Category: esters-buliding-blocks

Adding a certain compound to certain chemical reactions, such as: 37746-78-4, name is (E)-Ethyl 4-bromobut-2-enoate, 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 37746-78-4, Application In Synthesis of (E)-Ethyl 4-bromobut-2-enoate

E)-ethyl 4-aminobut-2-enoate Procedure: (E)-ethyl 4-bromobut-2-enoate (1.0 g, 5.18 mmol, 1.0 eq.) in water (10 mL) was added aqueous ammonia solution (10 mL). The reaction was stirred at room temperature for 12 hours, and concentrated to give the title compound (0.7 g, yield: 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, (E)-Ethyl 4-bromobut-2-enoate, other downstream synthetic routes, hurry up and to see.

Reference:
Patent; Zhejiang DTRM Biopharma Co. Ltd.; He, Wei; (167 pag.)US2016/200730; (2016); A1;,
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145576-28-9, name is Ethyl 4-methylenecyclohexanecarboxylate, 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

Preparation of 4-Methoxy-4-methylcyclohexanecarboxylic acid; A suspension of Hg(OAc)2 (2.2 g, 6.96 mmol) in dry methanol (15 mL) was cooled to O0C under stirring, 4-Methylenecyclohexanecarboxylic acid ethyl ester (0.9 g, 5.36 mmol) was added and maintained for 15 min. To the resulted reaction mixture, 3M NaOH (12 mL) was added followed by the addition of a mixture of NaBH4 solution in 3M NaOH solution (12 mL) and maintained for 10 min. The reaction mixture was allowed to rt and maintained for 1h additionally. The reaction mass was filtered through celite bed, the filtrate was cooled, acidified and then was extracted with DCM (100 mL). The organic layer was washed with water (2 x 50 mL), brine solution (50 mL), dried over anhydrous sodium sulfate and concentrated to obtain the crude product. The crude was purified by column chromatography over silica gel column using 10% EtOAc in pet ether as eluting solvent to obtain the pure product (2) as liquid (500 mg, 55%). 1HNMR(CDCl3)-. delta 3.22(s, 1H), 3.15(s, 3H), 2.18-2.36(m, 1H), 1.9(d, 2H)1 1.5-1.82(m, 5H), 1.2-1.32(m, 2H) and 1.1 (s, 3H). Mass: (M-1) 171 calculated for C9H15O3.

The synthetic route of 145576-28-9 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; PFIZER PRODUCTS INC.; WO2008/84300; (2008); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Application of 4224-69-5, A common heterocyclic compound, 4224-69-5, name is Methyl 2-(bromomethyl)acrylate, molecular formula is C5H7BrO2, 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: Methylcis-4-hydroxy-2-methylene-3,4-diphenylbutanoate2: Starting material (8.583 g, 33.64mmol, 1.0 eq.) was weighed out in a 250 mL round bottom flask. To it was addedTHF (50 mL, 0.66 M), H2O (33.6 mL, 1.0 M), and benzaldehyde (5.14mL, 50.47 mmol, 1.5 eq.). Finally indiumpowder (5.02 g, 43.74 mmol, 1.3 eq.) was added and the reaction mixture wascapped to prevent solvent evaporation and stirred overnight (17 h). TLCanalysis was used to verify completion of the reaction. Upon completion, the reaction mixture wastransferred into a separatory funnel with Et2O (100 mL) and H2O(100 mL). If an emulsion formed, 1M HClwas added until the emulsion broke up. Afterseparation of the layers, the aqueous layer was extracted with Et2O(2 x 100 mL). The combined organic layers were washed with brine (100 mL) anddried over MgSO4. Evaporationof solvent en vacuo followed bycolumn chromatography over silica gel (SiO2) yielded the desired productas a viscous clear oil (8.575 g, 30.37 mmol, 90.3 %).

The synthetic route of 4224-69-5 has been constantly updated, and we look forward to future research findings.

Reference:
Article; Ramachandran, P. Veeraraghavan; Helppi, Matthew A.; Lehmkuhler, Arlie L.; Marchi, Jennifer M.; Schmidt, C. Max; Yip-Schneider, Michele T.; Bioorganic and Medicinal Chemistry Letters; vol. 25; 19; (2015); p. 4270 – 4273;,
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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. 64123-77-9, name is Methyl 2-(3-fluorophenyl)acetate belongs to esters-buliding-blocks compound, it is a common compound, a new synthetic route is introduced below. Formula: C9H9FO2

Methyl 2-(3-fluorophenyl)acetate (1.90 g, 11.3 mmol) and N-bromo succinimide (2.01 g, 11.3 mmol) are dissolved in CCl4 (80 mL). HBr (64 ul, 0.56 mmol) is added and the mixture is stirred under reflux overnight. The mixture is cooled at RT, diluted with DCM and washed with sat. NaHCO3, water and brine.The organic layer is dried (Na2SO4), filtered and evaporated obtaining intermediate 1144 as a yellow oil (2.68 g, 96% yield).

The synthetic route of 64123-77-9 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; CHIESI FARMACEUTICI S.P.A.; CALIGIURI, Antonio; RICCABONI, Mauro; AMARI, Gabriele; WO2010/72338; (2010); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Electric Literature of 18013-97-3, These common heterocyclic compound, 18013-97-3, name is Diethyl 2,5-dibromoterephthalate, 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.

The inventive diindenothiophene derivatives can be produced by any of the methods that are conventionally known to persons having ordinary skill in the art. For instance, the above-mentioned compound of formula (2) can be prepared by a method comprising the following steps:

Statistics shows that Diethyl 2,5-dibromoterephthalate is playing an increasingly important role. we look forward to future research findings about 18013-97-3.

