Day: August 20, 2021

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. 4522-35-4, name is 3-Iodo-1H-pyrazole, A new synthetic method of this compound is introduced below., HPLC of Formula: C3H3IN2

INTERMEDIATE 10 1 -(4-Fluorophenyl)-3 -iodo- 1 H-pyrazole A mixture of 3-iodo-lH-pyrazole (1 g, 5.16 mmol), (4-fluorophenyl)boronic acid (0.866 g, 6.19 mmol) and [Cu(Cl) (OH)(Me2NCH2CH2NMe2)]2 (0.479 g, 1.031 mmol) in CH2C12 (20.6 mL) was sealed and stirred at 25 C under an atmosphere of oxygen (balloon) overnight. The reaction was filtered over Celite to remove insoluble solids and the filter was washed well with CH2C12. The filtrate was concentrated in vacuo and purified by flash chromatography (ISCO Combiflash, 40 g silica gel column, 0- 10% EtOAc in hexanes) to afford l-(4-fluorophenyl)-3 -iodo- 1 H-pyrazole, as white solid. LCMS calc. = 288.96; found = 288.86 (M+H)+.

The synthetic route of 4522-35-4 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; MERCK SHARP & DOHME CORP.; MOCHIDA PHARMACEUTICAL CO., LTD.; SMITH, Cameron, James; TAN, John, Qiang; ZHANG, Ting; BALKOVEC, James; GREENLEE, William, John; GUO, Liangqin; XU, Jiayi; CHEN, Yi-heng; CHEN, Yili; CHACKALAMANNIL, Samuel; HIRABAYASHI, Tomokazu; NAGASUE, Hiroshi; OGAWA, Kouki; WO2014/120346; (2014); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Synthetic Route of 120068-79-3,Some common heterocyclic compound, 120068-79-3, name is 5-Amino-1-(2,6-dichloro-4-(trifluoromethyl)phenyl)-1H-pyrazole-3-carbonitrile, molecular formula is C11H5Cl2F3N4, 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.

General procedure: A mixture of compound A (5 mmol) and corresponding benzaldehyde (5 mmol) in 10 mL ethanol was refluxed for 24 hours in a reaction flask wrapped up by silver paper. Upon the reactions completed (monitored by TLC), tawny solids were obtained through suction filtration. The precipitates were washed with ethanol (5 mLx3) and recrystallized from ethanol with 50-84% yields.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 5-Amino-1-(2,6-dichloro-4-(trifluoromethyl)phenyl)-1H-pyrazole-3-carbonitrile, its application will become more common.

Reference:
Letter; Li, Guanglong; Zhou, Cong; Zhu, Chengchun; He, Lujue; Li, Xiaoyang; Xu, Zhiping; Xu, Xiaoyong; Shao, Xusheng; Li, Zhong; Cheng, Jiagao; Letters in drug design and discovery; vol. 16; 10; (2019); p. 1175 – 1180;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Reference of 694-48-4, These common heterocyclic compound, 694-48-4, name is 1,3-Dimethyl-1H-pyrazole, 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.

Put 100g (1.04mol, 1eq) of 1,3-dimethylpyrazole into the reaction bottleAnd 800mL water and 400mL ethanol,Add in batches with stirring at room temperature132.1g (0.52mol, 0.5eq) of iodine,Subsequently, 84.8 g (0.624 mol, 0.6 eq) of 25% hydrogen peroxide was added dropwise at 15-20C.Stir at room temperature for 20 hours,Sampling GC to check the remaining material is less than 1%, add 200mL of saturated sodium bisulfite,Distilling ethanol under reduced pressure, cooling to 0, filteringget210.1g of 4-iodine-1,3-dimethyl-1H-pyrazole, GC purity 98.6%,The yield was 91%.

Statistics shows that 1,3-Dimethyl-1H-pyrazole is playing an increasingly important role. we look forward to future research findings about 694-48-4.

Reference:
Patent; Xuzhou Shengyuan Chemical Co., Ltd.; Chen Hong; Yu Wanli; (8 pag.)CN111233768; (2020); A;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Synthetic Route of 129768-28-1, 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 129768-28-1 as follows.

