Esters-buliding-blocks

Electric Literature of 72594-86-6,Some common heterocyclic compound, 72594-86-6, name is Benzyl tert-butyl malonate, molecular formula is C14H18O4, 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.

Step 4: 1-Benzyl 3-tert-butyl 2-undecylmalonate To a suspension of NaH (160 mg, 4.0 mmol) in DMF (8 mL) at 0¡ã C. under N2, was added benzyl tert-butyl malonate (1.0 g, 4.0 mmol) in DMF (2 mL). The mixture was stirred for 50 min after which 1-bromoundecane in DMF (2 mL) was added. After an additional hour of stirring the reaction was allowed to warm to room temperature. The reaction was maintained overnight. Et2O (100 mL) and water (20 mL) were added to partition the reaction. The aqueous phase was extracted with Et2O (100 mL), and the combined organics dried over Na2SO4. The solvent was evaporated and the residue purified by flash column (C18 12 g, 40-100percent ACN/water+0.1percent TFA) to yield the title compound as a colorless oil (1.14 g, 2.82 mmol, 71percent): LCMS Method F Rt=1.58 min, M+Na 427.4; 1H NMR (400 MHz, CHLOROFORM-d) delta ppm 0.84-0.96 (m, 3H) 1.28 (br. s, 12H) 1.31 (m, J=3.90 Hz, 6H) 1.41 (s, 9H) 1.88 (q, J=7.38 Hz, 2H) 3.29 (t, J=7.58 Hz, 1H) 5.19 (q, J=12.27 Hz, 2H) 7.30-7.42 (m, 5H).

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

Reference:
Patent; NOVARTIS AG; ZECRI, Frederic; GROSCHE, Philipp; YASOSHIMA, Kayo; ZHAO, Hongjuan; Yuan, Jun; USERA, Aimee Richardson; LOU, Changgang; KANTER, Aaron; BRUCE, Alexandra Marshall; Giumaraes, Carla; US2015/31604; (2015); A1;,
Ester – Wikipedia,
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Application of 15441-07-3, These common heterocyclic compound, 15441-07-3, name is Methyl 3-(chlorosulfonyl)propanoate, 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 Compound IE (40 mg, 0.092 mmol) and triethylamine (0.026 mL, 0.184 mmol) in CH2CI2 (1 mL) in an ice bath was added methyl 3- (chlorosulfonyl)propanoate (25.7 mg, 0.138 mmol). Upon completion of addition, the reaction mixture was stirred in the ice bath for 15 min. After this time, the reaction mixture was allowed to warm to rt, where it stirred for 3 h. At the conclusion of this period, the reaction mixture was quenched with saturated aq aHCOs (1 mL) and then extracted with CH2CI2 (3 x 2 mL). The combined organic layers were dried( a2S04), filtered, and concentrated to yield a residue. The residue was purified by column chromatography (silica gel, CELC^-EtOAc gradient 0 to 90% EtOAc) to afford Example 2 as a white solid (42 mg, 78% yield). XH NMR (500 MHz, DMSO- d6) delta ppm 8.24 (2H, s), 7.98 (IH, d, J=1.9 Hz), 7.64 (IH, d, J=8.5 Hz), 7.51 (IH, dd, J=8.5, 1.9 Hz), 6.20 – 6.26 (IH, m), 5.36 – 5.44 (IH, m), 4.15 – 4.23 (2H, m), 3.91 – 3.95 (2H, m), 3.62 (3H, s), 3.51 – 3.59 (2H, m), 3.46 (2H, t, J=5.6 Hz), 3.40 (2H, t, J=7.2 Hz), 2.74 (2H, t, J=7.2 Hz), 2.57 – 2.66 (2H, m), 2.38 (2H, t, J=7.4 Hz), 2.09 – 2.19 (2H, m), 1.70 – 1.81 (2H, m), 1.47 – 1.58 (2H, m), 0.88 (3H, t, J=7.3 Hz).LC/MS (m/z) = 586 (M+H)+.

