Tag: M.W=200-300

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 116419-94-4 as follows. category: esters-buliding-blocks

Method 23; 4-Bromomethyl-3-trifluoromethyl-benzoic acid methyl esterA suspension of 4-methyl-3-trifluoromethyl-benzoic acid methyl ester (Method 22;0.327 g, 1.5 mmol), iV-bromosuccinimide (267 mg, 1.5 mmol) and benzoyl peroxide (0.15 mmol) in CCl4 (10 ml) was heated to reflux for 3 h. The reaction mixture was cooled to25 C, filtered through a pad of silica gel, and washed with DCM. The organics were removed under reduced pressure and the crude product was purified by column chromatography utilizing an ISCO system (hexanes/EtOAc) to give 252 mg (56.5%). NMR: 7.70-8.25 (m,3H), 4.85 (s, 2H)5 3.91 (s, 3H); m/z 297.

According to the analysis of related databases, 116419-94-4, the application of this compound in the production field has become more and more popular.

Reference:
Patent; ASTRAZENECA AB; ASTRAZENECA UK LIMITED; WO2006/79791; (2006); 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. 1105187-36-7, name is Methyl 3-bromo-4H-thieno[3,2-b]pyrrole-5-carboxylate, A new synthetic method of this compound is introduced below., Computed Properties of C8H6BrNO2S

To a solution of N-chlorosuccinimide (12 mmol) in acetone (25 mL) was added dropwise a solution of sodium iodide (12 mmol) in acetone (80 mL). 3-Bromo-4H-thieno[3,2-b]pyrrole-5-carboxylic acid methyl ester (10 mmol) in acetone (80 mL) was then added portionwise into the reaction mixture. After 1 hr of stirring, the reaction was poured into a solution of Na2SO3 10% and extracted with AcOEt. Organic phases were washed with brine, dried over Na2SO4, filtered, and evaporated. The residue was purified by silica gel chromatography to give compound 69 as a yellowish solid in 68% yield. 1H NMR (CDCl3, 400 MHz) delta (ppm) 3.96 (s, 3H), 7.26 (s, 1H), 9.22 (s, 1H).

The synthetic route of 1105187-36-7 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Idenix Pharmaceuticals, Inc.; US2011/150827; (2011); A1;,
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Synthetic Route of 10203-58-4,Some common heterocyclic compound, 10203-58-4, name is Diethyl isobutylmalonate, molecular formula is C11H20O4, 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.

B. OCP-CO-CH(Bui)-CO2 Et Ethyl 2-(ethoxycarbonyl)-4-(methyl)pentanoate (6 g., 28 mM) was dissolved in ethanol (9 ml.) and 4 N-aqueous sodium hydroxide (7 ml.) was added. The mixture was stirred at ambient temperature for 1 hour and then evaporated. The residue was diluted with water (30 ml.) and the aqueous solution was washed with diethyl ether (3*10 ml.). The combined ethereal washings were backextracted with water (5 ml.). The combined aqueous phases were acidified to pH 3 at 0 C. with citric acid, and the resulting oil was extracted into ethyl acetate (4*20 ml.). The combined extracts were washed with water (2*20 ml.) and dried (MgSO4). The mixture was filtered and the solvent was evaporated to give 2-ethoxycarbonyl-4-methylpentanoic acid as an oil.

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

Reference:
Patent; Imperial Chemical Industries PLC; US4421744; (1983); A;,
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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. 29823-21-0, name is Ethyl 8-Bromooctanoate, This compound has unique chemical properties. The synthetic route is as follows., Recommanded Product: 29823-21-0

EXAMPLE 76 Ethyl 8-(4-phenylimidazol-1-yl)octanoate 4-Phenylimidazole was treated with ethyl 8-bromooctanoate and potassium carbonate in butanone to give after work-up the title compound, m.p. 56-57 C., Found: C, 72.8; H, 8.4; N, 9.0%; C19 H26 N2 O2 Requires: C, 72.6; H, 8.3;N, 8.9%

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 29823-21-0.

Reference:
Patent; SmithKline Beecham Corporation; The Johns Hopkins University; US5648373; (1997); A;,
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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. 110661-91-1, name is tert-Butyl 4-bromobutanoate, A new synthetic method of this compound is introduced below., Quality Control of tert-Butyl 4-bromobutanoate

To a solution of 3-mercapto-5-trifluoromethyl-benzoic acid methyl ester (990 mg, 4.19 mmol) in acetonitrile (25 mL) were added N,N-diisopropylethylamine (1.08 g, 1.46 mL, 8.38 mmol) and tert-butyl 4-bromobutanoate (935 mg, 4.19 mmol, CAS R 110611-91-1). The clear yellow solution was stirred at room temperature for 2.5 hours and then poured on water and ethyl acetate and the layers were separated. The aqueos layer was extracted twice with ethyl acetate. The organic layers were washed with brine, dried over magnesium sulfate, filtered, treated with silica gel and evaporated. The compound was purified by silica gel chromatography on a 50 g column using a MPLC system (CombiFlash Companion, Isco Inc.) eluting with a gradient of n- heptane : ethyl acetate (100 : 0 to 70 : 30). Light yellow liquid (1.27 g, 80%). MS (ESI+): m/z = 379 ([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.

Reference:
Patent; F. HOFFMANN-LA ROCHE AG; DEHMLOW, Henrietta; ERICKSON, Shawn David; MATTEI, Patrizio; RICHTER, Hans; WO2013/149977; (2013); A1;,
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Synthetic Route of 1150566-27-0, 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. 1150566-27-0, name is Ethyl 6-chloroimidazo[1,2-b]pyridazine-3-carboxylate belongs to esters-buliding-blocks compound, it is a common compound, a new synthetic route is introduced below.

Ethyl 6-chloroimidazo[1,2-b]pyridazine-3-carboxylate (600 mg, 2.66 mmol) and 2-(trifluoromethyl)pyrrolidine (1g, 7.19 mmol) were heated in a sealed tube at 173 C for 16h. After cooling to room temperature, water (100 mL) was added. The aqueous layer was extracted with ethyl acetate (2 x 100 mL). Combined organic layers were dried, concentrated and product was purified by column chromatography to afford ethyl 6-(2-(trifluoromethyl)pyrrolidin-1-yl)imidazo[1,2-b]pyridazine-3-carboxylate (270 mg, 30%). MS (ESI) calcd for C14H15F3N4O2 (m/z): 328.1.

The synthetic route of Ethyl 6-chloroimidazo[1,2-b]pyridazine-3-carboxylate has been constantly updated, and we look forward to future research findings.

Reference:
Patent; GlaxoSmithKline LLC; CASAUBON, Rebecca, L.; NARAYAN, Radha; OALMANN, Christopher; VU, Chi, B.; (583 pag.)EP2768509; (2017); B1;,
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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. 40876-98-0, name is Sodium 1,4-diethoxy-1,4-dioxobut-2-en-2-olate, A new synthetic method of this compound is introduced below., Recommanded Product: Sodium 1,4-diethoxy-1,4-dioxobut-2-en-2-olate

A solution of sodium hydroxide (2.85 g, 71.3 mmol) in water (3 ml) was added to a stirred solution of diethyl oxaloacetate sodium salt (8.7 g, 50 mmol) in water (50 ml) and the mixture stirred for 20 minutes. Cyclopropylcarboxamidine hydrochloride salt (5.0 g, 40 mmol) was added to the solution and the mixture was heated at 70 0C overnight, then cooled to ambient temperature and acidified to pH1 by the cautious addition of concentrated hydrochloric acid. The precipitate was isolated by filtration and dried to yield 2-cyclopropyl-4-hydroxypyrimidine-6-carboxylic acid (4.7 g, 63%). Characterising data for the compound are as follows: 1H nmr (400MHz, d6-DMSO) deltaH 13.30 (1H, br s), 12.97 (1H, br s), 6.59 (1H, s), 1.94 (1H, quintet), 1.04 (4H, m) ppm.

