Author: Jessica.F

Synthetic Route of 1126-46-1, 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. 1126-46-1, name is Methyl 4-chlorobenzoate, This compound has unique chemical properties. The synthetic route is as follows.

EXAMPLE 8 Cross Coupling with a Zincate as the Nucleophile A solution of EtMgBr (3 M in Et2O, 0.9 mL) is added to a solution of Et2Zn (3 M in toluene, 1 mL) at -78 C. After stirring for 15 min, the resulting cold solution of the zincate is added dropwise to a solution of methyl 4-chlorobenzoate (354 mg, 2.10 mmol) and Fe(acac)3 (36 mg, 0.1 mmol) in THF (6 mL) and NMP (0.5 mL) at 0 C. causing a spontaneous color change from yellow to brown-black. Standard extractive work up followed by flash chromatography affords 4-ethylbenzoic acid methyl ester (93%) the analytical and spectroscopic data of which are identical to those of a commercial sample.

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

Reference:
Patent; Furstner, Alois; Leitner, Andreas; Mendez, Maria; US2003/220498; (2003); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Reference of 10328-87-7, 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. 10328-87-7, name is Methyl 2,3-Dichlorophenylacetate, This compound has unique chemical properties. The synthetic route is as follows.

Step A: Preparation of Methyl 2-(2,3-dichlorophenyl)-2- methylpropanoate; [0472] A solution ofNaH (2.87 g, 71.8 mmol) in DMF (100 mL) was cooled to 00C. A solution of methyl 2-(2,3-dichlorophenyl)acetate (5.24 g, 23.9 mmol) in DMF(50 mL) was added dropwise, and the resulting mixture was stirred for 5 minutes. A solution of MeI (4.36 mL, 69.8 mmol) in DMF (50 mL) was then added to the reaction. After 10 minutes, the mixture was allowed to warm to 25C and the reaction was stirred for 16 hours. The mixture was diluted with 10% HCl(aq) (150 mL), and the resulting mixture was extracted with EtOAc (2×200 mL) and washed with 10% HCl(aq) (100 mL), deionized water (2×150 mL), and brine (100 mL). The organic layer was dried over MgSO4 and concentrated and dried in vacuo to give 7.06g crude product. The crude product was purified by flash column chromatography (silica, 0-50% DCM in hexane) to give the title compound (5.53 g). MS m/e = 247 (M+H)+.

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

Reference:
Patent; AMGEN INC.; WO2008/76427; (2008); A2;,
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. 39495-82-4, name is Ethyl 5-methylhex-5-enoate, A new synthetic method of this compound is introduced below., Quality Control of Ethyl 5-methylhex-5-enoate

A 100-mL RBF with magnetic stirrer,was flame-dried under vacuum and back-filled with a nitrogen atmosphere, then chargedwith Ethyl 5-methyl-5-hexenoate (1.5 g, 9.60 mmol) and dry DCM (30 mL). The solutionwas cooled to -78 C before the dropwise addition of diisobutylaluminium hydride (10.37mL, 1.01 M in hexanes). The mixture was stirred at this temperature for 1 h, then excessDIBAL-H was quenched by the addition of 1.0 M HCl (aq) (10 mL). Dichloromethane(30 mL) was added and the solution was warmed to 23 C and the biphasic mixture wasseparated. The Organic layer was washed with 1.0 M HCl (aq) (15 mL), the aqueouslayers were combined and extracted with DCM (2 x 15 mL). All organic layers were combined and pushed through a plug of Celite, washing with DCM (2 x 10 mL). TheDCM solution containing 5-methylhex-5-enal was transferred to a 250-mL RBF,equipped with a magnetic stirrer and dried with MgSO4 before the addition of N,Ndimethylhydrazine(1.15 g, 19.2 mmol). This mixture was stirred for 4 h at 23 C, filtered,concentrated in vacuo and purified by vacuum transfer distillation (0.5 torr) to yield 1.22g of the title compound as a colorless oil.

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; Mickelsen, Ky; Zabawa, Sean; Livinghouse, Tom; Synlett; vol. 29; 2; (2018); p. 181 – 184;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Reference of 57625-74-8, 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. 57625-74-8, name is Methyl 2-methyl-2-phenylpropanoate belongs to esters-buliding-blocks compound, it is a common compound, a new synthetic route is introduced below.

Into a 250-ML THREE-NECKED FLASK there were placed 2.5 g of 2-PHENYL-2-METHYL propionic acid methyl ester and 2.4 g of zinc cyanide and 100 ml of tetrachloroethane. A strong flow of hydrogen chloride was introduced into the flask with intense stirring during 4 hours. The flask was cooled down with an ice bath and 4.8 g of finely divided aluminium chloride were added in one dose with continued intense stirring. The stirring continued for another thirty minutes and the flask was placed onto an oil bath where it was gradually heated up to the temperature of 70 C. Further on, the mixture was kept at the given temperature for three hours. After cooling with running water, the contents of the flask were poured onto crushed ICE/15M1 conc. HCI. The reaction mixture was left to stand overnight. Then it was transferred to the flask where it was REFLUXED for three hours and after cooling, it was divided in a separatory funnel. The organic layer was separated; the aqueous layer was extracted with 15 mi of TETRACHLOROETHANE. The combined organic extracts were washed with water, with 10% sodium carbonate and dried over sodium sulphate. The solvent was distilled off until 1/3 of the volume and the product was filtered through a short column of silica gel. 2. 1 G of the product were obtained having 92.6% GC purity.

