Tag: M.W:100-200

As a common heterocyclic compound, it belongs to benzoxazole compound, name is 5-Methylbenzo[d]oxazole-2(3H)-thione, and cas is 22876-22-8, its synthesis route is as follows.,22876-22-8

INVENTIVE EXAMPLE 35 5-Methyl-2-(4-methyl-1-homopiperazinyl)benzoxazole 5-Methyl-2-mercaptobenzoxazole (200 mg) was dissolved in chloroform (20 ml), N-methylhomopiperazine (1.24 ml) was added dropwise to the solution and then the mixture was stirred with heating for 2 days. After evaporation of the solvent, the thus obtained mixture was purified by a silica gel column chromatography (methylene chloride_methanol=10:1) to obtain the title compound 5-methyl-2-(4-methyl-1-homopiperazinyl)benzoxazole (124 mg).

With the complex challenges of chemical substances, we look forward to future research findings about 22876-22-8,belong benzoxazole compound

Reference£º
Patent; Meiji Seika Kaisha, Ltd; Koichi Shudo; US6037342; (2000); A;,
Benzoxazole – Wikipedia
Benzoxazole | C7H5NO – PubChem

Benzo[d]oxazol-2-amine, cas is 4570-41-6, it is a common heterocyclic compound, the benzoxazole compound, its synthesis route is as follows.,4570-41-6

Example P (0342) 4-((Benzo[d]oxazol-2-yl(5-fluoropyridin-2-yl)amino)methyl)-N- (0343) 2-Bromo-5-fluoropyridine (1 ) (1.0g, 5.71 mmol), benzo[d]oxazol-2-amine (2) (766mg, 5.71 mmol), Xantphos (0.33g, 0.57mmol) and Cs2C03 (2.79g, 8.56mmol) were combined in dry 1 ,4-dioxane (15mL). The reaction mixture was degassed with N2(g) and placed under vacuum for 10min. Pd2(dba)3 (0.261 g, 0.28mmol) was then added and the resulting reaction mixture was heated at 90¡ãC for 30h. It was then poured onto demineralised water (200ml_) and extracted with EtOAc (3 x 100ml_). The organic phases were combined, dried over Na2S04, filtered and subsequently concentrated in vacuo. The resulting residue was purified by flash chromatography with EtOAc/Hexane (1 :1) to provide N-(5-fluoropyridin-2-yl)benzo[d]oxazol-2-amine (3) as a yellow solid (0.6g, 46percent). (0344) LCMS (ES): Found 230.1 [M+H]+.

4570-41-6 is used more and more widely, we look forward to future research findings about Benzo[d]oxazol-2-amine

Reference£º
Patent; KARUS THERAPEUTICS LTD; SHUTTLEWORTH, Stephen Joseph; WHALE, Andrew David; COLMAN, Lucy Mary; ROGERS, Helen Louise; (117 pag.)WO2017/208032; (2017); A1;,
Benzoxazole – Wikipedia
Benzoxazole | C7H5NO – PubChem

22876-19-3, 5-Chlorobenzo[d]oxazole-2(3H)-thione is a benzoxazole compound, ?involved in a variety of chemical synthesis. Rlated chemical reaction is continuously updated

Oxalyl chloride (1.20 g, 9.4 mmol) was added dropwise to a stirred suspension of 2- mercapto-5-chlorobenzoxazol (1.28 g, 6.9 mmol) in CH2C12 (37 mL) at < 20C. DMF (4.59 g, 62.8 mmol) was added dropwise. A vigorous gas formation was observed and the suspension turned into a solution halfway throughout the addition. The reaction mixture was stirred for 20 minutes. Two additional aliquots oxalyl chloride (1 : 0.20g, 1.35 mmol; 2: 0.40 g, 2.70 mmol) were added and the reaction mixture was stirred for 1.5 hours. HPLC indicated complete conversion of 2-mercapto-5-chlorobenzoxazol into 2,5- Dichlorobenzoxazol ., 22876-19-3

As the paragraph descriping shows that 22876-19-3 is playing an increasingly important role.

Reference£º
Patent; SANDOZ AG; BARTH, Roland; HOeFERL-PRANTZ, Kathrin; RICHTER, Frank; WIDSCHWENTER, Gerhard; (166 pag.)WO2016/20405; (2016); A1;,
Benzoxazole – Wikipedia
Benzoxazole | C7H5NO – PubChem

As a common heterocyclic compound, it belongs to benzoxazole compound, name is 5-Bromobenzo[d]oxazole, and cas is 132244-31-6, its synthesis route is as follows.,132244-31-6

General procedure: To an oven dried 25 mL round bottom flask, palladium complex (7 mg, 3 mol %), silver(I) oxide (229 mg, 1 mmol) and aryl propiolic acid (1 mmol), under air, were added. Azole substrate (0.5 mmol) in DMF (4 mL) was added to the reaction mixture. The reaction mixture was stirred at 80 C for 6-8 h. The reaction mixture was diluted with EtOAc then filtered through filter paper. The filtrate was quenched with Ice cold water and then, aqueous layer was extracted with EtOAc. The organic phase was washed with NaCl (satd aq), dried with Na2SO4, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography.

With the complex challenges of chemical substances, we look forward to future research findings about 132244-31-6,belong benzoxazole compound

Reference£º
Article; Parsharamulu, Thupakula; Vishnuvardhan Reddy, Police; Likhar, Pravin R.; Lakshmi Kantam, Mannepalli; Tetrahedron; vol. 71; 13; (2015); p. 1975 – 1981;,
Benzoxazole – Wikipedia
Benzoxazole | C7H5NO – PubChem

Name is 6-Nitrobenzo[d]oxazole, as a common heterocyclic compound, it belongs to benzoxazole compound, and cas is 17200-30-5, its synthesis route is as follows.,17200-30-5

General procedure: A mixture of VNU-11(Hf) (0.018 g, 0.01 mmol), aromatic acylchloride (0.140 g, 1 mmol) and benzoxazole (0.119 g, 1 mmol)was heated at 170 C under conventional heating for a few hoursor microwave irradiation of a CEM Discover apparatus for a fewminutes. After completion of reaction, the catalyst was filteredfrom the reaction mixture. The filtrate was diluted with ethyl acetate (50 mL), washed with H2O (3×20 mL), aqueous NaHCO3(2 x20 mL), and dried over Na2SO4. The solvent was removed ina rotary evaporator. The crude product was purified by flash chromatography(90:10 acetone/petroleum ether to give correspondingproduct. The purity and identity of the products were confirmed byGC-MS spectra, which were compared with the spectra in the NISTlibrary, and by 1H and 13C NMR spectroscopy.

With the complex challenges of chemical substances, we look forward to future research findings about 6-Nitrobenzo[d]oxazole

Reference£º
Article; Nguyen, Linh Ho Thuy; Nguyen, Trang Thi Thu; Tran, Phuong Hoang; Kawazoe, Yoshiyuki; Le, Hung Minh; Doan, Tan Le Hoang; Journal of Catalysis; vol. 374; (2019); p. 110 – 117;,
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Benzoxazole | C7H5NO – PubChem

2-(Methylthio)benzo[d]oxazole, cas is 13673-62-6, it is a common heterocyclic compound, the benzoxazole compound, its synthesis route is as follows.,13673-62-6

Example 6 N-(2-benzoxazolyl)-O-[4-oxo-4-[(1,4,5,6-tetrahydro-2-pyrimidinyl)amino]butyl]-L-tyrosine (1,1-dimethyl ethyl) N-(2-benzoxazolyl)-O-(4-ethoxy-4-oxobutyl)-L-tyrosinate (6-1) A mixture constituted by aminoester 5-3 (1.05 g, 3 mmole), 2-methylthiobenzoxazole (660 mg, 4 mmoles) and HgCl2 (50 mg) is heated at 140 C. for 4 hours. The mixture obtained after cooling down is purified by chromatography eluding with a heptane/AcOEt mixture 50/50. 370 mg of the expected product 6-1 is obtained. IR (CHCl3) NH 3413 cm-1; C=O 1729 cm-1; Heterocycle+Aromatic 1642, 1612, 1582, 1512 cm-1

With the rapid development of chemical substances, we look forward to future research findings about 2-(Methylthio)benzo[d]oxazole

Reference£º
Patent; Demassey, Jacques; Gourvest, Jean-Francois; Ruxer, Jean-Marie; Weston, John Bernard; LeFrancois, Jean-Michel; US2004/225111; (2004); A1;,
Benzoxazole – Wikipedia
Benzoxazole | C7H5NO – PubChem

Name is 5-Methyl-2-aminobenzoxazol, as a common heterocyclic compound, it belongs to benzoxazole compound, and cas is 64037-15-6, its synthesis route is as follows.,64037-15-6

To a 50 ml three-necked flask was added 5-methylbenzoxazol-2-amine, 10 ml of tetrahydrofuran, 5 ml of triethylamine. The acid chloride was then dissolved in 10 ml of dry tetrahydrofuran, Below 5 deg C under the conditions of slow drop, The reaction was stirred at room temperature for 4 h. 40 ml of saturated aqueous sodium chloride solution was added,The aqueous phase was extracted three times with 25 ml of dichloromethane, Combine the organic phase. Column separation, Dichloromethane: methanol 60: 1 to give 1.39 g of a white solid, M.p. 174 to 176 C, yield: 70.6%.