General procedure: To a mixture of D-a (100 mg, 0.46 mmol), acid (0.56 mmol), HATU (262 mg, 0.69 mmol) and N, /V-diisopropylethylamine (118 mg, 0.92 mmol) i n N, A’-d i m e th y 1 fo rm am i dc (3 mL) was stirred at 25 C for 2-24 h. The mixture was diluted by the addition of water, followed by General Work-up Procedure 1. The residue was purified by prep-HPLC or flash column chromatography to afford the desired product. The amide bond formation reaction was carried out in a similar fashion as for 184 using 3-(trifluoromcthyl)- l//-pyrazolc-5-carboxylic acid (61 mg, 0.34 mmol, 1.5 eq.) and D-a (50 mg, 0.23 mmol, 1 eq.) as reactants afforded the title compound (trifluoroacetic acid salt, 63 mg, 56%) as an off-white solid: 1H NMR (500 MHz, DMSO-ri6) 14.58 (d, J = 32.8 Hz, 1H), 10.26 (s, 1H), 8.78 (s, 1H), 7.54 (s, 2H), 7.47 (s, 1H), 7.25 (t, J = 7.8 Hz, 1H), 7.03 – 6.97 (m, 1H), 3.52 (s, 3H), 3.22 (h, J = 6.8 Hz, 1H), 3.12 – 3.02 (m, 2H), 1.25 (d, J = 6.9 Hz, 3H); LCMS: C17H17F3N6O requires: 378, found: m/z = 379 [M+H]+.

According to the analysis of related databases, 129768-28-1, the application of this compound in the production field has become more and more popular.

Reference:
Patent; NURIX THERAPEUTICS, INC.; BARSANTI, Paul A.; BENCE, Neil F.; GOSLING, Jennifa; SAHA, Anjanabha; TAHERBHOY, Asad M.; ZAPF, Christoph W.; BOYLE, Kathleen; CARDOZO, Mario; MIHALIC, Jeffrey; LAWRENZ, Morgan; GALLOP, Mark; BRUFFEY, Jilliane; CUMMINS, Thomas; ROBBINS, Daniel; TANAKA, Hiroko; WANG, Chenbo; COHEN, Frederick; PALMER, Wylie; SANDS, Arthur T.; SHUNATONA, Hunter; (968 pag.)WO2019/148005; (2019); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Synthetic Route of 37687-24-4, These common heterocyclic compound, 37687-24-4, name is Diethyl 3,5-pyrazoledicarboxylate, 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 diethyl 1H-pyrazole-3,5-dicarboxylate (20.0 g, 94.2 mmol) in acetic acid (360 ml) was added dropwise sodium hypochlorite solution (220 ml, 9% in water). After stirring for 6 h at room temperature, the reaction mixture was concentrated under reduced pressure to remove acetic acid, and the remaining mixture was diluted with water (1000 ml). 1.0 M hydrochloric acid was added until pH 4 was reached, and the mixture was extracted with ethyl acetate (3 x 700 ml). The combined organic layers were washed with water and brine, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. Purification of the residue by flash- chromatography on silica gel (eluent: ethyl acetate/petroleum ether 1 :1) afforded the title compound. Yield: 20.0 g (76% of theory, 88% purity). 1H-NMR (300 MHz, DMSO-d6): d [ppm] = 14.93 (br. s, 1H), 4.43-4.30 (m, 4H), 1.39-1.30 (m, 6H).

Statistics shows that Diethyl 3,5-pyrazoledicarboxylate is playing an increasingly important role. we look forward to future research findings about 37687-24-4.