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

Reference:
Patent; ZENTIVA, A.S.; WO2004/43922; (2004); A1;,
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 139911-28-7 as follows. Computed Properties of C9H8BrFO2

Example 2 – ethyl 2-cyano-5-fluorobenzoateZinc cyanide (26.5 g; 0.225 mol) and Pd2(dba)3 (1.9 g; 3.4 mmol) were added to a solution of ethyl 2-bromo-5-fluorobenzoate (27.9 g; 0.112 mol) in DMF (71 ml). Triphenyl phosphine (2.9 g; 1 1 mmol) was added and then the reaction mixture was stirred at 130C under nitrogen atmosphere for 4 hours. The mixture was poured out into H2O (300 ml) and then extracted with EtOAc (200 ml). The organic layer was separated, washed with H2O (2 x 100 ml), brine (100 ml), dried (MgS04), filtered and the solvent was evaporated. The residue was purified by column chromatography over silica gel (eluent: hexanes/ EtOAc (5/1, v/v)). The product fractions were collected and the solvent was evaporated.Yield: 20 g (93%; orange solid).

According to the analysis of related databases, 139911-28-7, the application of this compound in the production field has become more and more popular.

Reference:
Patent; ELANCO ANIMAL HEALTH IRELAND LIMITED; THURING, Johannes, Wilhelmus J.; WO2012/112345; (2012); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Related Products of 18014-00-1, A common heterocyclic compound, 18014-00-1, name is Dimethyl 2,5-dibromoterephthalate, molecular formula is C10H8Br2O4, 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: To a 15 mL vial tube equipped with a magnetic stirring bar and a teflon screw cap were addeddimethyl 2,5-dibromoterephthalate (0.28 g, 0.8 mmol),1) N-methylaniline derivative (8.0 mmol),Pd2(dba)3 (34 mg, 0.06 mmol), RuPhos (70 mg, 0.24 mmol), K3PO4 (1.70 g, 8.0 mmol), and toluene(3.2 mL) under argon atmosphere. The mixture was stirred at 100 C for 10 h. The resultingmixture was allowed to cool to room temperature, and CH2Cl2 (10 mL) was added to the vial. Theprecipitate was removed by suction filtration and the filtrate was concentrated by evaporation underreduced pressure. The crude product was purified by column chromatography on silica gel(hexane/CH2Cl2 2:1 to 1:1) to give 1.

The synthetic route of 18014-00-1 has been constantly updated, and we look forward to future research findings.

Reference:
Article; Shimizu, Masaki; Asai, Yuiga; Takeda, Youhei; Yamatani, Akinori; Hiyama, Tamejiro; Tetrahedron Letters; vol. 52; 32; (2011); p. 4084 – 4089;,
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. 25415-67-2, name is Ethyl 4-methylpentanoate, A new synthetic method of this compound is introduced below., Application In Synthesis of Ethyl 4-methylpentanoate

REFERENCE EXAMPLE 11 Ethyl 2-(4-bromophenylacetyl)-4-methyl-3-oxopentanoate To a suspension of NaH (7.6 g, 158 mmol) in toluene (142 mL) at 0 C. was added dropwise a solution of ethyl isobutylylacetate (20 g, 126 mmol) in toluene (52 mL) and the resulting solution was stirred under an argon atmosphere for 30 min. Then, a solution of 4-bromophenylacetyl chloride (29.4 g, 126 mmol, prepared as described in reference example 1) in toluene (98 mL) was slowly added and the reaction mixture stirred at room temperature overnight. The resulting solution was poured into H2 O-EtOAc and extracted with H2 O (2*). The organic phase was washed with brine, the aqueous phase was acidified and extracted with EtOAc, and the combined organic phases were dried and concentrated. The residue was chromatographed on silica gel (hexane-EtOAc, 5%) to afford the title compound (29 g, 65%). 1 H-NMR-(CDCl3) delta (TMS): 1.16 (d, J=6.4 Hz, 6H), 1.31 (t, J=7.2 Hz, 3H), 3.09 (q, J=6.4 Hz, 1H), 3.87 (s, 2H), 4.26 (q, J=7.2 Hz, 2H), 7.12 (d, J=8 Hz, 2H), 7.41 (d, J=8 Hz, 2H), 17.49 (s, 1H).

