反応 #8191

反応方程式

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

triethylamine

2,4-bistrifluoromethylbenzeneboronic acid

→

{2-[7-(2,4-Bis-trifluoromethyl-phenyl)-1H-indol-3-yl]-1,1-dimethyl-ethyl}-carbamic acid tert-butyl ester

収率 89.2%

溶媒

dimethylformamide

brine

ethyl acetate

反応条件

後処理

1. 1
   温度cooled
2. 2
   洗浄The organics are washed seven times with brine
3. 3
   乾燥then dried over anhydrous sodium sulfate
4. 4
   ろ過filtered
5. 5
   その他evaporated in vacuo
6. 6
   その他The residue is purified
7. 7
   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 (262 mg, 0.600 mmol) in dimethylformamide (3.5 mL) is added triethylamine (0.11 mL, 0.780 mmol), tetrakis(triphenylphosphine)-palladium (28 mg, 0.0240 mmol) and 2,4-bistrifluoromethylbenzeneboronic acid (201 mg, 0.780 mmol). The mixture is heated to 100° C. for 20 hours, then cooled, diluted with brine and ethyl acetate. The organics are washed seven times with brine then dried over anhydrous sodium sulfate, filtered and evaporated in vacuo. The residue is purified using silica gel chromatography (hexane/20% ethyl acetate, hexane gradient elution) to give 268 mg of {2-[7-(2,4-Bis-trifluoromethyl-phenyl)-1H-indol-3-yl]-1,1-dimethyl-ethyl}-carbamic acid tert-butyl ester (89%). FDMS m/e=501 (M++1).

出典