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; SYNGENTA LIMITED; WO2009/81112; (2009); A2;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

These common heterocyclic compound, 99548-54-6, name is Methyl 3-bromo-2-methylbenzoate, 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. Product Details of 99548-54-6

To a round-bottomed flask, methyl 3-bromo-2-methylbenzoate (18.3 g, 80 mmol, 1.0 eq), N-bromosuccinimide (17.1 g, 96 mmol, 1.2 eq) and benzoyl peroxide (1.9 g,8.0 mmol, 0.1 eq) were mixed in 150 mL of benzene. The reaction mixture was stirred at 80 C for 12 h. After cooling to room temperature, the reaction mixture was evaporated to remove most of the solvent. The resulting residue was purified by flash column chromatography with hexane/ethyl acetate to give the desired product Si as colorless oil (23.4 g, 95% yield).

The synthetic route of Methyl 3-bromo-2-methylbenzoate has been constantly updated, and we look forward to future research findings.

Reference:
Patent; THE REGENTS OF THE UNIVERSITY OF MICHIGAN; WANG, Shaomeng; HU, Yang; QIN, Chong; XU, Fuming; HU, Jiantao; XIANG, Weiguo; ZHOU, Bing; (233 pag.)WO2018/52949; (2018); A1;,
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Synthetic Route of 99548-55-7, 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. 99548-55-7, name is Methyl 4-bromo-2-methylbenzoate belongs to esters-buliding-blocks compound, it is a common compound, a new synthetic route is introduced below.

Step 2. To a solution of 28 (1.0 g, 4.37 mmol) and NBS (0.93 g, 5.24 mmol) in CC14 (10 mL) was added BPO (106 mg, 0.44.00 mmol). The reaction mixture was stirred at 80C for 5 h. Upon completion, the reaction was quenched with H20 (10 mL) and extracted with ethyl acetate (3 x 20 mL). The the organic layer was washed with H20 (3 x 10 mL), concentrated, and purified by prep-TLC (petroleum : ethyl acetate = 20: 1) to afford 29 (610 mg, 41%).

The synthetic route of Methyl 4-bromo-2-methylbenzoate has been constantly updated, and we look forward to future research findings.

Reference:
Patent; NUMERATE, INC.; RAIMUNDO, Brian; KOLTUN, Elena S.; GRIFFIN, John; STANGELAND, Eric; (50 pag.)WO2018/49328; (2018); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

773134-11-5, name is Methyl 4-bromo-2,6-difluorobenzoate, belongs to esters-buliding-blocks compound, is considered to be a conventional heterocyclic compound, which is widely used in drug synthesis. The chemical synthesis route is as follows. category: esters-buliding-blocks

Methyl 4-bromo-2,6-difluorobenzoate (Intermediate 5a, 502 mg, 2 mmol) was dissolved in A/,N-dimethylformamide (5 mL) and triethylamine (1 .59 mL, 10 mmol). The solution was purged with nitrogen for 5 min and copper(l)iodide (19 mg, 0.1 mmol) and bis(triphenylphosphine)palladium(ll)chloride (70.2 mg, 0.1 mmol) were added. The mixture was stirred for 5 min after which cyclohexylacetylene (1.29 mL, 10 mmol) was added and the reaction mixture was stirred at 80 C for 2 h. The reaction mixture was added to a stirred mixture of water/brine/ethyl acetate = 1/1/1 v/v% (45 mL). The organic layer was separated, washed with water, brine, dried over sodium sulfate, filtered and concentrated under reduced pressure. The crude residue was purified by column chromatography (heptane/ethyl acetate = 95/5 v/v%) to afford 360 mg of the title compound (yield: 64.7%).

The synthetic route of 773134-11-5 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; NETHERLANDS TRANSLATIONAL RESEARCH CENTER B.V.; DE MAN, Adrianus Petrus Antonius; UITDEHAAG, Joost Cornelis Marinus; STERRENBURG, Jan Gerard; DE WIT, Joeri Johannes Petrus; VAN CAUTER, Freek; SEEGERS, Nicole Wilhelmina Cornelia; VAN DOORNMALEN, Antonius Maria; BUIJSMAN, Rogier Christian; ZAMAN, Guido Jenny Rudolf; (89 pag.)WO2019/43103; (2019); A1;,
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