Month: March 2021

Reference of 3618-04-0,Some common heterocyclic compound, 3618-04-0, name is trans-Ethyl 4-hydroxycyclohexanecarboxylate, molecular formula is C9H16O3, 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.

Chloro(1 ,1-dimethylethyl)dimethylsilane (115g; 0.76mol) was added in portions over 1 hour to a solution of ethyl 4-hydroxycyclohexanecarboxylate (118g; 0.68mol), imidazole(103g; 1.52mol) and dimethylformamide (400ml) stirred under an atmosphere of argon. A small exotherm was observed resulting in the reaction mixture temperature increasing to~40C. The mixture was stirred at room temperature overnight then poured into 10% citric acid solution (2L) and extracted with diethyl ether (2 x 800ml). The ether extracts were washed with water, brine and then dried (Na2SO4) and the solvent was removed to give the title compound as a oil (198.4g) 1H NMR delta (CDCI3, 400 MHz): 0.01 (6H, m), 0.85 (9H, s), 1.2 (3H, m), 1.3-1.5 (2H, m), 1.6 (2H, m), 1.85-2 (3H, m), 2.15-2.3 (1 H, m) 3.5 (0.4H, m) 3.86 (1 H, m) 4.1 (1 H, m).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route trans-Ethyl 4-hydroxycyclohexanecarboxylate, its application will become more common.

Reference:
Patent; GLAXO GROUP LIMITED; WO2007/107565; (2007); A1;,
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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 206551-41-9 as follows. Application In Synthesis of Methyl 3-bromo-2-fluorobenzoate

Methyl 3-bromo-2-fluorobenzoate (500 mg, 2.15 mmol) dissolved in diethyl ether (15 mL) was cooled to 0 ¡ãC and treated with lithium aluminum hydride (81 mg, 2.13 mmol). The reaction mixture was slowly warmed to room temperature and stirred for 6h. The reaction mixture was againcooled to 0 ¡ãC and methanol was added dropwise slowly followed by water. The reaction mixture wasdiluted with ethyl acetate and washed with water. The organic layer was concentrated to give (3-bromo- 2-fluorophenyl)methanol.

According to the analysis of related databases, 206551-41-9, the application of this compound in the production field has become more and more popular.

Reference:
Patent; GILEAD SCIENCES, INC.; AKTOUDIANAKIS, Evangelos; APPLEBY, Todd; CHO, Aesop; DU, Zhimin; GRAUPE, Michael; GUERRERO, Juan A.; JABRI, Salman Y.; LAD, Lateshkumar Thakorlal; MACHICAO TELLO, Paulo A.; MEDLEY, Jonathan William; METOBO, Samuel E.; MUKHERJEE, Prasenjit Kumar; NADUTHAMBI, Devan; NOTTE, Gregory; PARKHILL, Eric Q.; PHILLIPS, Barton W.; SIMONOVICH, Scott Preston; SQUIRES, Neil H.; VENKATARAMANI, Chandrasekar; WANG, Peiyuan; WATKINS, William J.; XU, Jie; YANG, Kin Shing; ZIEBENHAUS, Christopher Allen; (724 pag.)WO2018/195321; (2018); A1;,
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Application of 144267-96-9, 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. 144267-96-9, name is Ethyl 3,4-difluorobenzoate, This compound has unique chemical properties. The synthetic route is as follows.

To a solution of ethyl 3,4-difluorobenzoate (1 .5 g) in N,N-dimethylformannide (15 mL) 1 ,2,4-triazole (1 .1 g) and K2CO3 (2.3 g) are added and the mixture is heated at 150 C in a microwave for 30 min. After cooling, water and ethyl acetate are added and the organic layer is dried over MgSO4 and concentrated. The residue is purified by chromatography on silica gel eluting with 0% to 100% ethyl acetate/hexane. The pure ester is dissolved in methanol (30 mL) and 4 M aqueous NaOH solution (3 mL) is added and the mixture is stirred at room temperature for 1 h. The mixture is neutralized with 6 M hydrochloric acid, concentrated, and then acidified with 6 M hydrochloric acid, and the precipitate is filtered off washing with a small amount of water and dried by suction to give the acid as a white solid.

