Month: June 2021

Electric Literature of 5433-01-2, 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. 5433-01-2, name is 1-Bromo-3-isopropylbenzene, This compound has unique chemical properties. The synthetic route is as follows.

Method 72; 3-Isopropylbenzoic acid; A solution of l-bromo-3-isopropylbenzene (500 mg, 2.51 mmol) in pentane/ether (1:1; 8 ml) was treated with t-butyllithium (1.7 M in pentane, 3.0 ml) at -78 C. The mixture was stirred at -78 0C for 10 min and then CO2 (g) was bubbled into the mixture for several minutes. The reaction was quenched with 10% HCl and extracted with EtOAc. The organic layer was dried with NaCl (sat) then Na2SO4 (s). The solvents were removed under reduced pressure to give a white solid (379 mg, 92%); m/z 166.

The chemical industry reduces the impact on the environment during synthesis 1-Bromo-3-isopropylbenzene. I believe this compound will play a more active role in future production and life.

Reference:
Patent; ASTRAZENECA AB; ASTRAZENECA UK LIMITED; WO2006/40568; (2006); A1;,
Bromide – Wikipedia,
bromide – Wiktionary

Application of 327-52-6, A common heterocyclic compound, 327-52-6, name is 1-Bromo-2,4,5-trifluorobenzene, molecular formula is C6H2BrF3, 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.

4.2 mL of 1-bromo-2,4,5-trifluorobenzene and 10.8 mL of tetrahydrofuran were added to 50 mL flask and the resulting reaction solution was cooled to 0 C. 15 mL of isopropylmagnesium chloride [2.0 M tetrahydrofuran solution] was dropped to the reaction solution under nitrogen atmosphere and stirred for 30 minutes to produce Grinard reagent. 1.95 g of (S)-t-butyl 2-(2-t-butoxy-2-oxoethyl)aziridine-1-carboxylate and 50 mL of tetrahydrofuran were added to another 250 mL flask and the resulting reaction solution was cooled to 0 C. And then, 778 mg of copper (I) bromide dimethylsulfide complex was added. 22.7 mL of the Grinard reagent produced under nitrogen atmosphere was dropped, and stirred for 6 hours while the reaction temperature was maintained at 0 C. After completing the reaction, 50 mL of ammonium chloride aqueous solution was dropped to the reaction solution; 100 mL of ethyl acetate and 50 mL of water were added and then stirred for 10 minutes. An organic layer was isolated, dehydrated with magnesium sulfate, and then concentrated under reduced pressure. A concentrated residue was isolated with column chromatography (n-hexane:ethyl acetate=20:1) and then concentrated under reduced pressure to obtain 2.62 g of a title compound. 1H NMR (CDCl3, 400 MHz) delta 7.02 (m, 1H), 6.87 (m, 1H), 5.11 (br, 1H), 4.07 (br, 1H), 2.82 (dd, 1H), 2.77 (dd, 1H), 2.45 (dd, 1H), 2.35 (dd, 1H), 1.44 (s, 9H), 1.35 (s, 9H)

The synthetic route of 327-52-6 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; DONG-A PHARMACEUTICAL. CO., LTD; US2012/16126; (2012); A1;,
Bromide – Wikipedia,
bromide – Wiktionary

Some common heterocyclic compound, 4549-33-1, name is 1,9-Dibromononane, molecular formula is C9H18Br2, 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. HPLC of Formula: C9H18Br2