With the complex challenges of chemical substances, we look forward to future research findings about 5-Methyl-2-aminobenzoxazol

Reference£º
Patent; Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences; Si, Shuyi; Gao, Nana; Jiang, Wei; Jiang, Jiandong; Li, Yan; Li, Dongsheng; Li, Yongzhen; Zhang, Jing; Zhu, Ningyu; Wang, Zhimin; (20 pag.)CN103772376; (2017); B;,
Benzoxazole – Wikipedia
Benzoxazole | C7H5NO – PubChem

Name is 2-(Chloromethyl)benzo[d]oxazole, as a common heterocyclic compound, it belongs to benzoxazole compound, and cas is 41014-43-1, its synthesis route is as follows.,41014-43-1

Step E Preparation of 3-[(benzoxazol-2-yl)methoxy]-2-methoxy-5-ethyl-6-methylpyridine A quantity of 60% sodium hydride in mineral oil (24 mg, 0.6 mmol) was added to a solution of 2-methoxy-3-hydroxy-5-ethyl-6-methylpyridine (77 mg, 0.46 mmol) in dry dimethylformamide (2 mL). After gas evolution ceased, 2-(chloromethyl) benzoxazole (100 mg, 0.6 mmol) was added and the reaction mixture warmed at 60 C. for one hour. The reaction was then cooled, diluted with diethyl ether, the ether extract washed with water, dried (Na2 SO4), filtered and evaporated to give 151 mg of crude mixture. This mixture was flash chromatographed on silica gel, eluding with 0.5% methanol/chloroform. Combined appropriate fractions gave 46 mg (32%) of oily product.

With the complex challenges of chemical substances, we look forward to future research findings about 2-(Chloromethyl)benzo[d]oxazole

Reference£º
Patent; Merck & Co., Inc.; US5308854; (1994); A;,
Benzoxazole – Wikipedia
Benzoxazole | C7H5NO – PubChem

As a common heterocyclic compound, it belongs to benzoxazole compound, name is Benzo[d]oxazol-2-amine, and cas is 4570-41-6, its synthesis route is as follows.,4570-41-6

300 mg of (R)-tert-butyl 3-(4-amino-3-iodo-1H-pyrazolo[3,4-d]pyrimidin-1-yl)piperidine-1-carboxylate obtained in Synthetic Example 1 was dissolved in 3 mL of NMP. 118 mg of benzo[d]oxazol-2-amine, 20 mg of xantphos, and 0.15 mL of N-methylmorpholine were added thereto, and a degassing operation was carried out. Thereafter, 7.6 mg of palladium acetate was added thereto, and under a carbon monoxide atmosphere, the mixture was heated to 110¡ã C. and stirred for 2 hours. After the mixture was cooled, 4.5 mL of methanol and 0.45 mL of a 5 N aqueous solution of sodium hydroxide were added thereto, and the mixture was stirred for 30 minutes at room temperature. Thereafter, the pH was adjusted to 5.3 with 2 N hydrochloric acid, and a solid thus obtained was collected by filtration. The crude product was purified by a silica gel column (chloroform-methanol), and thus 257 mg of the title compound was obtained as a white solid. (0529) Physical property value: m/z [M+H]+ 479.3

With the complex challenges of chemical substances, we look forward to future research findings about 4570-41-6,belong benzoxazole compound

Reference£º
Patent; TAIHO PHARMACEUTICAL CO., LTD.; Hosoi, Fumihito; Nakachi, Yoshinori; Kajiwara, Daisuke; (63 pag.)US9782412; (2017); B2;,
Benzoxazole – Wikipedia
Benzoxazole | C7H5NO – PubChem

Name is 4-Aminobenzo[d]oxazol-2(3H)-one, as a common heterocyclic compound, it belongs to benzoxazole compound, and cas is 81900-93-8, its synthesis route is as follows.,81900-93-8

Commercially available p-chlorobenzylamine (1.6 g, 1 1.4 mmol) was dissolved in 60ml of AcOEt and at 0C triphosgene (3.38 g, lequiv.) was added to the solution. The mixture was warmed at 80C for 4 hours then evaporated and the residue was dissolved in 30 ml of DMF. The solution of the isocyanate was added dropwise to a solution in DMF (10 ml) of compound lb (1.7 g, 1 1.4 mmol) and the mixture was warmed at 80C for 8 hours. (TLC AcOEt 7 / petroleum ether 3). The solvent was evaporated and the crude was dissolved in AcOEt (80 ml) and washed with water (1 X 50 ml) and brine. The organic phase was dried over sodium sulfate and concentrated under vacuum. The purification of the crude residue by chromatographic column gave 500mg of a white solid. Yield = 14% ‘HNMR (DMSO, 200 MHz) delta 4.57 (2H, d, J = 5.8 Hz), 6.53 (2H, m), 7.04 (1H, m), 7.41 (4H, s), 9.88 (1H, t), 1 1.53 (1H, s), 1 1.80 (1H, bs); [M+1] 318.5 (C15H12ClN3O3 requires 317.73).

With the complex challenges of chemical substances, we look forward to future research findings about 4-Aminobenzo[d]oxazol-2(3H)-one

Reference£º
Patent; PHARMESTE S.R.L.; NAPOLETANO, Mauro; TREVISANI, Marcello; PAVANI, Maria Giovanna; FRUTTAROLO, Francesca; WO2011/120604; (2011); A1;,
Benzoxazole – Wikipedia
Benzoxazole | C7H5NO – PubChem