The chemical industry reduces the impact on the environment during synthesis Ethyl 3,4-difluorobenzoate. I believe this compound will play a more active role in future production and life.

Reference:
Patent; BOEHRINGER INGELHEIM INTERNATIONAL GMBH; NEUROCRINE BIOSCIENCES, INC.; NOSSE, Bernd; BLUM, Andreas; HECKEL, Armin; HIMMELSBACH, Frank; ASHWEEK, Neil J.; HARRIOTT, Nicole; WO2014/37327; (2014); A1;,
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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. 185312-82-7, name is Methyl 4-bromo-2-chlorobenzoate, A new synthetic method of this compound is introduced below., Quality Control of Methyl 4-bromo-2-chlorobenzoate

Step A. 2-Chloro-4-(3-dimethylaminopropyl-1-yl)-benzoic acid methyl ester Under an atmosphere of nitrogen, a mixture of 4-bromo-2-chlorobenzoic acid methyl ester (25.13 g, 101 mmol), 1-dimethylamino-2-propyne (16 mL, 150 mmol), bis(triphenylphosphine)palladium(II) chloride (1.0 g) and copper (I) iodide (0.15 g) in 100 mL of triethylamine was heated at 60 C. for 2 hours. The cooled reaction mixture was filtered through Solka floc and the cake was washed with ethyl acetate. The filtrate was partitioned between ethyl acetate and dilute aqueous sodium thiosulfate. The organic layer was washed with water, brine and dried over sodium sulfate. The dark solution was filtered through a plug of Merck-60 silica gel and the filtrate was concentrated in vacuo to give the title compound (23.8 g, 95%) as an orange oil, which was used as such in the next step. NMR (DMSO-d6, 300 MHz): delta 2.25 (s, 6H, NCH3), 3.475 (s, 2H, CCH2N), 3.84 (s, 3H, OCH3), 7.5 (dd, 1H), 7.62 (s, 1H), 7.8 (d, 1H).

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; American Home Products Corporation; US6194407; (2001); B1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

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. 2876-78-0, name is Methyl 1-Naphthaleneacetate belongs to esters-buliding-blocks compound, it is a common compound, a new synthetic route is introduced below. Application In Synthesis of Methyl 1-Naphthaleneacetate

Triflic anhydride (16.6 mL, 0.099 mmol) was added dropwise to a solution of diphenylsulfoxide (10.0 g, 49.4 mmol) and methyl 2-(naphthalen-1-yl)acetate (10.9 g, 54.5 mmol) in DCM (100 mL) at -78 C. and stirred for 3 h. The reaction was quenched by the slow addition of water (50 mL) and slowly warmed to r.t. The layers were separated and the organic layer washed with 2M aqueous sodium iodide (10¡Á100 mL), and water (3¡Á100 mL), then concentrated to a viscous oil which was precipitated from MTBE (600 mL) to afford the title compound (18.7 g, 74%) as a light brown hydroscopic solid. 1H NMR (500 MHz, (CD3)2CO) delta: 8.48-8.51 (m, 1H), 8.30-8.33 (m, 1H), 8.03-8.10 (m, 3H), 7.75-7.99 (m, 8H), 7.72 (d, J=8 Hz, 1H), 4.39 (s, 2H), 3.68 (s, 3H).

The synthetic route of 2876-78-0 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Rohm and Haas Electronic Materials, LLC; LaBeaume, Paul J.; (24 pag.)US9304394; (2016); B2;,
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Synthetic Route of 294190-18-4, The chemical industry reduces the impact on the environment during synthesis 294190-18-4, name is Methyl 3-amino-5-chloro-2-methylbenzoate, I believe this compound will play a more active role in future production and life.

