反应详情

To 3 g of the 3-(3,4-dimethoxyphenethyl)amino-2-hydroxypropionic acid prepared in Example I was added 200 ml of benzene and 20 ml of 2-methoxybenzyl alcohol. About 0.5 ml of concentrated HCl was added to catalyze the reaction. The reaction mixture was heated to reflux for 6 hours and the water was collected by a moisture trap. The reaction mixture was extracted with 200 ml of 0.5% HCl in water. The aqueous layer was basified with NaHCO3 and extracted with CHCl3. Evaporation of the CHCl3 gave an oily residue which after chromotography on a column (silica gel/Et2O:EtOH=5:1) gave 1 g (23%) of white solid: m.p. 79.5°-82.5° C. The NMR, IR and mass spectra were consistent with the assigned structure and the elemental analysis was consistent with the empirical formula C21H27O6N.

1. customthe reaction
2. temperatureThe reaction mixture was heated
3. temperatureto reflux for 6 hours
4. customthe water was collected by a moisture trap
5. extractionThe reaction mixture was extracted with 200 ml of 0.5% HCl in water
6. extractionextracted with CHCl3
7. customEvaporation of the CHCl3
8. customgave an oily residue which after chromotography on a column (silica gel/Et2O:EtOH=5:1)