2,2,12,12-Tetramethyltridecanedioic acid diethyl ester (153). Under N2 atmosphere and at -78 C., a solution of lithium diisopropylamide (2 M in heptane/THF/ethylbenzene, 52.5 mL, 105 mmol) was added dropwise to a solution of ethyl isobutyrate (17.4 g, 150 mmol) in THF (50 mL). The mixture was stirred for 1 h and 1,9-dibromononane (151, 14.3 g, 50 mmol) was added, followed by DMPU (4.4 g, 34.3 mmol). The mixture was stirred for 30 min and the cooling bath was removed. After 30 min, the THF was evaporated under reduced pressure. The residue was diluted with saturated NH4Cl solution (300 mL) and extracted with ethyl acetate (3*100 mL). The combined organic layers was washed with brine (200 mL), 5% aqueous HCl (100 mL) and saturated NaHCO3 solution (50 mL), and dried over Na2SO4. The solvent was removed under reduced pressure and the residue was distilled in high vacuo to give 153 (14.0 g, 79%) as an oil. Bp 150-151 C./0.1 mmHg. 1H NMR (CDCl3): delta (ppm): 4.08 (q, J=7.2, 4H), 1.48-0.98 (m, 18H), 1.21 (t, J=7.2, 6H), 1.12 (s, 12H). 13C NMR (CDCl3): delta (ppm): 178.1, 60.0, 42.1, 40.7, 30.0, 29.4, 25.1, 24.8, 14.2.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 4549-33-1, its application will become more common.

Reference:
Patent; Dasseux, Jean-Louis Henri; Oniciu, Carmen Daniela; US2004/192771; (2004); A1;,
Bromide – Wikipedia,
bromide – Wiktionary

Application of 167355-41-1,Some common heterocyclic compound, 167355-41-1, name is 6-Bromo-1,2,3,4-tetrahydronaphthalen-2-amine, molecular formula is C10H12BrN, 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.

Di-tert-butyl dicarbonate (1.030 g, 4.719 mmol) was added to a stirred RT solution of 6-bromo-1,2,3,4-tetrahydro-naphthalen-2-ylamine (0.970 g, 4.290 mmol) in CH2Cl2 (100 mL). TEA (0.897 mL, 6.435 mmol) was added to the reaction and the mixture was stirred at RT until HPLC analysis showed complete consumption of starting material. The reaction was diluted with CH2Cl2, washed with saturated aqueous NaHCO3, dried over MgSO4 and concentrated in vacuo to afford the crude material. The crude was purified by flash column chromatography to yield the title compound. MS (APCI pos) 269 (M-t-Bu).

The synthetic route of 167355-41-1 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Amgen Inc.; Array Biopharma, Inc.; US2005/234044; (2005); A1;,
Bromide – Wikipedia,
bromide – Wiktionary

Adding a certain compound to certain chemical reactions, such as: 1647-26-3, name is 1-Bromo-2-cyclohexylethane, belongs to bromides-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 1647-26-3, Safety of 1-Bromo-2-cyclohexylethane

To a solution of chloro-6-methyl-2-[2-(methyloxy)phenyl]-4(1 H)-pyrimidinone (0.42g, 1.7 mmoles) in DMF were added lithium hydride (0.027g, 3.4 mmoles), lithium bromide (0.436g, 5.0 mmoles), and 2-cyclohexylethyi bromide (1.6g, 8.4 mmoles). Upon stirring overnight at room temperature, the reaction was quenched with saturated ammonium chloride, extracted with ethyl acetate. The combined organic layers were washed with brine, dried over sodium sulfate, filtered, concentrated in vacuo and the residue purified by flash chromatography (0-30% ethyl acetate/hexane) to afford the desired product (0.23g, 38%). Subsequent deprotection using BBr3 was accomplished to produce the title compound (0.2g, 90%). MS (m/z): 347.2 [M+ H]+.

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; SMITHKLINE BEECHAM CORPORATION; WO2007/62370; (2007); A2;,
Bromide – Wikipedia,
bromide – Wiktionary

Related Products of 608-30-0, A common heterocyclic compound, 608-30-0, name is 2,6-Dibromoaniline, molecular formula is C6H5Br2N, 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.

