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CAS No. : | 15862-31-4 | MDL No. : | MFCD00955628 |
Formula : | C5H4BrN3O2 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | OFXNHXMPRZDIDM-UHFFFAOYSA-N |
M.W : | 218.01 | Pubchem ID : | 2734412 |
Synonyms : |
|
Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P280-P305+P351+P338 | UN#: | |
Hazard Statements: | H302-H315-H319-H332-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 |
---|---|---|
32% | Stage #1: at 20℃; Stage #2: With sodium hydrogencarbonate In water; ethyl acetateSaturated solution |
Step a: 3-Bromo-5-nitropyridin-2-amine To a solution of 5-nitro-pyridin-2-ylamine (30 g, 0.22 mol) in acetic acid (200 mL) at 10° C. was added Br2 (38 g, 0.24 mol) dropwise. After addition, the mixture was stirred at 20° C. for 30 min. The solid was filtered and then dissolved in ethyl acetate (200 mL). The mixture was basified to pH 8-9 with saturated aqueous NaHCO3. The organic layer was separated, and the aqueous layer was extracted with ethyl acetate (100 mL*3). The combined organic layers were washed with water, brine, dried over Na2SO4 and concentrated under vacuum to afford 3-bromo-5-nitropyridin-2-amine (14.8 g, 32percent). 1H-NMR (CDCl3, 400 MHz) δ 8.94 (d, J=2.4 Hz, 1H), 8.50 (d, J=2.4 Hz, 1H), 5.67 (brs, 2H). |
31% | With N-Bromosuccinimide In toluene at 80℃; for 1 h; Inert atmosphere | General procedure: Under an Ar atmosphere, N-chlorosuccinimide (0.53 g,3.95 mmol) was added to a solution of compound 1 (0.50 g,3.59 mmol) in anhydrous toluene (7.18 mL). The resulting reactionmixture was stirred at 80 C for 1 h. The reaction mixture wascooled to room temperature and 15 mL of H2O was added to thismixture. It was then extracted with EtOAc, washed with sat.NaHCO3 solution, brine, concentrated under vacuum, and purifiedby column chromatography (KANTO 60 N, Hex/EtOAc = 80/20 to60/40) to give a yellow solid 2a (0.40 g, 2.30 mmol, 64percent). |
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