反应详情

A solution of 5.7 g (0.032 mole) of ethyl 1,4-dimethylpyrrole-2-acetate and 7.0 g (0.038 mole) of 2-nitrobenzoyl chloride in 130 ml xylene is heated at reflux under nitrogen for 18 hours. The mixture is stirred vigorously over a saturated sodium bicarbonate solution for 3 hours at room temperature. The xylene layer is separated from the aqueous layer, washed with brine, dried and filtered. The filtrate is concentrated in vacuo to give 9.9 g (95%) crude ethyl 1,3-dimethyl-2-(2-nitrobenzoyl)-pyrrole-5-acetate which can be used without further purification in the next step.

1. temperatureat reflux under nitrogen for 18 hours
2. customThe xylene layer is separated from the aqueous layer
3. washwashed with brine
4. customdried
5. filtrationfiltered
6. concentrationThe filtrate is concentrated in vacuo