(1) Adding 1 mole of 2,6-dibromoaniline to a four-necked flask,Adding 50% sulfuric acid to the flask, stirring was started, and a 15% aqueous solution of sodium nitrite was added dropwise at a temperature of 0-5 C, and the dropping time was 2 hours.After the dropwise addition is kept for 1 hour, 2,6-dibromoaniline is subjected to diazotization reaction at 0 to 5 C under acidic conditions, and the reaction is completed to obtain a dibromoaniline diazonium salt aqueous solution;The molar ratio of 2,6-dibromoaniline to sodium nitrite is 1:1.05, and the molar ratio of sodium nitrite to sulfuric acid is 1:4;(2) adding hypophosphorous acid to the flask in the dibromoaniline diazonium salt aqueous solution prepared in the step (1), then raising the temperature to 70-80 C, and maintaining the reaction for 3 hours to obtain a mixed solution containing m-dibromobenzene. ; the molar ratio of hypophosphorous acid to 2,6-dibromoaniline is 1.3:1;(3) The mixture obtained in the step (2) is allowed to stand for 30 minutes to be layered, and then the inorganic phase and the organic phase are separated, the organic phase is washed with water, and the inorganic phase and the organic phase are separated by standing. The organic phase can be distilled under reduced pressure to obtain m-dibromobenzene; the calculated yield is over 81%, and the detection purity is over 98%.

The synthetic route of 608-30-0 has been constantly updated, and we look forward to future research findings.

Reference:
Patent; Shandong Tianyi Chemical Co., Ltd.; Tang Xingsan; Xing Xiaohua; Zhang Ming; (6 pag.)CN110078587; (2019); A;,
Bromide – Wikipedia,
bromide – Wiktionary

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. 61613-22-7, name is 2-Bromo-N-phenylaniline, A new synthetic method of this compound is introduced below., HPLC of Formula: C12H10BrN

To obtain the D1-DPS, compound 1a of the -OH formationreaction, and compound 2 of the cyclization reactionwere synthesized. Compound 1 (3 g, 12 mmol) was dissolvedin 50 ml of anhydrous tetrahydrofuran (THF) underhigh purity argon in a one neck round bottom flask. It wascooled to -78 C using solid carbon with acetone and then n-butyllithuim (2.5 M in cyclohexane, 24.7 mmol)was added dropwise slowly. Stirring was continued for 1 h before, cooling for 20-30 min. Then a solution of9-fluorenone (2.4 g, 13.3 mmol) in THF was added at-78 C under an argon atmosphere. The mixture wasstirred for 3 h in the same environment. The reaction was completed after the confirmation of compound 1a. Two side products and reactants appeared by TLC with a solutionof hexane and ethyl acetate (10:1). Additional quenching was not required. The mixture was then worked up using water and dichloromethane. The extracted organiclayer was dried by anhydrous MgSO4. For compound 2, compound 1a was placed in a oneneckround bottom flask, to which, chloroform (10 ml)and methane sulfonic acid (MSA, 5 ml) were added whilestirring at room temperature for 15 min. The progress ofthe reaction was monitored by TLC with a solution of hexane and ethyl acetate (5:1). The resulting mixture wasquenched by saturated aqueous NaHCO3 and extractedwith dichloromethane after the reaction completed. Th esolid product was recrystallized using chloroform and hexane.A slightly yellow solid product was obtained, whichwas then purified by column chromatography with hexane and ethyl acetate.Two intermediates, the DPS acceptor and the compound 2 donor, were reacted for D1-DPS by theBuchwald-Hartwig amination. Compound 2 (0.5 g,1.38 mmol), DPS (0.48 g, 1.38 mmol), pd(dba)2 (0.008 g,0.014 mmol), t-BuONa (0.27 g, 2.77 mmol), and triphenylphosphine(0.003 g, 0.011 mmol) showed high purityAr charging. Then toluene (20 ml) was added and refluxedfor 5 h at 115 C. Quenching was not required. The resultingmixture was worked up using ethyl acetate and water.A small amount of water in the extracted organic layerwas removed by MgSO4 and filtered with celite to removethe inorganic materials. Finally, column chromatographywas applied with hexane and dichloromethane.The white solid product was recrystallized byhexane.

The synthetic route of 61613-22-7 has been constantly updated, and we look forward to future research findings.