Step 1 : Synthesis of methyl 3-(((trans)-4-((tert-butoxycarbonyl) amino) cyclohexyl) amino)-5-chloro-2-methylbenzoate: [0910] To a stirred solution of methyl 3-amino-5-chloro-2-methylbenzoate (100 g, 502 mmol) and tert-butyl (4-oxocyclohexyl) carbamate (160.5 g, 753 mmol) in dichloroethane (1 L), acetic acid (180.9 g, 3015 mmol) was added and the reaction was stirred at rt for 30 min. Then sodium triacetoxyborohydride (319.5 g, 1507 mmol) was added at 0 C and the reaction was stirred at rt for 16 h. The progress of the reaction was monitored by TLC. Upon completion; the reaction was quenched with aqueous sodium bicarbonate, the organic layer was separated and the aqueous layer was extracted with dichloromethane. The combined organic layers were dried over anhydrous sodium sulphate and concentrated under reduced pressure. The crude compound was purified by silica gel column chromatography (100-200 mesh size) eluting with 2, 4, 6 & 8% ethyl acetate in hexane to remove maximum cis isomer. This afforded 120 g of mixture of cis and trans isomers (40:60 by HPLC). The trans isomer was purified by repetitive recrystazlisation with ethyl acetate: hexane (1 :2) to afford 65 g of pure trans isomer (65 g, 33%).

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, Methyl 3-amino-5-chloro-2-methylbenzoate, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; EPIZYME, INC.; CAMPBELL, John Emmerson; WO2015/10049; (2015); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

These common heterocyclic compound, 144267-96-9, name is Ethyl 3,4-difluorobenzoate, 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: Ethyl 3,4-difluorobenzoate

Cesium carbonate (8.3 g, 25.4 mmol) was added to a mixture of 3-hydroxy-5-{[(1S)-2- hydroxy- 1 -methylethyl]o’xy) -N-( I -methyl- lH-pyrazol-3-yl)benzamide (3.7 g, 12.7 mmol) and ethyl-3,4-difluorobenzoate (2.36 g, 12.7 mmol) in dimethylacetamide (60 mL) and the stirred mixture heated at 115C for 3 hours. The mixture was allowed to cool to RT and ethyl acetate (100 mL) added. The mixture was washed with water (5 x 40 mL), brine (40 mL), dried (MgS04), filtered, and reduced in vacuo. The residue was chromatographed on silica, eluting with 50% ethyl acetate in isohexane, to give the desired compound (1.8 g). ?H NMR No. (CDC13): 1.31 (d, 3H), 1.41 (t, 3H), 3.72 (d, 2H), 3.83 (s, 3H), 4:39 (q, 2H), 4.57 (sex, 1H), 6.75 (m, 1H), 6.83 (m, 1H), 7.09 (m, 2H), 7.30 (d, 2H), 7.83 (m, 2H), 8.91 (brs, 1H). m/z 458(M+H)+

The synthetic route of Ethyl 3,4-difluorobenzoate has been constantly updated, and we look forward to future research findings.

Reference:
Patent; ASTRAZENECA AB; ASTRAZENECA UK LIMITED; WO2005/121110; (2005); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Adding a certain compound to certain chemical reactions, such as: 6091-64-1, name is Ethyl 2-bromobenzoate, belongs to esters-buliding-blocks 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 6091-64-1, COA of Formula: C9H9BrO2

General procedure: In a 10 mL schlenk tube with magnetic stirring bar, cercosporin(0.05 equiv), aryl halide 1 (0.2 mmol), arene 2 (20 equiv), DIPEA (4equiv) were dissolved in CH3CN (2 mL) and the resulting mixtures were placed under 23WCFL under N2 atmosphere. When the reaction was finished, the reaction mixture was washed with brine. The aqueous phase was reextracted with ethyl acetate. The combined organic extracts were dried over Na2SO4, concentrated in vacuum,and the resulting residue was purified by silica gel column chromatographyto afford the desired product 3.

