Day: November 10, 2020

875444-08-9, One of the major reasons is to use measurements of the macroscopic properties of a system, the rate of change in the concentration of reactants or products with time, to discover the sequence of events that occur at the molecular level. 875444-08-9, introduce a new downstream synthesis route.

875444-08-9, Synthesis of (4S,5R)-5-(3,5-bis(trifluoromethyl)phenyl)-3-((4′-fluoro-5′-isopropyl-2′-methoxy-4-(trifluoromethyl)biphenyl-2-yl)d2-methyl)-4-methyl-1,3-oxazolidin-2-one (Compound 176). A solution of 18a (495 mg) in DMF (6 mL) was cooled to -20 C. and a 1M solution of NaHMDS in THF (1.7 mL) was added slowly at <-15 C. Five minutes after the addition was complete, a solution of 17b (480 mg) in DMF (3.5 mL) was added dropwise, keeping the temperature at <-15 C. The reaction was allowed to warm slowly to 16 C. over 2 hr, and stirred for an additional 2 hr. The reaction mixture was diluted with MTBE (200 mL), washed with water (10 mL*2), dilute HCl, then brine, dried (Na2SO4), filtered and the solvent concentrated under reduced pressure to give crude Compound 176. MS m/z=640 (M=H), 662 (M+Na). There are, however, a few established termolecular elementary reactions. The reaction of nitric oxide with oxygen appears to involve termolecular steps. you can also browse my other articles about875444-08-9 Reference£º
Patent; CONCERT PHARMCEUTICALS, INC.; US2008/242711; (2008); A1;,
Oxazolidine – Wikipedia
Oxazolidine | C3H7NO – PubChem

80-65-9, The molecularity of an elementary reaction is the number of molecules that collide during that step in the mechanism. If there is only a single reactant molecule in an elementary reaction, that step is designated as unimolecular. 80-65-9, name is 3-Aminooxazolidin-2-one. A new synthetic method of this compound is introduced below.

General procedure: Following the addition of 4-(4-fluorophenoxy) butyric acid (0.71 g, 3.6 mmol) to 20 mL ofdichloromethane in a 50 mL three-necked round-bottom flask, thesolution was agitated until dissolution. Subsequently, EDCI (0.85 g,4.44 mmol) HOBt (0.6 g, 4.44 mmol) and triethylamine (0.84 g,9.25 mmol) were added in turn at 0 C. Stirring in an ice bath for 1 h,3-amino-2-oxazolidinone (0.37 g, 3.6 mmol) was added again. Thesolutionwas brought to 25 C and stirred overnight. Following TLC,the product was filtered by vacuum and dried under rotary evaporation.The product was a white solid weighing 0.51 g with a yieldof 50.2%.

In every case, we must determine the overall rate law from experimental data and deduce the mechanism from the rate law (and sometimes from other data). you can also browse my other articles about 80-65-9 if you are interested.

Reference£º
Article; Jiang, Kai; Yan, Xinlin; Yu, Jiahao; Xiao, Zijian; Wu, Hao; Zhao, Meihua; Yue, Yuandong; Zhou, Xiaoping; Xiao, Junhai; Lin, Feng; European Journal of Medicinal Chemistry; vol. 194; (2020);,
Oxazolidine – Wikipedia
Oxazolidine | C3H7NO – PubChem

The molecularity of an elementary reaction is the number of molecules that collide during that step in the mechanism., 95530-58-8, If there is only a single reactant molecule in an elementary reaction, that step is designated as unimolecular. 95530-58-8, name is (R)-4-Isopropyloxazolidin-2-one. A new synthetic method of this compound is introduced below.

A mixture of 2-(3-bromo-phenyl)-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid (600 mg, 1.7 mmol), (R)-4-isopropyl-2-oxazolidinone (322 mg, 2.5 mmol), copper(I) iodide (96 mg, 0.5 mmol), N,N-dimethylglycine hydrochloride (140 mg, 1.0 mmol) and potassium carbonate (923 mg, 6.7 mmol) in dimethyl sulfoxide (5 mL) was stirred at 120 C. for 16 h. Then the reaction mixture cooled to room temperature. The reaction mixture was extracted with ethyl acetate (2¡Á150 mL), washed with water (2¡Á50 mL) and saturated aqueous ammonium chloride solution (2¡Á50 mL), dried over anhydrous sodium sulfate and then concentrated in vacuo. Purification by Waters automated flash system (column: Xterra 30 mm¡Á100 mm, sample manager 2767, pump 2525, detector: ZQ mass and UV 2487, solvent system: acetonitrile and 0.1% ammonium hydroxide in water) afforded 2-[3-((R)-4-isopropyl-2-oxo-oxazolidin-3-yl)-phenyl]-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid (555 mg, 80%) as a white solid: LC/MS m/e calcd for C24H28N2O4 (M+H)+: 409.50, observed: 409.1.

