反应详情

780 mg (25.9 mmol) of sodium hydride (80% in oil) and 20 ml of DMF were introduced into a three-necked flask, a solution of 6.5 g (25.9 mmol) of methyl 4-iodo-2-pyrrolecarboxylate in 50 ml of DMF was added dropwise and stirring was carried out until gas evolution has ceased. 2.1 ml (33.6 mmol) of iodomethane were then added and stirring was carried out at room temperature for two hours. The reaction mixture was poured into water and extracted with ethyl ether. The organic phase was separated by settling, dried over magnesium sulfate and was evaporated. The residue obtained was purified by chromatography on a silica column eluted with a mixture of dichloromethane and hexane (40/60). 4.5 g (65%) of methyl N-methyl-4-iodo-2-pyrrolecarboxylate, with a melting point of 64°-65° C., were recovered.

1. stirringstirring
2. extractionextracted with ethyl ether
3. customThe organic phase was separated
4. dry with materialdried over magnesium sulfate
5. customwas evaporated
6. customThe residue obtained
7. customwas purified by chromatography on a silica column
8. washeluted with a mixture of dichloromethane and hexane (40/60)
9. custom4.5 g (65%) of methyl N-methyl-4-iodo-2-pyrrolecarboxylate, with a melting point of 64°-65° C., were recovered