Reference:
Patent; BAYER AKTIENGESELLSCHAFT; BAYER PHARMA AKTIENGESELLSCHAFT; MUeLLER, Steffen; SCHOHE-LOOP, Rudolf; ORTEGA, HERNANDEZ, Nuria; SUeSSMEIER, Frank; JIMENEZ NUNEZ, Eloisa; BRUMBY, Thomas; LINDNER, Niels; GERDES, Christoph; POOK, Elisabeth; BUCHMUeLLER, Anja; GAUGAZ, Fabienne, Zdenka; LANG, Dieter; ZIMMERMANN, Stefanie; EHRMANN, Alexander, Helmut, Michael; GERISCH, Michael; LEHMANN, Lutz; TIMMERMANN, Andreas; SCHAeFER, Martina; SCHMIDT, Georg; SCHLEMMER, Karl-Heinz; FOLLMANN, Markus; KERSTEN, Elisabeth; WANG, Vivian; GAO, Xiang; WANG, Yafeng; (801 pag.)WO2019/219517; (2019); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

These common heterocyclic compound, 16034-46-1, name is 1-Methyl-1H-pyrazole-5-carboxylic acid, 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. Recommanded Product: 1-Methyl-1H-pyrazole-5-carboxylic acid

To a solution of 1-methyl-1H-pyrazole-5-carboxylic acid (compound 4A, 4.58 g, 36.3 mmol), DIEA (13.7 g, 106 mmol) in CH2Cl2 (30 mL) was added EDCI (11.6 g, 60.5 mmol) and DMAP (4.44 g, 36.3 mmol) at -5 C., the mixture was stirred at -5 C. for 30 min. Then methyl 4-amino-3-methylbenzoate (compound 11, 5.00 g, 30.3 mmol) was added, stirred at -5 C. for 30 min. The mixture was warmed to 25 C., stirred for 11 hrs. TLC (petroleum ether:ethyl acetate=1:1, Rf=0.52) showed starting material consumed completely. The mixture was concentrated in vacuum to give light yellow oil. The oil was purified by silica gel column chromatography (petroleum ether:ethyl acetate=90:10 to 50:50) to give methyl 3-methyl-4-(1-methyl-1H-pyrazole-5-carboxamido)benzoate (compound 12, 5.70 g, 69% yield) as light yellow solid.

The synthetic route of 1-Methyl-1H-pyrazole-5-carboxylic acid has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Kyn Therapeutics; Castro, Alfredo C.; Evans, Catherine Anne; (108 pag.)US2019/55218; (2019); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Synthetic Route of 89202-89-1, 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. 89202-89-1 name is 1,4-Dimethyl-1H-pyrazole-3-carboxylic acid, 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.

Example 209 Production of N-[5-({2-[(cyclopropylcarbonyl)amino]imidazo[1,2-b]pyridazin-6-yl}oxy)-2-methylphenyl]-1,4-dimethyl-1H-pyrazole-3-carboxamide Using N-[6-(3-amino-4-methylphenoxy)imidazo[1,2-b]pyridazin-2-yl]cyclopropanecarboxamide (323 mg, 1.0 mmol), 1,4-dimethyl-1H-pyrazole-3-carboxylic acid (154 mg, 1.1 mmol) tetrahydrofuran (2.0 mL), N,N-dimethylformamide (1 drop), thionyl chloride (0.08 mL, 1.1 mmol) and N,N-dimethylacetamide (6.0 mL), and by a reaction in the same manner as in Example 203, the title compound (208 mg, 47%) was obtained as pale-yellow crystals. 1H-NMR (DMSO-d6, 300 MHz) delta 0.75-0.85 (4H, m), 1.85-2.00 (1H, m), 2.20 (3H, s), 2.28 (3H, s), 3.88 (3H, s), 6.95-7.05 (1H, m), 7.02 (1H, d, J=9.6 Hz), 7.30 (1H, d, J=8.7 Hz), 7.63 (1H, s), 7.65-7.70 (1H, m), 7.93 (1H, s), 8.02 (1H, d, J=9.6 Hz), 9.28 (1H, s), 11.06 (1H, s).

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 1,4-Dimethyl-1H-pyrazole-3-carboxylic acid, and friends who are interested can also refer to it.

