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CAS No. : | 1835-02-5 | MDL No. : | MFCD03425186 |
Formula : | C10H11BrO3 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | - |
M.W : | 259.10 | Pubchem ID : | - |
Synonyms : |
|
Signal Word: | Danger | Class: | 8 |
Precautionary Statements: | P260-P264-P270-P280-P301+P330+P331-P303+P361+P353-P304+P340-P305+P351+P338-P310-P363-P405-P501 | UN#: | 3261 |
Hazard Statements: | H302-H314 | Packing Group: | Ⅱ |
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 |
---|---|---|
General procedure: A stirred mixture of <strong>[90008-50-7]3-amino-6-propoxypyridazine</strong> 3 (4.50g, 29.4mmol), 2-bromo-1-[4-(2-methoxyethoxy)phenyl]ethanone 11 (8.03g, 29.4mmol) and EtOH (280mL) was heated at reflux for 2.5 hours. The mixture was cooled and NaHCO3 (2.50g, 30mmol) was added. The mixture was stirred at room temperature for 15 hours, heated at reflux for 1 hour, then cooled and evaporated. The residue was extracted with CHCl3 (150mL) and the extract washed with saturated, aqueous NaCl solution (50mL), dried (MgSO4) and evaporated. The residue was purified by flash chromatography over silica gel. Elution with 1-2% MeOH in CH2Cl2 afforded a green/brown solid. Treatment with decolourising charcoal and recrystallization from cyclohexane gave 6f (3.95g, 41%) as pale green crystals, m.p. 82.5-84C. 1H NMR (CDCl3) ? 1.06 (3H, t, J=7.2Hz), 1.75-1.94 (2H, m), 3.47 (3H, s), 3.74-3.81 (2H, m), 4.14-4.21 (2H, m), 4.27 (2H, t, J=6.6Hz), 6.68 (1H, d, J=9.3Hz), 7.00 (2H, d, J=8.8Hz), 7.76-7.88 (3H, m), 7.94 (1H, s). MS (APCI+) m/z 328 (M+H, 100%). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With potassium carbonate; In acetone; at 20℃; | To a mixture of 2-bromo-1-(3,4-dimethoxyphenyl)ethanone (1.95 g, 7.53 mmol) and <strong>[5932-27-4]ethyl 1H-pyrazole-3-carboxylate</strong> (1.22 g, 8.72 mmol) in acetone (36 mL) at room temperature was added potassium carbonate (1.28 g, 9.23 mmol). Mixture stirred vigorously overnight and then was concentrated under reduced pressure. Resulting residue was taken up in ethyl acetate and washed with 4:1 water/brine. Layers were separated and aqueous was extracted with ethyl acetate. Combined organic layers were dried (Na2SO4), filtered, and concentrated under reduced pressure. Resulting residue was purified by silica gel column chromatography (10-60percent ethyl acetate in hexanes) to yield ethyl 1-(2-(3,4-dimethoxyphenyl)-2-oxoethyl)-1H-pyrazole-5-carboxylate 5.01. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
91% | With potassium carbonate; In N,N-dimethyl-formamide; at 110℃; for 16h; | To a stirred solution of tert-butyl 4-carbamothioylpiperidine-1 -carboxylate (200 mg, 818.5 imol) in N,N-dimethylformamide (5 mL) was added 2-bromo-1-(3,4-dimethoxyphenyl)ethanone (212 mg, 818.50imol) and potassium carbonate (124 mg, 900 imol). The mixture was stirred at 110 Cfor 16 h. The reaction mixture was quenched with water (10 mL) and extracted with ethyl acetate (40 mL x 3). The combined organic phases were washed with saturated aqueous sodium chloride solution (10 mL), dried over anhydrous sodium sulfate, filtered, and concentrated to give tert-butyl 4-(4-(3,4- dimethoxyphenyl)thiazol-2-yl)piperidine-1 -carboxylate (300 mg, 742 imol, 91 %) as a yellow solid. Thiswas used directly without further purification. LCMS (ESI) m/z: [M÷H]÷ 405.3. |
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