反应详情

温度

10 °C

Following a general procedure previously described (P. Doster et al. Eur. I. Med. Chem. 1984, 19, 105), 8.2 g (62 mmol) 2,5-dimethoxytetrahydrofuran were heated at 80° C. in 75 ml of 0.1N aqueous HCl for 1 h. After cooling to 10° C., 10 g (68.4 mmol) acetone dicarboxylic acid, 12.4 g (68.5 mmol) 2-(3,4-dimethoxyphenyl)ethylamine, 6.13 g (74.7 mmol) sodium acetate and 5.7 ml 12N aqueous HCl were added wile stirring. Stirring was maintained overnight at room temperature. The aqueous mixture was neutralized and extracted with methylene chloride. The organic phase was washed with brine, dried over MgSO4 and concentrated. The filtrate was concentrated and the residual oil was purified by chromatography on silica gel using ethyl acetate as eluent, affording 12 g of an oil pure by TLC.

1. stirringStirring
2. temperaturewas maintained overnight at room temperature
3. extractionextracted with methylene chloride
4. washThe organic phase was washed with brine
5. dry with materialdried over MgSO4
6. concentrationconcentrated
7. concentrationThe filtrate was concentrated
8. customthe residual oil was purified by chromatography on silica gel