The synthetic route of 15441-07-3 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; BRISTOL-MYERS SQUIBB COMPANY; YE, Xiang-Yang; WACKER, Dean A.; ROBL, Jeffrey A.; WANG, Ying; WO2011/140160; (2011); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Synthetic Route of 17994-94-4, These common heterocyclic compound, 17994-94-4, name is Methyl 7-aminoheptanoate hydrochloride, 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.

Methyl 7-(2-trimethylsilanyl-ethoxycarbonylamino)-heptanoate Methyl 7-amino-heptanoate hydrochloride (7.0 g, 35.9 mmol) was dissolved in dichloromethane (75.4 mL), and N-[2-(trimethylsilyl)ethoxycarbonyloxy]succinimide (10.0 g, 38.6 mmol) and triethylamine (10 mL, 71.7 mmol) were then added at room temperature. The mixture was stirred for 5 hours, and then quenched with water (100 mL), and separated. The aqueous layer was extracted with dichloromethane (50 mL). The organic layers were combined, then dried over anhydrous sodium sulfate, and filtered. The solvent was distilled off under reduced pressure to obtain 8.89 g (29.3 mmol, 82% yield) of methyl 7-(2-trimethylsilanyl-ethoxycarbonylamino)-heptanoate. 1H-NMR (CDCl3) delta: 0.04 (9H, s), 0.97 (2H, br.t, J = 8.4 Hz), 1.20-1.76 (8H, m), 2.31 (2H, t, J = 7.4 Hz), 3.07-3.23 (2H, m), 3.67 (3H, s), 4.14 (2H, br.t, J = 8.4 Hz), 4.50-4.70 (1H, m)

Statistics shows that Methyl 7-aminoheptanoate hydrochloride is playing an increasingly important role. we look forward to future research findings about 17994-94-4.

Reference:
Patent; Chugai Seiyaku Kabushiki Kaisha; KOHCHI, Yasunori; NAKAMA, Kimitaka; KOMIYAMA, Susumu; WATANABE, Fumio; EP2886530; (2015); A1;,
Ester – Wikipedia,
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Synthetic Route of 64123-77-9, 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. 64123-77-9, name is Methyl 2-(3-fluorophenyl)acetate, This compound has unique chemical properties. The synthetic route is as follows.

Example 21: (R)-3-[l-(3-Fluoro-phenyl)-cycloheptanecarbonyloxy]-l-(5-phenyl- [l,3,4]oxadiazol-2-ylmethyl)-l-azonia-bicyclo[2.2.2]octane chloride a) 2-But-3-enyl-2-(3-fluoro-phenyl)-hex-5-enoic acid methyl ester (3-Fluoro-phenyl)-acetic acid methyl ester (4.30 g) was dissolved in tetrahydrofuran (20 mL) and cooled to -78C. Lithium zs(trimethylsilyl)amide (25.6 mL, IM THF solution) was added and the solution was stirred for 30 minutes. 4-Bromo-but-l-ene (2.60 mL) was added and the reaction was allowed to warm to room temperature and stirred for an hour. The reaction was again cooled to -78C. Lithium zs(trimethylsilyl)amide (25.6 mL, IM THF solution) was added and the solution was stirred for 30 minutes. 4-Bromo-l-butene (2.60 mL) was added and the reaction was allowed to warm to room temperature and stirred for an hour. The reaction was again cooled to -78C and further aliquots of Lithium zs(trimethylsilyl)amide (25.6 mL, IM THF solution) and 4-bromo-l-butene (2.60 mL) were added following the procedure outlined above. After stirring overnight, water (20 mL) was added and the reaction mixture extracted with diethyl ether (2 x 60 mL). The combined organic extracts were dried with magnesium sulfate and evaporated. The resulting liquid was purified by column chromatography on silica eluting with ethyl acetate / iso hexane (1 / 99) to afford the sub-titled compound (5.0 g).m/e 277 [M+H]+

The chemical industry reduces the impact on the environment during synthesis Methyl 2-(3-fluorophenyl)acetate. I believe this compound will play a more active role in future production and life.

