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CAS No. : | 437-81-0 | MDL No. : | MFCD00010293 |
Formula : | C7H4F2O | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | SOWRUJSGHKNOKN-UHFFFAOYSA-N |
M.W : | 142.10 | Pubchem ID : | 136284 |
Synonyms : |
|
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H227-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 |
---|---|---|
78.8% | In toluene;Reflux; | General procedure: The appropriate (hetero) aromatic amine (1.0 mmol) and 2',6'-/3',5'-dihalo-substituted (hetero/aromatic) aldehyde (1.5 mmol) were stirred in dry toluene under reflux condition followed by addition of mercaptoaceticacid (2.0 mmol). The reaction mixture was refluxed with a Dean-Stark trap for 24-48 h until the complete consumption of (hetero) aromatic amine. The reaction mixture was concentrated to dryness under reduced pressure and the residue was taken up in ethyl acetate. The organic layer was successively washed with 5percent aq citric acid, water, 5percent aq sodium hydrogen carbonate, and then finally with brine. The organic layer was dried over sodium sulfate and solvent was removed under reduced pressure to get a crude product that was purified by column chromatography on silica-gel (230-400 mesh) using hexane-ethyl acetate as eluent. The structures of synthesized compounds were characterized by means of TLC, IR, ESI-MS, 1H NMR, 13C NMR, elemental analyses and HRMS. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
10%; 58% | General procedure: n-BuLi (1.67 M solution in hexane, 1.3 mL, 2.2 mmol) was added dropwise into a solution of p-bromoanisole (383 mg, 2.0 mmol) in THF (3 mL) at -78 C for 30 min. Then, DMF (0.22 mL, 2.2 mmol) was added to the mixture and the obtained mixture was stirred at rt. After 2 h at the same temperature, THF was removed. Then, MeOH (3 mL) was added to the residue and the mixture was stirred at room temperature. After 30 min, I2 (1523 mg, 6 mmol) and K2CO3 (829 mg, 6 mmol) were added at 0 C and the obtained mixture was stirred for 22 h at rt. The reaction mixture was quenched with satd aq Na2SO3 (5 mL) and was extracted with CHCl3 (3×20 mL). The organic layer was washed with brine and dried over Na2SO4 to provide methyl 4-methoxy-1-benzoate in 82% yield. If necessary, the product was purified by short column chromatography (SiO2:hexane:EtOAc=9:1) to give pure methyl 4-methoxybenzoate as a colorless oil. |
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