Reference:
Article; Lee, In Hye; Kim, Ki Ju; Kim, Young Kwan; Kim, Young Sik; Shin, Dong Myung; Journal of Nanoscience and Nanotechnology; vol. 19; 8; (2019); p. 4583 – 4589;,
Bromide – Wikipedia,
bromide – Wiktionary

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. 1647-26-3, name is 1-Bromo-2-cyclohexylethane, A new synthetic method of this compound is introduced below., COA of Formula: C8H15Br

General procedure: The alkyl bromide (1.0 equiv) was added to a solution of mercaptoaceticacid (1.0 equiv) in methanol (10.0 mL) and the resultingsolution stirred. Then a solution of NaOH (2.0 equiv) in methanol(5.0 mL)was added slowly, and the final mixturewas stirred at roomtemperature or heated to reflux until absence of the alkyl bromide(checked by TLC). The reaction mixture was concentrated in vacuo,diluted with H2O, and neutralized with 1 N HCl. Then the obtainedreaction mixture was extracted with EtOAc. The combined organicfractions were washed with brine, dried with Na2SO4, and concentratedin vacuo. Purification of the crude residue by column chromatography(petroleum ether/EtOAc) afforded the title compound.

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; Chen, Ying; Wu, Bolin; Hao, Yameng; Liu, Yunqi; Zhang, Zhili; Tian, Chao; Ning, Xianling; Guo, Ying; Liu, Junyi; Wang, Xiaowei; European Journal of Medicinal Chemistry; vol. 171; (2019); p. 420 – 433;,
Bromide – Wikipedia,
bromide – Wiktionary

Electric Literature of 4549-33-1, 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. 4549-33-1 name is 1,9-Dibromononane, 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.

To a stirred solution of mixture of 3,7-bis(tert-butoxycarbonylamino)-2,8-dimethyl-5- phenylphenazin-5-ium chloride and 3,7-bis(tert-butoxycarbonylamino)-2,6-dimethyl-5- phenylphenazin-5-ium chloride (500 mg, 0.909 mmol) in 10 mL of DMF was added cesium carbonate (738 mg, 2.27 mmol) and stirred at RT for 15 min. The reaction mixture was cooled to 0C and 1,9-dibromononane (156 mg, 0.545 mmol, diluted with 1 mL of DMF) was added dropwise. The reaction mixture was stirred at RT for 12 h. The reaction was monitored by TLC and LCMS. After completion of reaction, the mixture was diluted with ice-cold water and filtered. The solid residue obtained after filtration was dissolved in diethyl ether (200 mL) and washed with brine solution (3×50 mL). The ether layer was dried over anhydrous sodium sulfate, concentrated under reduced pressure to afford the crude product which was purified by column chromatography (neutral alumina, eluent 0-20% EtOAc in hexane) to afford the desired product (mixture of 2 products of same mass) as a dark brown solid (400 mg).

At the same time, in my other blogs, there are other synthetic methods of this type of compound, 1,9-Dibromononane, and friends who are interested can also refer to it.

Reference:
Patent; MEDIVATION TECHNOLOGIES, INC.; RAI, Roopa; PHAM, Son Minh; HART, Barry Patrick; (437 pag.)WO2017/19832; (2017); A1;,
Bromide – Wikipedia,
bromide – Wiktionary

Electric Literature of 626-40-4,Some common heterocyclic compound, 626-40-4, name is 3,5-Dibromoaniline, molecular formula is C6H5Br2N, 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.

Compound II-2 (2.51 g, 10 mmol), Compound III (2.06 g, 10 mmol), Pd(OAc)2 (0.22 g, Lmmol), BINAP (2,2,-bisdiphenylphosphino-1,1′-binaphthyl, 0.62g, 1mmol) and t-BuOK (2.24g, 20mmol) plus Into 50 mL of dry 1,2-dimethoxyethane (DME), the reaction mixture was stirred overnight under a nitrogen atmosphere and TLC detection was performed. The reaction is now complete. The reaction mixture was carefully poured into 200 mL of ice water, stirred, extracted with 50 mL of X 3 CH 2 Cl 2 , and the extraction phases were combined. It was washed with 1% dilute hydrochloric acid and brine and dried over anhydrous sodium sulfate. The desiccant is filtered off with suction and the filtrate is evaporated to dryness on a rotary evaporator. The residue was purified using silica gel column chromatography to give compound IV-2.

These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 3,5-Dibromoaniline, its application will become more common.

Reference:
Patent; Guangdong Sai Bo Technology Co., Ltd.; Guo Huijun; (8 pag.)CN108003169; (2018); A;,
Bromide – Wikipedia,
bromide – Wiktionary