反应详情

A 0° C. solution of 4-hydroxyindole (20 g, 150 mmol) in 500 ml of dimethylformamide is treated with NaH (60% dispersion in mineral oil; 6.6 g, 165 mmol). After 30 minutes, bromoacetonitrile (11.5 ml, 165 mmol) is added, and the resulting mixture is allowed to slowly warm to ambient temperature and stir for 3 days. The reaction mixture is diluted with ethyl acetate and washed 3 times with H2O. The organic layer is dried over Na2SO4 and concentrated in vacuo. The crude residue is purified by normal phase HPLC (SiO2; 5% step gradient of 0 to 20% ethyl acetate in hexanes) to give 25 g of (1H-indol-4-yloxy)acetonitrile (97%).

1. washwashed 3 times with H2O
2. dry with materialThe organic layer is dried over Na2SO4
3. concentrationconcentrated in vacuo
4. customThe crude residue is purified by normal phase HPLC (SiO2; 5% step gradient of 0 to 20% ethyl acetate in hexanes)