was removed by rotary evaporation,To give 3.6g a tan solid, a powdered compound a.

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

Application of 25016-17-5, 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. 25016-17-5, name is Methyl 5-methyl-1H-pyrazole-3-carboxylate, This compound has unique chemical properties. The synthetic route is as follows.

b) Method for svnthesising the pyrazolecarboxylic acid ED-2b (synthesis method B)ED-5a (2.00 g, 14.3 mmol) in DMF (7 mL) is added dropwise to a suspension of NaH (694 mg, 60 %, 17.4 mmol) in anhydrous DMF (8 mL) while cooling with ice and the mixture is slowly thawed to RT over 1 h. Then isopropyl bromide (2.7 mL, 28.8 mmol) is added and the mixture is stirred for 20 h at RT. The reaction mixture is mixed with a little water, then for saponification aqueous LiOH solution (414 mg in 3 mL H20) is added and the mixture is stirred for 2 h at 40C. The reaction mixture is neutralised with hydrochloric acid, evaporated down to some extent using the rotary evaporator and the residue is purified by preparative RP-MPLC. The product-containing fractions of ED-2b (HPLC-MS: tRet. = 0.00 min; MS (M-H)” = 167) are combined and freeze-dried.

The chemical industry reduces the impact on the environment during synthesis Methyl 5-methyl-1H-pyrazole-3-carboxylate. I believe this compound will play a more active role in future production and life.

Application of 14531-55-6,Some common heterocyclic compound, 14531-55-6, name is 3,5-Dimethyl-4-nitro-1H-pyrazole, molecular formula is C5H7N3O2, 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 solution of 3,5-dimethyl-4-nitro-1 H-pyrazole (0.5 g, 3.54 mmol) in acetonitrile (10 mL), K2C03 (1.4 g, 10.62 mmol) was added and the mixture was stirred at room temperature for 30 minutes. Then tert-butyl-(2-chloroethoxy)dimethylsilane (1.2 g, 5.31 mmol) was added dropwise. The mixture was heated at reflux overnight. To the cooled reaction mixture H20 (20 ml) was added and the product was extracted with ethyl acetate (3 x 50 ml), the organic layers were combined, dried over Na2S04 and evaporated under reduced pressure. The residue was purified on HP-Sil SNAP cartridges using a Biotage Isolera One purification system employing an EtOAc/n-heptane gradient (5/95 -> 40/60) to afford the title compound which was used in the next step without further purification (0.72 g, 68 %). 1H-NMR (400 MHz, DMSO-d6) delta = 4.20 (t, 2H), 3.90 (t, 2H), 2.60 (s, 3H), 2.41 (s, 3H), 0.78 (s, 9H), -0.09 (s, 6H)

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 3,5-Dimethyl-4-nitro-1H-pyrazole, its application will become more common.

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. 4058-91-7, name is 5-Amino-1-methyl-1H-pyrazole-4-carboxylic acid, A new synthetic method of this compound is introduced below., Quality Control of 5-Amino-1-methyl-1H-pyrazole-4-carboxylic acid

56 To a solution of 5-AMINO-L-METHYL-LH-PYRAZOLE-4- carboxylic acid (7.1 g), N- (2-AMINOETHYL) tritylamine (15.1 g) and triethylamine (10.1 g) in chloroform (200 ml) was added N- (3-DIMETHYLAMINOPROPYL)-N – ethylcarbodiimide hydrochloride (9.6 g), and the mixture was stirred at room temperature for 16 hours. The reaction mixture was washed successively with 10% aqueous citric acid solution, brine and saturated aqueous sodium hydrogencarbonate solution. The organic layer was dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The residue was triturated with ethyl acetate and dried in vacuo to give 5-AMINO-1- METHYL-N- [2- (TRITYLAMINO) ETHYL]-LH-PYRAZOLE-4- carboxamide (11.4 g) as a solid. 1H-NMR (CDCl3) 8 2.35-2. 38 (2H, m), 3.45-3. 49 (2H, M), 3.63 (3H, s), 5.15 (1H, br), 5.91 (1H, br), 7.17-7. 49 (16H, m)

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.