Day: November 27, 2020

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. 25222-43-9, name is (1H-Pyrazol-4-yl)methanol, A new synthetic method of this compound is introduced below., 25222-43-9

6-(2,2-Diphenyl-ethylamino)-9-((lR,4S)-4-ethoxycarbonyloxy-cyclopent-2-enyl)-9H-purine-2- carboxylic acid methyl ester (4.91 g, 9.3 mmol), (lH-Pyrazol-4-yl)-methanol (1.0 g, 10.2 mmol) and PhyP (0.73 g, 2.8 mmol) are dissolved in dry, deoxygenated tetrahydrofuran under EPO argon. Pd2(dba)3 (0.85 g, 0.93 mmol) is added to the reaction mixture. The reaction mixture is heated at 45¡ã C for 1 hour. The solvent is removed in vacuo. The title material is obtained by flash column chromatography (silica, eluent 0percent MeOH to 3percent MeOH in DCM) (MH+ 536.42).

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.

Adding a certain compound to certain chemical reactions, such as: 16034-46-1, name is 1-Methyl-1H-pyrazole-5-carboxylic acid, 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 16034-46-1, 16034-46-1

1) N-methoxy-N,1-dimethyl-1H-pyrazol-5-carboxamide N,O-dimethylhydroxylamine hydrochloride (1.30 g) was added to an dimethylformamide (32 mL) solution that contained 1-methyl-1H-pyrazol-5-carboxylic acid (1.21 g), O-(7-azabenzotriazol-1-yl)-N,N,N’,N’-tetramethyluronium hexafluorophosphate (4.38 g) and diisopropylethylamine (3.34 mL) at a room temperature, and the obtained solution was then stirred for 2 hours. Thereafter, water was added to the reaction solution, and the obtained mixture was then extracted with ethyl acetate. The organic layer was washed with water and a saturated saline, and was then dried over anhydrous magnesium sulfate, followed by vacuum concentration. The residue was purified by column chromatography (silica gel cartridge, chloroform_methanol=100:0 to 95:5), so as to obtain the title compound (1.03 g) in the form of a yellow oily substance. 1H NMR (200 MHz, CHLOROFORM-d) delta ppm 3.36 (s, 3H) 3.66 (s, 3H) 4.13 (s, 3H) 6.77 (d, J=2.20 Hz, 1H) 7.48 (d, J=2.20 Hz, 1H); MS (ESI pos.) m/z: 170 [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, 1-Methyl-1H-pyrazole-5-carboxylic acid, other downstream synthetic routes, hurry up and to see.

39806-90-1, A common heterocyclic compound, 39806-90-1, name is 4-Iodo-1-methyl-1H-pyrazole, molecular formula is C4H5IN2, 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.

To a solution of intermediate 21.2 (250 mg, 0.754 mmol) and 4-iodo-l-methyl-lH-pyrazole (204 mg, 0.981 mmol) in anhydrous Dioxane (3 mL) was added (/ra/ v)-N i.N2-dimethylcyclohexane- 1, 2-diamine (42.9 mg, 0.302 mmol), potassium phosphate (480 mg, 2.263 mmol) and Cul (28.7 mg, 0.151 mmol). The resulting mixture was stirred at 90C for 16 hours under N2 protection . After filtration and evaporation, the crude residue was purified by silica gel column chromatography (gradient eluent of 0% to 21% EtO Ac/Petroleum ether) to give intermediate 21.3, ( R,R and 5′,5′)-tert-butyl 3-hydroxy-4-(5-methyl-l-(l-methyl-lH-pyrazol-4-yl)-lH-indazol-6- yl)piperidine-l -carboxylate. MS (ESI) m/z calc?d for C22H30N5O3 [M+H]+ 412, found 412.

The synthetic route of 39806-90-1 has been constantly updated, and we look forward to future research findings.

18048-64-1, These common heterocyclic compound, 18048-64-1, name is 1-(3,4-Dimethylphenyl)-3-methyl-1H-pyrazol-5(4H)-one, 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.

A pyrazole (j) prepared by the method of Scheme II is treated with a sulfonyl azide such as p-toluenesulfonyl azide in the presence of a base typically triethylamine or pyridine in a suitable solvent such as ethanol, methanol or tetrahydrofuran to afford diazopyrazole (k).

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 18048-64-1.

1128-54-7, A common heterocyclic compound, 1128-54-7, name is 3-Methyl-1-phenyl-1H-pyrazole, molecular formula is C10H10N2, 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.

To 100 ml round bottom flask was added 3-methyl-1-phenyl -1H- pyrazole (1.58 g, 0.010 mol), was added 50 ml of carbon tetrachloride was added N- bromosuccinimide at room temperature (2.20 g, 0.012 mol), was added a catalytic amount of azobisisobutyronitrile (of AIBN), the reaction was warmed to reflux and maintained under reflux conditions for 2 hours. After the reaction was stopped, cooled to room temperature, filtered to remove the solid in the system, the filtrate was concentrated by column chromatography (eluent: ethyl acetate: petroleum ether = 1: 100) to obtain 1.60 g of 1-phenyl-3-bromo methyl -1H- pyrazole as a white solid in 70% yield.

