反応 #1159772

反応方程式

trifluoro-methanesulfonic acid 3-(2-tert-butoxycarbonylamino-2-methyl-propyl)-1H-indol-7-yl ester

triethylamine

2-thiopheneboronic acid

→

[1,1-Dimethyl-2-(7-thiophen-2-yl-1H-indol-3-yl)-ethyl]-carbamic acid tert-butyl ester

収率 31.3%

溶媒

dimethylformamide

brine

ethyl acetate

反応条件

後処理

1. 1
   温度The mixture is refluxed for 22 hours
2. 2
   温度cooled
3. 3
   洗浄The organic phase is washed 7 times with brine
4. 4
   乾燥The organics are dried over anhydrous sodium sulfate
5. 5
   ろ過filtered
6. 6
   その他evaporated in vacuo
7. 7
   その他The residue is purified
8. 8
   洗浄silica gel chromatography (hexane/20% ethyl acetate, hexane gradient elution)

実験手順

To a solution of trifluoro-methanesulfonic acid 3-(2-tert-butoxycarbonylamino-2-methyl-propyl)-1H-indol-7-yl ester (437 mg, 1.00 mmol) in dimethylformamide (6 mL) is added triethylamine (0.18 mL, 1.30 mmol), tetrakis(triphenylphosphine)-palladium (46 mg, 0.0401 mmol) and 2-thiopheneboronic acid (167 mg, 1.30 mmol). The mixture is refluxed for 22 hours, then cooled and diluted with brine and ethyl acetate. The organic phase is washed 7 times with brine. The organics are dried over anhydrous sodium sulfate, filtered and then evaporated in vacuo. The residue is purified using silica gel chromatography (hexane/20% ethyl acetate, hexane gradient elution) to give 116 mg of [1,1-Dimethyl-2-(7-thiophen-2-yl-1H-indol-3-yl)-ethyl]-carbamic acid tert-butyl ester (31%). FDMS m/e=371 (M++1).

出典