Reference:
Patent; ASTRAZENECA AB; ARGENTA DISCOVERY Ltd.; FORD, Rhonan; WO2009/139709; (2009); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Application of 185312-82-7, These common heterocyclic compound, 185312-82-7, name is Methyl 4-bromo-2-chlorobenzoate, 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 product from Example 143 Part A (1.0 g, 4.0 mmol), Zn (CN)2 (0.52 g, 4.8 mmol), Pd (PPh3)4 g, 0.2 mmol) were added together with 9 mL of DMF. The mixture was degassed and then heated at 90 C for 6 h. Water and EtOAc were added to the reaction mixture. It was filtered to remove inorganic solids. The layers were separated and the EtOAc layer was washed with water and brine. It was dried over MgS04, concentrated, and purified by flash chromatography (silica, EtOAc/hexane) to give 0.28 g of the desired product. MS: 196.1 (M+1)+.

Statistics shows that Methyl 4-bromo-2-chlorobenzoate is playing an increasingly important role. we look forward to future research findings about 185312-82-7.

Reference:
Patent; BRISTOL-MYERS SQUIBB COMPANY; WO2005/123050; (2005); A2;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Electric Literature of 610-96-8, These common heterocyclic compound, 610-96-8, name is Methyl 2-chlorobenzoate, 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: Cross-Coupling of ortho-, meta-, and para-Substituted, Electron-Rich and Electron-Deficient Aryl Halides and Aryl Mesylates with Aryl Neopentylglycolboronates Catalyzed by NiIICl(1-naph-thyl)(PCy3)2/PCy3 in Anhydrous THF at 23 C; General Procedure 2In an oven-dried test tube charged with a Teflon coated stirring barwere added aryl halide or aryl mesylate (0.3 mmol), aryl neopentyl-glycolboronates (0.315 mmol), K3PO4(H2O)3.2 (191.00 ¡À 1.00 mg, 0.9mmol), and NiIICl(1-naphthyl)(PCy3)2 (11.73 ¡À 0.0510 mg, 0.015mmol, 5% catalyst loading). The test tube was brought into a N2 filledglove box (moisture level <2 ppm) through three degassing cycles andPCy3 (8.4 mg, 0.03 mmol, 10% loading) ligand was added. Distilled sol-vent (1 mL) was added inside the glove box and the test tube wassealed by a rubber septum and left stirring at 23 C. A sample was tak-en by syringe and transferred outside the glove box. The sample wasdiluted by distilled THF (0.2 mL) and filtered through a short columnof Al2O3. The filtrate was concentrated and the GC analysis was car-ried out. The reaction mixture was diluted with CH2Cl2 (2 mL), filteredthrough a layer of Al2O3, and washed with CH2Cl2 (3 1 mL). The fil-trate was collected and concentrated under vacuum. The crude prod-uct was purified by column chromatography on silica gel with EtO-Ac/hexane mixture as eluent. The reductive elimination side-productwas also isolated and characterized. The synthetic route of 610-96-8 has been constantly updated, and we look forward to future research findings. Reference:
Article; Malineni, Jagadeesh; Jezorek, Ryan L.; Zhang, Na; Percec, Virgil; Synthesis; vol. 48; 17; (2016); p. 2795 – 2807;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Adding a certain compound to certain chemical reactions, such as: 685-88-1, name is Diethyl fluoromalonate, 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 685-88-1, Computed Properties of C7H11FO4

Example 4 4,6-Dihydroxy-5-fluoropyrimidine 30% sodium methoxide in methanol (63.0 g, 0.35 mol) are rapidly admixed with formamide (33.75 g, 0.75 mol) and the mixture is heated to reflux temperature. At reflux, ethyl fluoromalonate (17.8 g, 95.0 mmol, content: about 95%) is then added over a period of 200 min, and the mixture is stirred at reflux temperature for a further 3 h. The suspension is concentrated completely under reduced pressure, the residue is dissolved in water (65 ml) and the pH of the solution is adjusted to pH 1 using 30% HCl. The resulting precipitate is then filtered off with suction and dried at 100 C. under reduced pressure overnight. This gives 4,6-dihydroxy-5-fluoropyrimidine (12.1 g, content (HPLC-STD): 90.2%; 88.3% of theory) as a solid.

