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CAS No. : | 238749-50-3 | MDL No. : | MFCD15730638 |
Formula : | C9H8BrNO2S | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | KXGSKTSSCQBDOA-UHFFFAOYSA-N |
M.W : | 274.13 | Pubchem ID : | 13164349 |
Synonyms : |
|
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 |
---|---|---|
12.1 g | With sodium ethanolate In ethanol; o-xylene at 0℃; for 3.5 h; Inert atmosphere; Reflux | Under an argon stream, 5-bromo-2-thiophenecarboxaldehyde (19.1 g, 0.1 mol) and ethyl azidoacetate (51.6 g, 0.4 mol) were dissolved in ethanol (800 mL) in a 2 L four-neck flask, and a 20percent by mass sodium ethoxide ethanol solution (136 g, 0.4 mol) was slowly added dropwise to the obtained solution at 0° C. in an ice bath, followed by stirring for 2 hours. After the reaction ended, a saturated ammonium chloride aqueous solution was added thereto to adjust the pH to be weakly acidic. Furthermore, water was added thereto, and the precipitate was collected by filtration, and dried, whereby ethyl 2-azido-3-(5-bromo-thiophen-2-yl)-acrylate was obtained as a yellow solid (obtained amount: 18.4 g, yield: 61.3percent). Next, ethyl 2-azido-3-(5-bromo-thiophen-2-yl)-acrylate (18.1 g, 60 mmol) was put into a 500 mL egg-plant shaped flask, and dissolved in o-xylene (200 mL), followed by refluxing and stirring for 1.5 hours. After the solution after refluxing and stirring was concentration under reduced pressure, the obtained crude product was recrystallized (solution: hexane and ethyl acetate), then, the resultant product was subjected to suction filtration, and the obtained filtered material was dried, whereby ethyl 2-bromo-4H-thieno [3.2-b]pyrrole-5-carboxylate (d-1) was obtained (obtained amount: 12.1 g, yield: 73.8percent). |
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