The synthetic route of 1128-54-7 has been constantly updated, and we look forward to future research findings.

Adding some certain compound to certain chemical reactions, such as: 141573-95-7, name is Ethyl 3-(difluoromethyl)-1-methyl-1H-pyrazole-4-carboxylate, 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 141573-95-7. 141573-95-7

The compound of formula (III) was added to a 5% aqueous solution of sodium hydroxide, reacted at 60 C for 3 hours, and then hydrochloric acid was added to neutralize the pH to a weak acidity,(IV) 1-methyl-3-difluoromethyl-1H-pyrazole-4-carboxylic acid;The compound of formula (IV) (40 mmol) was refluxed with thionyl chloride (0.4 mol) for 4 hours and distilled under reduced pressure to give(V) 1-methyl-3-difluoromethyl-1H-pyrazole-4-carbonyl chloride;

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 Ethyl 3-(difluoromethyl)-1-methyl-1H-pyrazole-4-carboxylate.

5744-59-2, 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. 5744-59-2, name is 1,5-Dimethyl-1H-pyrazole-3-carboxylic acid belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below.

Step (e) benzyl 4-(3-(3′-(3-((ls,4s)-4-(l,5-dimethyl-lH-pyrazole-3- carboxamido)cyclohexylcarbamoyl)-5-fluoropyridin-2-yloxy)biphenyl-3- yl)propyl)piperazine-l-carboxylate To a solution of benzyl 4-(3-(3′-(3-((ls,4s)-4-aminocyclohexylcarbamoyl)-5-fluoropyridin-2- yloxy)biphenyl-3-yl)propyl)piperazine-l-carboxylate (0.17 g, 0.26 mmol) and 1,5-dimethyl- lH-pyrazole-3-carboxylic acid (0.036 g, 0.26 mmol) in acetonitrile (2 mL) was added triethylamine (0.356 mL, 2.55 mmol). The initial suspension was left for 10 min to become a solution. 1.57M T3P in THF (0.171 mL, 0.27 mmol) was then added and the mixture stirred for 2 h. The solution was diluted with water and extracted with EtOAc. The organics were combined, dried (MgSO4) and concentrated in vacuo to give the sub-title compound as a white fluffy foam. Yield: 0.18g MS: [M+H]+=788 (MultiMode+)

The synthetic route of 5744-59-2 has been constantly updated, and we look forward to future research findings.

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 31037-02-2 as follows. 31037-02-2

To a stirred solution of step 2 intermediate (4.8 g, 28.37 mmol) in ethanol (28 mL), aqueous solution of potassium hydroxide (2.0 M, 28 mL, 42.555 mmol) was added and the reaction mixture was refluxed for overnight. The reaction mixture was cooled to RT, concentrated under reduced pressure. The residue was stirred in 1.0 N citric acid (80 mL). The solid precipitated was filtered and dried to yield 3.59 g of the titled product. lU NMR (300 MHz DMSO- 6): delta 3.51 (s, 3H), 6.13 (br s, 2H), 7.38 (s, 1H), 11.74 (s, 1H).

According to the analysis of related databases, 31037-02-2, the application of this compound in the production field has become more and more popular.

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. 139756-02-8 name is 4-Amino-1-methyl-3-N-propyl-1H-pyrazole-5-carboxamide, 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. 139756-02-8

To a 250 ml three-necked flask was added 6.52 g of 2-ethoxybenzaldehyde, 1-methyl-3-propyl-4-aminopyrazole-5-methyl Amide 9.6 g and isopropyl alcohol, and the mixture was stirred at room temperature for 3 hours. To the reaction system, oxygen was added to the reaction system, 8.56 g of anhydrous ferric chloride was added and heated at 60 C for 3 hours. Purified water, filtered and dried to

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 4-Amino-1-methyl-3-N-propyl-1H-pyrazole-5-carboxamide, and friends who are interested can also refer to it.

14521-80-3, 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. 14521-80-3 name is 3-Bromo-1H-pyrazole, 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.

Step 1: To 3-bromopyrazole (1.0 g, 6.81 mmol) under ice bathSodium hydrogen (545 mg, 13 ¡¤ 6 mmol, 60%) was added in portions to a solution of tetrahydrofuran (15 mL).And stirring at this temperature for 0.5 hours, followed by dropwise addition of 2-(trimethylsilyl)ethoxymethyl chloride (1.36 g, 8.16 mmol).Stir at room temperature overnight. The reaction was quenched by the addition of water (10 mL).The organic phase was dried over anhydrous sodium sulfate and concentrated.The residue was flash chromatographed (petroleum ether / ethyl acetate = 1/1)Purification afforded 3-bromo-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazole (1.2 g, yield: 64%) it is a yellow oil.

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