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

Reference:
Patent; Bayer Aktiengesellschaft; US6255486; (2001); B1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Synthetic Route of 73368-41-9, A common heterocyclic compound, 73368-41-9, name is Ethyl 4-amino-3-methoxybenzoate, molecular formula is C10H13NO3, 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.

[0554j Ethyl 4-amino-3-methoxybenzoate (5-C) (3 g, 15.37 mmol) was dissolved in MeCN (10 mL), K2C03 (5.310 g, 38.43 mmol) and ethyl bromide (3.350 g, 30.73 mmol) were added. The solution was stirred at 100C for 24 h in a 30 mL of autoclave. The mixture was filtered and the filtrate was concentrated to afford ethyl 4-(diethylamino)-3- methoxybenzoate (5-D) (392 mg).

The synthetic route of 73368-41-9 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; ALIOS BIOPHARMA, INC.; WANG, Guangyi; BEIGELMAN, Leonid; TRUONG, Anh; NAPOLITANO, Carmela; ANDREOTTI, Daniele; HE, Haiying; WO2014/31784; (2014); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Application of 126430-46-4,Some common heterocyclic compound, 126430-46-4, name is Benzyl 4-bromobutanoate, molecular formula is C11H13BrO2, 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.

REFERENCE EXAMPLE 8 A mixture of benzyl 4-bromobutyrate (23.7 g), imidazole (8.1 g), potassium carbonate (14.0 g) and acetone (400 ml) was stirred under reflux for 6 hours. After cooling the mixture to room temperature, the insoluble material was filtered off, and the filtrate was concentrated. The residual oil was subjected to column chromatography on silica gel. The fractions eluted with ethyl acetate/methanol (20/1, v/v) gave benzyl 4-(1-imidazolyl)butyrate (7.3 g, 33%) as an oil. NMR (delta ppm in CDCl3): 2.11 (2H,m), 2.34 (2H,t,J=6.8 Hz), 3.99 (2H,t,J=6.8 Hz), 5.12 (2H,s), 6.87 (1H,s), 7.05 (1H,s), 7.30-7.40 (5H,m).

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

Reference:
Patent; Takeda Chemical Industries, Ltd.; US5719157; (1998); A;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

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 87-13-8 as follows. Recommanded Product: 87-13-8

Compound 23 (4.77 g, 47.7 mmol) was added dropwise to Compound 22 (10 g, 46.3 mmol) with subsurface N2 flow to drive out ethanol below 30 C for 0.5 hours. The solution was then heated to 100-110 C and stirred for 2.5 hours. After cooling the mixture to below 60 C, diphenyl ether was added. The resulting solution was added dropwise to diphenyl ether that had been heated to 228-232 C for 1.5 hours with subsurface N2 flow to drive out ethanol. The mixture was stirred at 228-232 C for another 2 hours, cooled to below 100 C and then heptane was added to precipitate the product. The resulting slurry was stirred at 30 C for 0.5 hours. The solids were then filtered, and the cake was washed with heptane and dried in vacuo to give Compound 25 as a brown solid. 1H NMR (DMSO-d6; 400 MHz) delta 12.25 (s), delta 8.49 (d), delta 8.10 (m), delta 7.64 (m), delta 7.55 (m), delta 7.34 (m), delta 4.16 (q), delta 1.23 (t).

According to the analysis of related databases, 87-13-8, the application of this compound in the production field has become more and more popular.

Reference:
Patent; VERTEX PHARMACEUTICALS INCORPORATED; VAN GOOR, Fredrick, F.; WO2013/67410; (2013); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics