Category: esters-buliding-blocks

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. 653-92-9, name is Methyl 2-bromo-4-fluorobenzoate, A new synthetic method of this compound is introduced below., Safety of Methyl 2-bromo-4-fluorobenzoate

EXAMPLE 18AMETHYL 4-FLUORO-2-PHENETHYLBENZOATEMethyl 2-bromo-4-fluorobenzoate (1.00 g), (E)-styrylboronic acid (0.89 g), tetrakis(triphenylphosphine)palladium(0) (0.50 g), and K3PO4 (2.28 g) were stirred in dioxane (17 mL) at 90 C. for 24 hours. The reaction mixture was chromatographed on silica gel with 1-5% ethyl acetate/hexanes. The product in methanol (10 ml) was added to 20 wt % of fresh dry 5% Pd-C and stirred 4 days with H2 in a pressure bottle. The mixture was filtered through a nylon membrane and concentrated.

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; ABBOTT LABORATORIES; US2010/184750; (2010); A1;,
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Synthetic Route of 51175-79-2,Some common heterocyclic compound, 51175-79-2, name is Methyl 1-bromocyclobutanecarboxylate, molecular formula is C6H9BrO2, 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.

Example 46; Preparation of intermediate l-(4-chloro-2-formyl-phenoxy)-cyc Io butanecarboxylic acid methyl ester; M.W. 268.70 C13H13C1O4A mixture of 5-chloro-2-hydroxy-benzaldehyde (10 g, 64 mmol), 1-bromo- cyclobutanecarboxylic acid methyl ester (15 g, 77 mmol), K2CO3 (13 g, 94 mmol) in DMF (100 mL) was heated at 140 0C for 1.5 h. Then the mixture was partitioned between ethyl acetate and water, the organic layer was washed with water 4 times, dried over anhydrous Na2SO4, concentrated to give crude product as dark oil (18 g ).

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route Methyl 1-bromocyclobutanecarboxylate, its application will become more common.

Reference:
Patent; F. HOFFMANN-LA ROCHE AG; CHEN, Li; HAN, Xingchun; YANG, Song; ZHANG, Zhuming; WO2010/121995; (2010); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Electric Literature of 27741-65-7, A common heterocyclic compound, 27741-65-7, name is Ethyl 2-cyclobutylideneacetate, molecular formula is C8H12O2, 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.

General procedure: In a 5 mL microwave vial containing alpha,beta-unsaturated ethyl ester (100mg, 1.00equiv), boronic ester (2.00 equiv), potassium carbonate (2.00 equiv) and [RhOH(COD)]2 (0.05 equiv) was added 2% wt. TPGS-750-M solution in water (3 mL). The mixture was stirred vigorously at ambient temperature for the indicated time. The reaction mixture was then extracted with ethyl acetate. The organic phase was subsequently dried over MgSO4, filtrated and reduced under vacuum. The crude product was purified by column chromatography on silica (eluent: 0-10% methanol in dichloromethane) to yield the desired product.

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; Linsenmeier, Anna M.; Braje, Wilfried M.; Tetrahedron; vol. 71; 38; (2015); p. 6913 – 6919;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Application of 2475-80-1, 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. 2475-80-1, name is Methyl 2-amino-5-methoxybenzoate, This compound has unique chemical properties. The synthetic route is as follows.

Methyl 2-amino-5- (methyloxy) benzoate (20.22 g, 0.112 mol) was dissolved in toluene in a 500 mL single neck flask,Triethylamine (22.58 g, 0.223 mol) was addedIsopropylsulfamoyl chloride (16.82 g, 0.117 mol),80 reaction 1h.The reaction was completed, extracted with water, the organic phase was collected, the aqueous phase was extracted with ethyl acetate, the combined organic phase was washed with saturated sodium bicarbonate,And dried over anhydrous sodium sulfate,The solvent was distilled off under reduced pressure to give 29.50 g of methyl 5- (methyloxy) -2 – ((N-isopropylsulfonyl) amino) benzoate in a yield of 91.7%.