Reference:
Patent; TAKEDA PHARMACEUTICAL COMPANY LIMITED; US2009/137595; (2009); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

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. 153687-35-5, name is 1-(4-Methoxybenzyl)-1H-pyrazole-4-carbaldehyde, A new synthetic method of this compound is introduced below., Safety of 1-(4-Methoxybenzyl)-1H-pyrazole-4-carbaldehyde

1H-PYRAZOLE-4-CARBALDEHYDE (55). To a solution of 1- (4-METHOXY-BENZYL)-1H- pyrazole (0.21 mol) (Synth. Commun. 1990, 20/18 ; 2849) in dry DMF (235 ml) was added POCL3 (1.5 eq. ) dropwise at room temperature. The mixture was then heated at 95°C for 16 hrs. After cooling to room temperature, the reaction mixture was neutralized by adding ice and saturated sodium carbonate solution. EtOAc (800 ml) was added and the organic layer was separated and washed several times with water. After drying (Na2SO4), the solvent was removed and the crude product was purified over silica gel to give 16.4 g (35percent yield) desired aldehyde 1-(4-METHOXY-BENZYL)-LH- pyrazole-4-carbaldehyde. It was heated with 150 ml TFA for 2 hrs. TFA was evaporated and the basified crude product was purified on silica gel to give 5.3 g of 55.

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:
Patent; IMCLONE SYSTEMS INCORPORATED; WO2005/813; (2005); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Some common heterocyclic compound, 25016-11-9, name is 1-Methyl-1H-pyrazole-4-carbaldehyde, molecular formula is C5H6N2O, 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. name: 1-Methyl-1H-pyrazole-4-carbaldehyde

Step 2) Potassium t-butoxide (23.47 g, 199.1 mmol, 2.44 eq.) was suspended in anhydrous DME (90 mL) and cooled to – 60C. Tosyl methyl isocyanide (23.76 g, 121.7 mmol, 1.49 eq.) was dissolved in anhydrous DME (75 mL) and the solution was added drop- wise to the potassium t-butoxide solution over 20 minutes. After stirring for 20 minutes between – 60 and – 55C, the aldehyde from Step 1 in anhydrous DME (55 mL) was added over 23 minutes. The reaction was stirred for one hour at – 55 to – 50C, and then methanol (90 mL) was added. The cooling bath was removed, and after stirring for 5 minutes in air, the reaction flask was immersed in an oil bath preheated to 85C. The reaction was stirred for 1 hour. After cooling, the mixture was concentrated and the resulting tan solid was dissolved in water (180 mL) with acetic acid (9 mL). This was extracted with ethyl acetate (3 x 250 mL), and these extracts were combined, washed with brine (100 mL), dried over sodium sulfate, filtered and concentrated to yield a brown oil (13.71 g). This oil was dissolved in dichloromethane and purified by silica-gel chromatography using a gradient from 0% to 15% dichloromethane-acetone to yield a bright yellow oil in 63% yield (7.89 g).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 25016-11-9, its application will become more common.

Reference:
Patent; MERCK SHARP & DOHME CORP.; SHUMWAY, Stuart Denham; TONIATTI, Carlo; ROBERTS, Brian Scott; MARTIN, Melissa M.; WO2013/39854; (2013); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Related Products of 3112-31-0,Some common heterocyclic compound, 3112-31-0, name is 1H-Pyrazole-3,5-dicarboxylic acid, molecular formula is C5H4N2O4, 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.

General procedure: The deionized water (3 mL) was slowly dropped over the mixturesolution containing Cu(NO3)23H2O (0.2 mmol, 48 mg) andpyrazine (0.2 mmol, 16 mg) in water and DMF (4 mL, 1:1 v/v) in15 mL of glass vial. Then, the solution of pyrazole-3,5-dicarboxylicacid (0.2 mmol, 35 mg) in deionized water and ethanol (5 mL,1:1 v/v) was carefully layered over the mixture layer. Then, the vialwas sealed and allowed to stand undisturbed at room temperature. The blue crystals of 1 were obtained after 2 days.

The synthetic route of 3112-31-0 has been constantly updated, and we look forward to future research findings.

Reference:
Article; Klongdee, Fatima; Boonmak, Jaursup; Moubaraki, Boujemaa; Murray, Keith S.; Youngme, Sujittra; Polyhedron; vol. 126; (2017); p. 8 – 16;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics