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CAS No. : | 152684-30-5 | MDL No. : | MFCD07374968 |
Formula : | C6H5BrN2O3 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | YRVHFGOAEVWBNS-UHFFFAOYSA-N |
M.W : | 233.02 | Pubchem ID : | 15645664 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | H315-H319-H335 | Packing Group: | |
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 |
---|---|---|
81% | With potassium acetate;dichloro(1,1'-bis(diphenylphosphanyl)ferrocene)palladium(II)*CH2Cl2; In 1,4-dioxane; for 2.0h;Reflux; | The mixture of 5-bromo-2-methoxy-3-nitropyridine (5 g, 21 .5 mmol),4,4,4',4',5,5,5',5' -octamethyl-2,2'-bi(1 ,3,2-dioxaborolane) (6.6 g, 25.8 mmol) ,PdCl2(dppf)-CH2Cl2 (500 mg) and potassium acetate (6.3 g, 64.5 mmol) in anhydrous 1 ,4-dioxane (200 ml_) was refluxed for 2h. Then the solvents were removed. The crude product was purified by chromatography on silica gel using petroleumether:EtOAc =10:1 as eluent to afford 2-methoxy-3-nitro-5-(4,4,5,5-tetramethyl-1 ,3,2- dioxaborolan-2-yl)pyridine in 81 % yield (5 g). m/z 281 (M+H)+. |
81% | With palladium bis[bis(diphenylphosphino)ferrocene] dichloride; potassium acetate; In 1,4-dioxane; for 2.0h;Reflux; | The mixture of 5-bromo-2-methoxy-3-nitropyridine (5 g, 21.5 mmol), 4,4,4?,4?,5,5,5?,5?-octamethyl-2,2?-bi(1,3,2-dioxaborolane) (6.6 g, 25.8 mmol), PdCl2(dppf)-CH2Cl2 (500 mg) and potassium acetate (6.3 g, 64.5 mmol) in anhydrous 1,4-dioxane (200 mL) was refluxed for 2 h. Then the solvents were removed. The crude product was purified by chromatography on silica gel using petroleum ether:EtOAc=10:1 as eluent to afford 2-methoxy-3-nitro-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine in 81% yield (5 g). m/z 281 (M+H)+. |
80% | With potassium acetate;(1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; In N,N-dimethyl-formamide; at 80.0℃; | AL 2-Methoxy-3-nitro-5-(4,4,5,5-tetramethyl-L3,2-dioxaborolan-2-yl)pyridine; To a dry flask was added 5-bromo-2-methoxy-3-nitropyridine (1.3 g, 5.0 mmol),4,4,4',4',5,5,5',5'-octamethyl-2,2'-bi(l,3,2-dioxaborolane) (1.6 g, 6.4 mmol), and Pd(dppf)Cl2 (0.2 g, 0.25 mmol). Potassium acetate (1.5 g, 15 mmol) was weighed directly into the flask. The flask was then evacuated and back filled with N2. Anhydrous N,N-dimethylformamide (30 mL) was added and the reaction was heated at 80 0C in an oil bath overnight. The reaction mixture was evaporated to dryness. The residue was dissolved in ethyl acetate (20 mL) and washed with water (20 mL). The organics were dried over sodium sulfate and evaporated to dryness. The resulting material was purified by silica gel chromatography (eluting with 0-50% ethyl acetate in hexane) to yield the product (0.2 g, 15%). ESI-MS m/z calc. 280.12, found 199.1 (MW[-C6Hio]+l)+. Retention time 0.7 minutes. |
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