反应详情

Ethyl 4-(p-chlorophenyl)pyrrole-3-carboxylate (1.6 g., 0.0064 mmol) is dissolved in tetrahydrofuran (40 mL). N-bromosuccinimide (1.14 g., 0.0064 mmol) is added in small portions at 25°-28° C. After the addition is complete, the solution is stirred overnight at room temperature. The solution is concentrated in vacuo and the solid residue partioned between water and ether. The ether layer is separated and dried over magnesium sulfate. Work-up of the ether extract leaves 1.9 g (90%) of a white solid which is purified by stirring with a mixture of 80/20 hexane/ethyl acetate. The insoluble solid (1.3 g, 62%) is collected and has m.p. 161°-164° C.

1. additionAfter the addition
2. concentrationThe solution is concentrated in vacuo
3. customThe ether layer is separated
4. dry with materialdried over magnesium sulfate
5. extractionextract