Any one of these steps may be slow and thus may serve as the rate determining step. In general, however, in the presence of the catalyst, the overall rate of the reaction is faster than it would be if the reactants were in the gas or liquid phase.

Reference£º
Patent; Chen, Li; Feng, Lichun; Huang, Mengwei; Liu, Yongfu; Wu, Guolong; Wu, Jim Zhen; Zhou, Mingwei; US2011/257151; (2011); A1;,
Oxazolidine – Wikipedia
Oxazolidine | C3H7NO – PubChem

1121-83-1, The molecularity of an elementary reaction is the number of molecules that collide during that step in the mechanism. If there is only a single reactant molecule in an elementary reaction, that step is designated as unimolecular. 1121-83-1, name is 5,5-Dimethyloxazolidin-2-one. A new synthetic method of this compound is introduced below.

To a solution of 6-(6-fluoro-4-iodo-2-pyridyl)-5-methyl-2-pyrimidin-2-yl-7,8-dihydro-5H-pyrido[4,3-d]pyrimidine (the product of step 1 in Example 96, 100 mg, 223 muiotaetaomicron) in dioxane (3mL) was added 5,5-dimethyloxazolidin-2-one (51.4 mg, 446 muiotaetaomicron), cesium carbonate (145 mg, 446 muiotaetaomicron), Xantphos (25.8 mg, 44.6 muiotaetaomicron) and Pd(OAc)2(5.01 mg, 22.3 muiotaetaomicron). The reaction mixture was heated at 100 C with stirring for 20 hrs under Ar. After being cooled to rt, the resulting mixture was filtered and the filtrate was concentrated in vacuo. The residue was purified by prep-HPLC to give 3-[2-Fluoro-6-(5-methyl-2-pyrimidin-2-yl-7,8-dihydro-5H-pyrido [4,3-d]pyrimidin-6-yl)-4-pyridyl]-5,5-dimethyl-oxazolidin-2-one (8 mg) as a light yellow solid. 1H NMR (400MHz, DMSO-<) delta ppm: 8.99 (d, 2H), 8.95 (s, 1H), 7.64 (t, 1H), 6.72 (s, 6.70 (s, 1H), 5.71-5.66 (m, 1H), 4.51 - 4.40 (m, 1H), 3.93 (s, 2H), 3.56 - 3.44 (m, 1H), 3.12 - 2.97 (m, 2H), 1.53 (d, 3H), 1.49 (d, 6H). MS obsd (ESI) [(M+H)+]: 436. In every case, we must determine the overall rate law from experimental data and deduce the mechanism from the rate law (and sometimes from other data). you can also browse my other articles about 1121-83-1 if you are interested. Reference£º
Patent; F. HOFFMANN-LA ROCHE AG; HOFFMANN-LA ROCHE INC.; CHENG, Zhanling; HAN, Xingchun; JIANG, Min; WANG, Jianhua; WANG, Yongguang; YANG, Song; (211 pag.)WO2018/1952; (2018); A1;,
Oxazolidine – Wikipedia
Oxazolidine | C3H7NO – PubChem

99395-88-7, (S)-4-Phenyloxazolidin-2-one is a oxazolidine compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

In anhydrous and oxygen-free environment, 36g of 4-[2-(4-fluoro-phenyl)-[1,3]dithiacyclolan-2-yl]-butyric acid (IV) was added and 300ml of dichloromethane was added. Add 50ml triethylamine,A mixture of 20 ml of pivaloyl chloride and 50 ml of tetrahydrofuran was added dropwise at a temperature of -20C to -10C and reacted for 2 hours. Add 6.4g of anhydrous lithium chloride and stir for 2 hours.27g 4-phenyl-2-oxazolidone was added and the reaction mixture was stirred for 5-7 h.The intermediate VI was extracted and crystallized. The yield was 96.1%., 99395-88-7

99395-88-7 (S)-4-Phenyloxazolidin-2-one 730424, aoxazolidine compound, is more and more widely used in various fields.

