Réaction #716366

Équation de réaction

Bromine

1-methyl-1H-pyrrole-2-carbaldehyde

iodine

→

4-bromo-1-methyl-1H-pyrrole-2-carbaldehyde

Rendement 95.7%

Solvants

chloroform

chloroform

Conditions de réaction

Traitement

1. 1
   workup.STIRRINGThe solution was stirred
2. 2
   AutreChloroform was removed in vacuo
3. 3
   workup.ADDITIONthe residue added to 5% sodium bisulfite solution
4. 4
   Autreto quench excess bromine/iodine
5. 5
   workup.ADDITIONSaturated sodium bicarbonate was added until the pH of the mixture
6. 6
   ExtractionOrganics were extracted with ether (3×75 mL)
7. 7
   Séchagedried over magnesium sulfate
8. 8
   Filtrationfiltered
9. 9
   Concentrationconcentrated

Mode opératoire

To a solution of 1-methyl-1H-pyrrole-2-carbaldehyde (1.09 g, 10.0 mmol) in 60 mL chloroform at −20° C. was added a single crystal of iodine. The mixture was stirred until homogeneous. Bromine (0.51 mL, 10.0 mmol) was added dropwise as a solution in 10 mL chloroform. The solution was stirred while warming from −20 to 0° C. over 1.5 h. Chloroform was removed in vacuo and the residue added to 5% sodium bisulfite solution to quench excess bromine/iodine. Saturated sodium bicarbonate was added until the pH of the mixture reached 7. Organics were extracted with ether (3×75 mL), dried over magnesium sulfate, filtered and concentrated to give crude 4-bromo-1-methyl-1H-pyrrole-2-carbaldehyde (1.80 g) as the major component of a mixture of starting aldehyde and dibromopyrrole. Used without further purification.

Source