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CAS No. : | 151230-42-1 | MDL No. : | MFCD06659628 |
Formula : | C8H6BrNO | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | ZCGXHOLCXPKKBO-UHFFFAOYSA-N |
M.W : | 212.04 | Pubchem ID : | 10036077 |
Synonyms : |
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Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | N/A |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium acetate;palladium diacetate; tris-(o-tolyl)phosphine; In N,N-dimethyl-formamide; at 150.0℃; for 1.0h;Inert atmosphere; Microwave irradiation; | A mixture of 1.0 mmol of <strong>[151230-42-1]6-bromo-2-methyl-benzooxazole</strong> [151230-42-1], 2 mmol of acrylonitrile, 1.0 mmol of sodium acetate, 0.1 mmol of Pd(OAc)2 and 0.2 mmol of P(o-tolyl)3 in 3 ml of DMF under N2 atmosphere is treated at 1500C for 1 h in the <n="35"/>microwave. The reaction is filtered through a short plug of Hyflow. The solvent of the filtarate is concentrated by evaporation. The title compound is obtained from the residue by chromatography on Varian Mega Bond Elut (Si) eluting with EtOAc to a mixture of petroleum ether/EtOAc 10:1 to afford the title compound as a mixture of cis and trans geometric isomers. Rf = 0.15 (CH2CI2-MeOH 100:2); Rt = 4.48. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
81% | With potassium phosphate;tetrakis(triphenylphosphine) palladium(0); In 1,4-dioxane; water; at 150.0℃; for 0.666667h;Inert atmosphere; Microwave irradiation; | To a solution of Compound 24 (480 mg, 2.264 mmol) in 1,4-dioxane (7 mL) were added TETRAKIS(TRIPHENYLPHOSPHINE) PALLADIUM (0) (183 mg, 0.158 mmol), PHENYLBORONIC ACID (414 mg, 3.40 mmol) and 2M aqueous potassium phosphate solution (3.4 ml, 6.8 mmol) under nitrogen atmosphere at room temperature, then the reaction mixture was stirred at 150 C. for 40 minutes under microwave irradiation. To the reaction solution was added 1N hydrochloric acid, then the reaction solution was extracted with ethyl acetate. The extraction was washed with brine and dried over sodium sulfate. The solvent was removed under reduced pressure. The obtained residue was purified by column chromatography to give Compound 25 (385 mg, 81%).Compound 25; 1H-NMR (DMSO-d6) delta: 2.64 (s, 3H), 7.38 (dd, J=8.4, 2.0 Hz, 1H), 7.47-7.51 (m, 2H), 7.64 (d, J=2.0 Hz, 1H), 7.77-7.75 (m, 3H), 7.96 (s, 1H) |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
85% | With acetic acid; for 0.5h;Reflux; | To an AcOH (1.521 mul, 0.027 mmol) were added 2-amino-5-bromophenol 23 (500 mg, 2.66 mmol) and 1,1,1-trimethoxyethane (600 mul, 4.79 mmol), then the reaction mixture was refluxed for 30 minutes. To the reaction solution was added water, then the reaction solution was extracted with ethyl acetate. The extraction was washed with brine and dried over magnesium sulfate. The solvent was removed under reduced pressure. The obtained residue was purified by column chromatography to give Compound 24 (481 mg, 85%).Compound 24; 1H-NMR (CDCl3) delta: 2.63 (s, 3H), 7.42 (dd, J=8.62, 2.03 Hz, 1H), 7.51 (d, J=8.62 Hz, 1H), 7.64 (d, J=2.03 Hz, 1H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
88.5% | With 1,3-dibromo-5,5-dimethylimidazolidine-2,4-dione; at 25.0℃; for 0.166667h; | 2-Amino-5-bromophenol (561 mg, 3.00 mmol)Was added to triethyl orthoacetate (656 muL, 3.6 mmol),1,3-Dibromo-5,5-dimethylhydantoin (17.2 mg, 6.00 × 10 -2 mmol) was added,And the mixture was stirred at room temperature for 10 minutes.And extracted with ethyl acetate (50 mL × 2).The organic layer was washed with saturated brine,After dehydration with anhydrous magnesium sulfate,The solvent was distilled off under reduced pressure,The residue was subjected to silica gel column chromatography using ethyl acetate / hexane (1/4 (volume ratio)) as an elution solvent,Compound 16 was obtained in a yield of 560 mg (88.5%). |
65% | With acetic acid; for 0.5h;Reflux; | To 2-amino-5- bromophenol ( l .OOg, 5.32 mmol) , acetic acid ((0.006 ml) and triethylorthoacetate ( 1.75 ml, 9.58 mmol) were added and refluxed for 3o min. The reaction mixture was quenched with water, extracted with ethyl acetate, dried over sodium sulphate and concentrated. The crude product was column chromatographed with ethyl acetate : petroleum ether to afford the title compound as a orange solid ((0.756 g, 65%). -NMR (delta ppm, CDC13, 400 MHz): delta 7.64 (d, 7 = 1.7 Hz, 1 H), 7.51 (d, 7 = 8.4 Hz, 1 H), 7.43 (dd, 7 = 8.4, 1.7 Hz, 1 H), 2.67 (s, 3H). |
65% | With acetic acid; for 0.5h;Reflux; | Intermediate 126 6-bromo-2-methylbenzo[d]oxazole: To 2-amino-5-bromophenol (1.00 g, 5.32 mmol), acetic acid ((0.006 ml) and triethylorthoacetate (1.75 ml, 9.58 mmol) were added and refluxed for 30 min. The reaction mixture was quenched with water, extracted with ethyl acetate, dried over sodium sulphate and concentrated. The crude product was column chromatographed with ethyl acetate: petroleum ether to afford the title compound as a orange solid ((0.756 g, 65%). 1H-NMR (delta ppm, CDCl3, 400 MHz): delta 7.64 (d, J=1.7 Hz, 1H), 7.51 (d, J=8.4 Hz, 1H), 7.43 (dd, J=8.4, 1.7 Hz, 1H), 2.67 (s, 3H). |
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