反应详情

3-(3,4-Dimethoxy-phenyl)-1H-pyrrolo[2,3-b]pyridine 1(250 mg, 0.98 mmole) was dissolved in 50 mL of CH2Cl2. N,N-diethylisopropylamine (205 uL, 1.2 mmol), 2-ethoxy-4-nitro-benzoic acid (228 mg, 1.1 mmol) and bromotris(pyrolodino)phoshonium hexafluorophosphate (550 mg, 1.1 mmol) were added to the stirring reaction mixture. The mixture was stirred at ambient temperature for 4 h and washed consecutively with saturated sodium bicarbonate and saturated potassium bisulfate solution. The resulting solution was dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The residue was purified by silica gel chromatography (30% ethyl acetate in hexanes) to yield 340 mg (77%) of the titled compound as a yellow solid. MS(ESI) [M+H+]+=448.2.

1. washwashed consecutively with saturated sodium bicarbonate and saturated potassium bisulfate solution
2. dry with materialThe resulting solution was dried over anhydrous magnesium sulfate
3. filtrationfiltered
4. concentrationconcentrated under reduced pressure
5. customThe residue was purified by silica gel chromatography (30% ethyl acetate in hexanes)