Reference:
Patent; ETERNAL CHEMICAL CO., LTD.; US2010/168444; (2010); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Related Products of 15441-07-3, 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. 15441-07-3 name is Methyl 3-(chlorosulfonyl)propanoate, 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.

Synthesis of Benzyl (25,4a5,6a5,6bR, 8aR, 1OS,1 2a5, 1 2bR, 1 4bR)- 1 O-((3 -methoxy-3 -oxopropyl) sulfonamido)-2,4a,6a,6b,9,9, 12a-heptamethyl-13-oxo-1,2,3,4,4a,5,6,6a,6b,7,8,8a,9, 10,11, 12,12a, 1 2b, 13,1 4b-icosahydropicene-2-carboxylate (72-2). Into a 5 O-mL round-bottom flask, was placed 54-1 (300 mg, 1 equiv.), DCM (10 mL), methyl 3-(chlorosulfonyl)propanoate (200 mg,2.0 equiv.), TEA (0.223 mL). The resulting solution was stirred overnight at room temperature. The resulting mixture was concentrated under vacuum. The residue was applied onto a silica gel column with EtOAc/petroleum ether (1:2). This resulted in 326 mg (86%) of 72-2 as a light yellow solid.

At the same time, in my other blogs, there are other synthetic methods of this type of compound, Methyl 3-(chlorosulfonyl)propanoate, and friends who are interested can also refer to it.

Reference:
Patent; ARDELYX, INC.; LUEHR, Gary; DRAGOLI, Dean; LEADBETTER, Michael; CHEN, Tao; LEWIS, Jason; (181 pag.)WO2019/60051; (2019); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Adding a certain compound to certain chemical reactions, such as: 13831-03-3, name is tert-Butyl propiolate, 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 13831-03-3, SDS of cas: 13831-03-3

(ii) Di-tert-butyl 8,8′-(((5-(2,2-dimethyl-4,20-dioxo-3,8,11,14,17-pentaoxa-5,21-diazatetracos-23-yn-24-yl)-1,3-phenylene)bis(methylene))bis(oxy))(11S,11aS,11’S, 11a’S)-bis(7-methoxy-2-methylene-5-oxo-11-((tetrahydro-2H-pyran-2-yl)oxy)-2,3,11,11a-tetrahydro-H-pyrrolo[2,1-c][1,4]benzodiazepine-10(5H)-carboxylate) (28) A catalytic amount of Pd(PPh3)4 (23.0 mg, 19.5 mumol) was added to a mixture of the iodoaryl compound 2a (1.02 g, 0.89 mmol), Boc-acetylene 27 (393 mg, 0.98 mmol), CuI (7.4 mg, 39.1 mumol), diethylamine (2.02 mL, 1.43 g, 19.5 mmol) and oven-dried 4 A molecular sieve pellets in dry DMF (9 mL) in an oven-dried sealable vessel. The mixture was degased and flushed with argon 3 times then heated in a microwave at 100 C. for 26 minutes at which point analysis by LC/MS revealed substantial product formation at retention time 1.89 minutes (ES+) m/z 1446 ([M+Na]+, ?100% relative intensity, 1424 ([M+H]+, ?15% relative intensity). The reaction mixture was allowed to cool to room temperature and was then filtered through a sinter to remove the sieves (washed with DMF). The filtrate was evaporated in vacuo and the resulting residue dissolved in DCM (100 mL) and washed with H2O (20 mL), brine (30 mL), dried (MgSO4), filtered and evaporated in vacuo to give the crude product. Purification by flash chromatography (gradient elution in 1% increments: 100% DCM to 97:3 v/v DCM/MeOH) provided the alkyne 28 as a yellow foam (882 mg, 70% yield).

If you are interested in these compounds, you can also browse my other articles.Thank you for taking the time to read this article. I hope you enjoyed it.

Reference:
Patent; HOWARD, Philip Wilson; FLYGARE, John A.; PILLOW, Thomas; WEI, Binqing; US2014/294868; (2014); A1;,
Ester – Wikipedia,
Ester – 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. 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;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

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;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Application of 3153-37-5, 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. 3153-37-5, name is Methyl 4-chlorobutyrate, This compound has unique chemical properties. The synthetic route is as follows.

Step A: 1-(S)-(1-(R)-(3,5-Bis(trifluoromethyl)phenyl)ethoxy)-2-(R)-(4-fluorophenyl)-3-(R)-(((3-methoxycarbonylpropyl)methylamino)methyl)cyclopentane To a solution of 65 mg of 1-(S)-(1-(R)-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-2-(R)-(4-fluorophenyl)-3-(R)-((methylamino)methyl)cyclopentane from Example 18, Step B in 1 mL of acetonitrile was added 0.019 mL of methyl 4-chlorobutyrate and 0.037 mL of DIPEA. The reaction was heated at 50 C. for 48 hours, then an additional 0.038 mL of methyl 4-chlorobutyrate, 0.074 mL of DIPEA and 3 mg of tetrabutylammonium iodide were added and heating continued at 70 C. for 48 hours. The reaction was evaporated under a stream of nitrogen and the residue purified by prep TLC (10% methanol in ethyl acetate) to give 41 mg of title compound and 17 mg of recovered starting material. Mass spec (ESI): 564 (M+1).

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

Reference:
Patent; Finke, Paul E.; Meurer, Laura C.; Mills, Sander G.; MacCoss, Malcolm; Qi, Hongbo; US2002/42431; (2002); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics