反応 #1509623

反応方程式

2-Trichloroacetyl pyrrole

bromine

water

→

title compound 7

収率 93.8%

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

収率 93.8%

溶媒

chloroform

反応条件

後処理

1. 1
   workup.ADDITIONOnce addition
2. 2
   抽出extracted with chloroform (3×20 mL) The combined organic layers
3. 3
   洗浄were washed with sat. NaHCO3 (2×30 mL), brine (1×20 mL)
4. 4
   乾燥dried over anhydrous sodium sulfate
5. 5
   ろ過filtered
6. 6
   その他evaporated to dryness
7. 7
   その他Purification of the residue by column chromatography (Hexanes/Diethyl Ether 95:5)

実験手順

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.

出典