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CAS No. : | 72517-23-8 | MDL No. : | MFCD01321078 |
Formula : | C9H9BrO4 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | ZKMWQUDSDYOEJQ-UHFFFAOYSA-N |
M.W : | 261.07 | Pubchem ID : | 322872 |
Synonyms : |
|
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P280-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H302-H315-H319-H332-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 oxalyl dichloride; N,N-dimethyl-formamide; In dichloromethane; at 20℃; for 1.5h;Reflux; | General procedure: Oxalyl chloride (0.24 mL, 2.7 mmol) was added in a dropwise manner to a solution of the carboxylic acid 7 (0.30 g, 1.81 mmol) in dry CH2Cl2 (10 mL) added with dry DMF (0.2 mL). The mixture was stirred at room temperature for 1 h and then it was refluxed for 30 min. The solvent was removed under reduced pressure, and the crude residue was dissolved in dry CH2Cl2 and added to a solution of the appropriate amine (2.7 mmol) and triethylamine (3.6 mmol) in CH2Cl2 (10 mL), at 0 C. The resulting mixture was heated under stirring to reflux for 1 h. Then, the solution was cooled and extracted with 3 N HCl. The aqueous layer was made basic with a solution of NaOH and extracted with CH2Cl2 (3 × 10 mL). The combined organic extracts were dried over Na2SO4 and concentrated under reduced pressure to give a crude mixture which was purified by column chromatography to achieve the final product. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
87.5% | Dissolve 0.486 g (1.86 mmol) of 5-bromo-2,3-dimethoxybenzoic acid in 10 ml of dry toluene, add 0.39 ml of thionyl chloride, and heat for 1 hour under the protection of argon at 60 ° C., evaporate dry,After addition of 10ml of anhydrous DCM, 0.286g of (S) -2-aminomethyl-1-ethylpyrrole was added dropwise to the ice-water bath. After the reaction was stirred at room temperature for 8 hours, it was diluted with 50ml of DCM, washed with saturated aqueous NaHCO3 Washed three times,The organic layer was dried over Na2SO4, filtered and evaporated to give a yellowish oil which was separated on a medium pressure silica gel column with mobile phase petroleum ether: ethyl acetate 2: 1. The product fractions were collected and evaporated to give 1.628 g of a slightly yellow oil 87.5percent. |
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