Reference£º
Patent; Shandong New Age Pharmaceutical Co., Ltd.; Zhang Guimin; Zang Chao; Xia Mingjun; (16 pag.)CN107488190; (2017); A;,
Oxazolidine – Wikipedia
Oxazolidine | C3H7NO – PubChem

90319-52-1, (R)-4-Phenyloxazolidin-2-one is a oxazolidine compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

To a solution of Preparation 11-1(1.4g. 4.8 mmoi) in THF (15 mL) was added NEt3 (1.3 mL, 9.6 mmoi). The reaction mixture was cooled to 0 ¡ãC and trimethylacetyl chloride (0.7 13 inL, 5.8 mmoi) was added dropwise and the resulting solution stirred for 30 mm at 0 ¡ãC. In a separate flask, (R)-4-phenyioxazolidin-2-one (3. 101 g, 6.24 mmoi) in THF (45 rnL) at 0¡ãC was treated with 1 M Lil-{MDS solution in THF (dropwise addition of 624 mL, 6.24 mmoi) and stirred at 0¡ãC. The lithiate was added via cannula to the first flask. The reaction mixture was allowed to warm to rt and was stirred fbr 3 hours. LC/MS indicated the complete consumption of the starting carboxylic acid and formation of the desired imide. The reaction mixture was poured onto saturated aqueous ammoniurn chloride (50 mL) and the layers were separated. The aqueous layer was extracted with EtOAc (3 x 50 mL). The combined organic extracts were dried over anhydrous sodium sulfate and chromatographed on silica using EtOAc/Hexanes 0 to 100percent gradient to give Preparation 11 as a white foam in 83percent yield, rn/z M¡ÀH) = 433.3. H-NMR (400 Ml-Iz; CDCl): 8.80 (d, J::: 4.5 Hz, 1H, 8.11 (dd, J:::: 9.1, 5.7 Hz, 1H). 7.63 (dd, J 10.5, 2.5 Hz. 1H), 7.48-7.43 (in, IH), 7.40-7.30 (m, 6H), 5.47-5.44 (m, 1H), 4.71 (t, J= 8.9 Hz, 1H). 4.31- 4.28 (m. 1FI). 3.20-3.11 (in, 3H). 2.49-2.46 (m, IH), 1.82-1.67 (in. 6H)., 90319-52-1

As the paragraph descriping shows that 90319-52-1 is playing an increasingly important role.

Reference£º
Patent; BRISTOL-MYERS SQUIBB COMPANY; CHERNEY, Emily Charlotte; SHAN, Weifang; ZHANG, Liping; NARA, Susheel Jethanand; HUANG, Audris; BALOG, James Aaron; (129 pag.)WO2018/39512; (2018); A1;,
Oxazolidine – Wikipedia
Oxazolidine | C3H7NO – PubChem

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.90319-52-1,(R)-4-Phenyloxazolidin-2-one,as a common compound, the synthetic route is as follows.

General procedure: To a solution of 15a (19.0 g, 107 mmol) in THF (300 mL) cooled to -78 C was added n-butyllithium (47.2 mL, 118 mmol, 2.5 M solution in hexane) dropwise. The resulting solution was stirred at this temperature for 20 min before the dropwise addition of propionic anhydride (15.1 mL, 118 mmol). The cooling bath was removed, and the flask was allowed to slowly warm to room temperature and stir for an additional hour whereupon LCMS indicated reaction completion. The reaction was quenched with the addition of sat. NH4Cl. Volatiles were removed in vacuo, and the resulting residue was diluted with DCM. The layers were separated, and the organic layer was washed with water x 2, 1 M NaOH, brine, dried over MgSO4, filtered, and concentrated in vacuo to afford the desired product as a white solid (23.6 g, 94% yield). Spectral data were in accordance with reported literature values.3, 90319-52-1

90319-52-1 (R)-4-Phenyloxazolidin-2-one 730425, aoxazolidine compound, is more and more widely used in various fields.

Reference£º
Article; Reed, Carson W.; Fulton, Mark G.; Nance, Kellie D.; Lindsley, Craig W.; Tetrahedron Letters; vol. 60; 10; (2019); p. 743 – 745;,
Oxazolidine – Wikipedia
Oxazolidine | C3H7NO – PubChem

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.99395-88-7,(S)-4-Phenyloxazolidin-2-one,as a common compound, the synthetic route is as follows.