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 2-bromobenzoate, other downstream synthetic routes, hurry up and to see.

Reference:
Article; Tang, Zhaocheng; Li, Jia; Lin, Fulin; Bao, Wenhao; Zhang, Shiwei; Guo, Baodang; Huang, Shuping; Zhang, Yan; Rao, Yijian; Journal of Catalysis; vol. 380; (2019); p. 1 – 8;,
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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. 2905-54-6, name is Methyl 2,3-dichlorobenzoate, A new synthetic method of this compound is introduced below., category: esters-buliding-blocks

General procedure: In a fume hood, an oven dried Schlenk flask equipped with a magnetic stirring bar was filled with N2 and evacuated (three cycles). Under N2 atmosphere [Ir(OMe)(COD)]2 (13.3 mg, 0.01 mmol, 1 mol%), 4,4-ditert-butyl-2,2?-bipyridyl (10.7 mg, 0.02 mmol, 2 mol%), and pinacolborane (HBPin) (436 muL, 384 mg, 3 mmol, 1.5 equiv) were added. The appropriate arene substrate (2 mmol, 1 equiv) was added via micropipette under N2 atmosphere. The Schlenk flask was closed and the reaction mixture was heated at 80 C in an oil bath. The progress of reaction was monitored by GC-MS and TLC. Upon completion of reaction, Schlenk flask was cooled to r.t. and exposed to air. The contents of the flask were dissolved in CH2Cl2 (3-5 mL) and taken out in a round-bottomed flask. The volatile organics were removed under reduced pressure using a rotary evaporator. The crude product was purified by column chromatography (silica gel, hexanes-CH2Cl2 1:1).

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:
Article; Shahzadi, Tayyaba; Saleem, Rahman S. Z.; Chotana, Ghayoor A.; Synthesis; vol. 50; 21; (2018); p. 4336 – 4342;,
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Electric Literature of 443-26-5, These common heterocyclic compound, 443-26-5, name is Ethyl 2-fluorobenzoate, 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.

O-fluorobenzoic acid (5g, 35.7mmol) was dissolved in 20mL of ethanol, a catalytic amount of concentrated sulfuric acid was added dropwise, and the mixture was stirred at reflux overnight. After the reaction was completed, the ethanol was rotated.Extracted with ethyl acetate (25 mL ¡Á 3),The organic phase is combined, washed with saturated sodium hydrogen carbonate solution, washed with saturated brine and dried over anhydrous sodium sulfate.Concentrated to give a colorless oily productEthyl fluorobenzoate 4.9g;Ethyl fluorobenzoate (4.9 g, 29.1 mmol) was dissolved in 20 mL of DMSO, and morpholine (12.7 mL, 145.7 mmol) was added dropwise and stirred at 120 overnight.After the reaction, ethyl acetate was extracted (25 mL¡Á3), and the organic phase was combined, washed with water (25 mL¡Á3),After concentration, the oily product was 4.5 g;The above product (4.5 g, 19.1 mmol) was dissolved in 10 mL of methanol.Add 10 mL of 10% aqueous NaOH solution.After stirring at 80 C for 2 h, the methanol was rotated, and the pH was adjusted to 4 with 10% dilute hydrochloric acid.Solid precipitated and filtered to obtain 3.2 g of 2-morpholinylbenzoic acid.Three-step yield of 43.2%;The o-fluorobenzoic acid (50 mg, 0.24 mmol) was obtained in the same manner as in Example 1 to obtain 45g, two-step yield 54.9%of the product.

The synthetic route of 443-26-5 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; China Pharmaceutical University; Xu Jinyi; Li Wenlong; Xu Shengtao; Shuai Wen; Xu Feijie; Sun Honghao; Ma Cong; Zhu Zheying; Yao Hong; (35 pag.)CN109678815; (2019); A;,
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