Reacción #1509623

Ecuación de reacción

2-Trichloroacetyl pyrrole

bromine

water

→

title compound 7

Rendimiento 93.8%

1-(4-bromo-1H-pyrrol-2-yl)-2,2,2-trichloro-ethanone

Rendimiento 93.8%

Disolventes

chloroform

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.ADDITIONOnce addition
2. 2
   Extracciónextracted with chloroform (3×20 mL) The combined organic layers
3. 3
   Lavadowere washed with sat. NaHCO3 (2×30 mL), brine (1×20 mL)
4. 4
   Secadodried over anhydrous sodium sulfate
5. 5
   Filtraciónfiltered
6. 6
   Otroevaporated to dryness
7. 7
   OtroPurification of the residue by column chromatography (Hexanes/Diethyl Ether 95:5)

Procedimiento

2-Trichloroacetyl pyrrole 6 (5.00 g, 23.3 mmol) was dissolved in anhydrous chloroform (20 mL) The solution was cooled to −10° C. before the drop-wise addition of bromine (1.20 mL, 23.3 mmol) to the flask. Once addition was complete the reaction was allowed to warm to room temperature on its own accord while stirring for an additional 30 minutes. The reaction was poured into water (40 mL) and extracted with chloroform (3×20 mL) The combined organic layers were washed with sat. NaHCO3 (2×30 mL), brine (1×20 mL), dried over anhydrous sodium sulfate, filtered, and evaporated to dryness. Purification of the residue by column chromatography (Hexanes/Diethyl Ether 95:5) yielded the title compound 7 (6.37 g, 93%) as an off-white solid: 1H NMR (300 MHz, DMSO-d6) δ 12.86 (s, 1H), 7.54 (s, 1H), 7.32 (s, 1H); 13C NMR (100 MHz, DMSO-d6) δ 171.67, 129.06, 122.01, 121.54, 97.60, 94.56; HRMS (FAB) calcd for C6H3BrCl3NO (M+) 288.8464, found 288.8479.

Fuente