To (S)- (+)-4-PHENYL-2-OXAZOLIDINONE (9.88 g, 60 mmol) in THF (150 mL) AT-78C, was added n-butyl lithium (37.7 mL, 1. 6M in hexanes, 60 mmol) over a period of 30 minutes. THF (50 mL) was added to the resultant thick suspension and the reaction mixture allowed to warm up to facilitate stirring. Trans-cinnamoylchloride (11.5 g, 69 mmol) in THF (30 mL) was added dropwise. The’reaction was stirred at room temperature overnight. The reaction mixture was quenched with a saturated ammonium chloride solution (50. ML) and stirred for 0.5h. The solvent was removed in vacuo, the residue dissolved in ethyl acetate, washed with water (300 mL), 5% sodium bicarbonate (200 mL) and brine (100 mL) and dried over sodium sulfate. The solvent was removed in vacuo to give a pale yellow solid. The compound was crystallized from ETHYLACETATE and washed with hexanes to give 17.12 g (97%) of (S)-4- PHENYL-3- [ (E)- (3-PHENYL-ACRYLOYL)]-OXAZOLIDIN-2-ONE. H NMR (400 MHz, CDC13) : 8 [ppm] 7.92 (d, 1H), 7. 77 (d, 1H), 7.59 (m, 2H), 7.40-7. 35 (m, 8H), 5.55 (dd, 1H), 4.74 (t, 1H) ; 4.31 (DD,. 1H)., 99395-88-7

The synthetic route of 99395-88-7 has been constantly updated, and we look forward to future research findings.

Reference£º
Patent; VIROCHEM PHARMA INC.; WO2005/23809; (2005); A1;,
Oxazolidine – Wikipedia
Oxazolidine | C3H7NO – PubChem

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.90319-52-1,(R)-4-Phenyloxazolidin-2-one,as a common compound, the synthetic route is as follows.

To a solution of bromoethynylbenzene (1.4 g, 8.0 mmol) in 24 mL of anhydrous toluene in a reaction vial were added methyl phenylcarbamate (1.5 g, 9.6 mmol), K3PO4 (3.4 g, 16 mmol), copper sulfate-pentahydrate (400 mg, 16 mmol), and 1,10-phenanthroline (577 mg, 3.2 mmol). The reaction mixtures was capped under an argon atmosphere, and heated in an oil bath at 80 ?C for 15 h. The progress of the reaction was monitored using TLC analysis. Upon completion, the reaction mixture was allowed to cool to room temperature, and diluted with 15 mL of ethyl acetate. The mixture was filtered through a pad of celite, and the filtrate was concentrated in vacuo. The crude residue was purified by column chromatography with eluent of Hexane/ ethyl acetate = 19/1 to give 1.6 g of 1 in 80 percent yield as a yellow oil. 1H NMR (400 MHz, CDCl3) delta 7.55 (dd, J = 1.2, 8.6 Hz, 2H), 7.45-7.40 (m, 4H), 7.33-7.28 (m, 4H), 3.92 (s, 3H). 13C NMR. (100 MHz, CDCl3) delta 154.9, 139.7, 131.5, 129.1, 128.4, 128.0, 127.2, 124.8, 123.0, 83.0, 70.3, 54.5.#10;, 90319-52-1

As the paragraph descriping shows that 90319-52-1 is playing an increasingly important role.

Reference£º
Article; Sato, Akihiro H.; Ohashi, Kazuhiro; Iwasawa, Tetsuo; Tetrahedron Letters; vol. 54; 10; (2013); p. 1309 – 1311;,
Oxazolidine – Wikipedia
Oxazolidine | C3H7NO – PubChem

With the rapid development and complex challenges of chemical substances, new drug synthesis pathways are usually the most effective.99395-88-7,(S)-4-Phenyloxazolidin-2-one,as a common compound, the synthetic route is as follows.

(2) nitrogen protection, will (S)-4 – phenyl -2 oxazolidone (2.5 kg, 15.3 muM) is added to the in tetrahydrofuran (20L), stirring and dissolving, control the temperature of the reaction solution in the 15 – 25 C, batch repeatedly added 60% NaH (625g, 15.6 muM). Feeding after completely, adds by drops differently pivaloyl chloride (1.9 kg, 15.8 muM), to maintain the temperature of the reaction solution is lower than the 30 C. Dropping after completely, thermal insulation reaction 30min. TLC monitoring raw material the reaction is complete. The reaction liquid slowly poured into saturated NH4Cl (40L) in aqueous solution quenching, and the room temperature stirring reaction 2h, layered, separating the organic phase, the aqueous layer and then the extraction of ethyl acetate (15L ¡Á 2), the combined organic layer, steaming and to dry. In the concentrate is added to the petroleum ether (4L), full mixing, filtering, results in the type (I – S) compound of formula 3.41 kg. The yield is 90%.

99395-88-7, As the paragraph descriping shows that 99395-88-7 is playing an increasingly important role.

Reference£º
Patent; Borui Bio-pharmaceutical (Suzhou) Co., Ltd.; Yuan Jiandong; Liu Wei; Ma Shimin; (29 pag.)CN104058990; (2017); B;,
Oxazolidine – Wikipedia
Oxazolidine | C3H7NO – PubChem