The synthetic route of 25415-67-2 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; J. Uriach & Cia, S.A.; US5827863; (1998); A;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Related Products of 2171-74-6, A common heterocyclic compound, 2171-74-6, name is Benzo[d][1,3]dioxol-2-one, molecular formula is C7H4O3, 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.

Molar ratio between the reagents PCC:ethanol = 1:6.In a two-neck flask 520 jil of ethanol, the basic catalyst (sodium methoxide, in a molar ratio of 1 to 30 with respect to the PCC, 0.003 g),and in the end the PCC (0.201g) are initially added.Subsequently, the flask is equipped with two condensers, rinsed and placed in inert nitrogen atmosphere (refrigerants closed at the ends by suitable caps) and heated, in an oil bath and under magnetic stirring, at the temperature of 60C for one hour.After the reaction, the mixture is rapidly cooled to room temperature and the whole is recovered and solubilized in 10 ml of HPLC acetone. 10 il of decane as an internal standard for the analysis are then added.Gas chromatographic analysis was performed with a Focus-GC instrument model of Thermo, equipped with a HP-5 capillary column anda FID detector.The desired product (DEC) is obtained with a gas chromatographic yield of 93% with a total conversion of the limiting reagent (PCC), without any substantial trace of undesired products, beside the catechol (co-product of the reaction).

The synthetic route of 2171-74-6 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; ALMA MATER STUDIORUM – UNIVERSITA DI BOLOGNA; UNIVERSITA CA’ FOSCARI; TABANELLI, Tommaso; CAVANI, Fabrizio; SELVA, Maurizio; (37 pag.)WO2017/51363; (2017); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Application of 87661-20-9,Some common heterocyclic compound, 87661-20-9, name is tert-Butyl cyclopropanecarboxylate, molecular formula is C8H14O2, 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 1: A solution of n-butyl lithium in hexane (1.4M, 95.7 mL, 0.13 mol) was added drop wise to a solution of freshly distilled diisopropylamine (18.75 mL, 0.12 mol) in dry THF (400 mL) at -60 C. under nitrogen atmosphere. The reaction mixture was slowly warmed to -20 C. and stirred for 30 min. The reaction mixture was re-cooled to -60 C. and cyclopropanecarboxylic acid tert-butyl ester (17.34 g, 0.12 mol) added drop wise over a period 30 min. Reaction mixture was slowly warmed to -20 C. and stirred for 30 min. To the re-cooled (-60 C.) reaction mixture was added drop wise 1,12-dibromododecane (40.0 g, 0.12 mol) in dry THF (40 mL) and DMPU (3.12 g, 0.02 mol). Then the temperature was allowed to reach room temperature and stirred at same temperature over a period of 16 h. The resulting reaction mixture was quenched with saturated NH4Cl (500 mL) at 0 C. and the reaction mixture was extracted with ethyl acetate (400 mL×3). The organic phases were combined, dried over anhydrous Na2SO4 and volatiles were evaporated under reduced pressure to yield a pale yellow liquid which was purified through silica gel (230-400) column (0.5% ethyl acetate in petroleum ether) to give product as pale yellow liquid 14.0 g (29%).1H NMR (300 MHz, DMSO-d6) delta (ppm): 1.55-1.61 (m, 2H), 1.08-1.12 (m, 2H), 1.35 (bs, 13H), 1.49 (bs, 16H), 1.64-1.89 (m, 2H), 3.42 (t, J=6.9 Hz, 2H).

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

Reference:
Patent; KAREUS THERAPEUTICS, SA; US2012/71528; (2012); 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. 18014-00-1, name is Dimethyl 2,5-dibromoterephthalate, A new synthetic method of this compound is introduced below., Formula: C10H8Br2O4

210 mg of 4-fluorothiopheneboronic acid, 170 mg of dimethyl 2,5-dibromobenzene-1,4-dicarboxylate,116mg PdCl2 (MeCN) 2, 336mg saturated K2CO3 aqueous solution was placed in a two-port bottle,Add 12 mL of tetrahydrofuran,The mixture was heated and stirred under reflux for 7 hours under argon.After cooling to room temperature, it was extracted with 30 mL of diethyl ether.The combined organic layers were washed with saturated brine andNa2SO4 is dry.The solution was then filtered and the solvent removed to give a crude material which was crystallised from ethanol.The product was obtained as a yellow solid. A mixture of 500 mg of yellow solid in 20 mL of ethanol and 286 mg of NaOH was refluxed for 7 h.After cooling to room temperature, the mixture was poured into hydrochloric acid.A yellow solid product was obtained by suction filtration.The yellow solid was mixed with 50 mL of polyphosphoric acid, and the mixture was stirred at 130 C for 3 hours and then washed with ice water. A black solid crude product was obtained by suction filtration.The obtained crude product was recrystallized from dimethylformamide to give a final product with a metallic luster.

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; Lanzhou University; Zhang Haoli; Liu Duanwu; Lin Zewei; Xu Zhuguo; Shi Zifa; (13 pag.)CN109678877; (2019); A;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics