反应详情

The starting material is prepared as follows: The solution of 1,325 g of 1-methylpyrrole-2-carboxylic acid in 2,400 ml of dimethylformamide is added to the suspension prepared from 568.5 g of 50% sodium hydride in mineral oil and 2,400 ml of dimethylformamide, while stirring under nitrogen and cooling with ice. Thereupon 1,000 ml of dimethylformamide are added, followed by 4,316 g of methyl iodide while stirring and keeping the temperature below 88°. Stirring is continued overnight at room temperature, whereupon the mixture is cooled to 10° and combined with 10,600 ml of water. It is extracted thrice with 5,300 ml of diethyl ether, the extract washed with 5,300 ml of 10% aqueous sodium carbonate and 5,300 ml of water, dried and evaporated, to yield the 1-methylpyrrole-2-carboxylic acid methyl ester as an oil.

1. customThe starting material is prepared
2. temperaturecooling with ice
3. stirringwhile stirring
4. customthe temperature below 88°
5. stirringStirring
6. temperatureis cooled to 10°
7. extractionIt is extracted thrice with 5,300 ml of diethyl ether
8. washthe extract washed with 5,300 ml of 10% aqueous sodium carbonate and 5,300 ml of water
9. customdried
10. customevaporated