The chemical industry reduces the impact on the environment during synthesis Methyl 2-amino-5-methoxybenzoate. I believe this compound will play a more active role in future production and life.

Reference:
Patent; Guizhou University; Yue Yi; Zhao Chunshen; Zhou Zhixu; Liu Li; Huang Zhuyan; Teng Minggang; (14 pag.)CN106478548; (2017); A;,
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Ester – an overview | ScienceDirect Topics

Synthetic Route of 7424-91-1, These common heterocyclic compound, 7424-91-1, name is Methyl 3,3-dimethoxypropanoate, 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.

Example 4: Preparation of methyl 3-methoxyprop-2-enoate The reaction was carried out analogously to example 2 using 5 g (content 99percent, 34 mmol) of pure-distilled methyl 3,3-dimethoxypropionate and 47 mg (0.27 mmol) of sulfanilic acid (Fluka). The resulting crude product had a content of 92percent (GC) of methyl 3-methoxyprop-2- enoate.

Statistics shows that Methyl 3,3-dimethoxypropanoate is playing an increasingly important role. we look forward to future research findings about 7424-91-1.

Reference:
Patent; LONZA AG; WO2009/56293; (2009); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

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. 36692-49-6, name is Methyl 3,4-diaminobenzoate, This compound has unique chemical properties. The synthetic route is as follows., category: esters-buliding-blocks

In a similar manner as described in [1], a solution of amine 2 (1.46 g, 4.20 mmol) in 15 mL MeCN (abs.) was added dropwise at 0 C to a solution of 1,1?-thiocarbonyl diimidazole (1.12 g, 6.30 mmol) and imidazole (94 mg, 1.39 mmol) in 25 mL MeCN (abs.). The reaction mixture was stirred for 1 h at rt. Methyl 3,4-diaminobenzoic acid (1.05 g, 6.30 mmol) was dissolved in 10 mL MeCN (abs.) and added dropwise to the reaction mixture. The solution was stirred for 4 h at 50 C and at rt overnight. The solvent was evaporated at low pressure and the residue purified by column chromatography (n-hexane/ethylacetate 1:1 ? ethyl acetate), yielding 1.83 g (79%) of the product compound as ayellow foam.

According to the analysis of related databases, 36692-49-6, the application of this compound in the production field has become more and more popular.

Reference:
Article; Danneberg, Friederike; Ghidini, Alice; Dogandzhiyski, Plamena; Kalden, Elisabeth; Stroemberg, Roger; Goebel, Michael W.; Beilstein Journal of Organic Chemistry; vol. 11; (2015); p. 493 – 498;,
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Synthetic Route of 6091-64-1, The chemical industry reduces the impact on the environment during synthesis 6091-64-1, name is Ethyl 2-bromobenzoate, I believe this compound will play a more active role in future production and life.

A mixture of bromide 2-bromo-benzoic acid ethyl ester (19.3 g, 84 mmol), 2,5-bis-tributylstannanyl-thieno[3,2-b]thiophene (20.2 g, 28 mmol) and anhydrous N,N-dimethylformamide (200 cm3) is degassed by nitrogen for 30 minutes. To the mixture is added bis(triphenylphosphine) palladium(II) chloride (990 mg, 1.4 mmol) and the mixture further degassed for 5 The mixture is then heated at 100 C. for 17 hours. After cooling, the mixture is poured into water (500 cm3), extracted with dichloromethane (3×300 cm3) and the combined organics dried over anhydrous magnesium sulfate, filtered and the solvent removed in vacuo. The crude product is purified by column chromatography (gradient from 40-60 petrol to dichloromethane) to give 1,1?-diethyl ester 2,2?-thieno[3,2-b]thiophene-2,5-diylbis-benzoic acid (9.44 g, 76%). MS (m/e): 436 (M+, 100%).

