Aniline → 3-Bromo-N-phenyl-1-(phenylsulfonyl)-1H-pyrrole-2-carboxamide

Beteiligte Stoffe

Reaktionsschritte

In a three-necked round-bottom flask aniline (1.57 mL, 17.20 mmol) was dissolved in 80 mL of toluene under inert atmosphere. To this solution was added trimethy aluminium (7.82 mL, 15.64 mmol) and the mixture was stirred at room temperature during 10 minutes. Afterwards, a solution methyl 3-bromo-1-(phenylsulfonyl)-1H-pyrrole-2-carboxylate (2.0 g, 5.81 mmol) in 20 mL of toluene were added and the reaction mixtures was heated at 80° C. for 3 h. Next, the mixture was allowed to cool to room temperature and 20-30 mL of water was added to hydrolyze unreacted trimethyl aluminium and a 0,5M aqueous solution of disodium tartrate dihydrate was also added. After stirring for a while, the two layers were separated and the aqueous phase was extracted with ethyl acetate. The organic mixture was washed with the same 0,5M aqueous solution of disodium tartrate dehydrate (200 mL), water and brine, dried and concentrated in vacuum to afford 2.7 g of a residue that was used in the following step without further purification.

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