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:
Patent; MERCK PATENT GMBH; Mitchell, William; D’Lavari, Mansoor; Wang, Changsheng; Tierney, Steven; Sparrowe, David; (59 pag.)US9695190; (2017); B2;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Adding a certain compound to certain chemical reactions, such as: 1190-39-2, name is malonic acid dibutyl ester, 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 1190-39-2, Formula: C11H20O4

General procedure: According to the literature procedure,10e a 250 mL, two-necked, round-bottomed flask was charged with diethyl malonate (40.0 mmol), water (40.0 mmol), and ethanol (45 mL), the mixture was stirred in 40 C oil bath for 2 h. After that, a solution of potassium tert-butoxide (40.0 mmol) in ethanol (45 mL) was added slowly over 30 min. After completion of addition, the reaction mixture was stirred in 40 C oil bath until consumption of the starting material (monitored by GC analysis). After removing the ethanol solvent by slow evaporation on rotary evaporator, 20 ml diethyl ether was added. The resulting solid was collected by filtration, washed sequentially with 1:1 mixture of diethyl ether and ethanol (5 mL×2) and diethyl ether (10 mL×3), transferred to a round-bottomed flask and dried under vacuum at 50 C for 10 h to provide ethyl potassium malonate in 85% yield.

At the same time, in my other blogs, there are other synthetic methods of this type of compound, malonic acid dibutyl ester, and friends who are interested can also refer to it.

Reference:
Article; Feng, Yi-Si; Wu, Wei; Xu, Zhong-Qiu; Li, Yan; Li, Ming; Xu, Hua-Jian; Tetrahedron; vol. 68; 9; (2012); p. 2113 – 2120;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

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. 106-65-0, name is Dimethyl succinate, This compound has unique chemical properties. The synthetic route is as follows., name: Dimethyl succinate

Tert-amylalcohol (50 mL), sodium (1.00 g, 43.50 mmol), and catalytic amount of ferricchloride (5 mg) were added to a three-neck round-bottom flask. The mixture washeated at 145 C under reflux until sodium was completely dissolved.Thiophene-2-carbonitrile (1.40 mL, 15.03 mmol) was added and dimethyl succinate(0,92 mL, 7,03 mmol) was added dropwise during 30 minutes. The reaction mixturewas further heated at 145 C under reflux for 2 hours, cooled to 25 C, whereuponmethanol (40 mL) and hydrochloric acid (5 mL, 35%) were added. The resulting darkred precipitate was filtered off and washed with methanol several times.

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 106-65-0.

Reference:
Article; Podlesny, Jan; Dokladalova, Lenka; Pytela, Oldrich; Urbanec, Adam; Klikar, Milan; Almonasy, Numan; Mikysek, Toma?; Jedryka, Jaroslav; Kityk, Iwan V.; Bure?, Filip; Beilstein Journal of Organic Chemistry; vol. 13; (2017); p. 2374 – 2384;,
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. 927-68-4, name is 2-Bromoethyl acetate belongs to esters-buliding-blocks compound, it is a common compound, a new synthetic route is introduced below. HPLC of Formula: C4H7BrO2

500 mg of the resulting product 6,7-dihydroxy-4- anilinoquinazoline obtained in step 5 of Embodiment 9 was added with 903 mg of 2-bromoethyl acetate, 1.24 g of anhydrous potassium carbonate, 150mg of potassium iodide and 10 ml of dry DMF. The system was reacted overnight at 50C. and followed by TLC until the reaction finished. The reaction solution was diluted with water, extracted with ethyl acetate, washed with saturated sodium chloride solution, dried with anhydrous sodium sulfate and concentrated in vacuum. The crude product was directly put into the next step of reaction without separation.10178] The crude product was dissolved in 20 ml of methanol and then added with 500 mg of KOH. The system was reacted overnight at room temperature and followed by TLC until the reaction finished. The reaction solution was directly concentrated in vacuum and separated by column chromatography to obtain 520 mg of the resulting product 2,2?-(4-(3- ethynylaniline)quinazoline-6,7-diene) di(oxy)diethanol(79%).j0179] ESI mlz 366.0 (M+H)

The synthetic route of 927-68-4 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences; Zhang, Yanmei; Ding, Ke; Liao, Jinxi; Wang, Yican; Chen, Panyu; (27 pag.)US2016/175453; (2016); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics