反应详情

温度

80 °C

To a solution of 2-(benzyloxycarbonylamino)-2-methyl-propanoic acid (which may be prepared as described in Description 32) (5000 mg, 21.08 mmol) in toluene (50 mL) was added ethanol (5 mL) and p-toluenesulfonic acid (400.89 mg, 2.11 mmol). The solution was stirred at 80° C. overnight. The reaction mixture was evaporated and the residues dissolved in EtOAc and washed with saturated aqueous sodium bicarbonate. The aqueous phase was back extracted into EtOAc. The combined organics were dried over magnesium sulphate, filtered and evaporated to yield the title compound (D33) as a light yellow oil (4.667 g);

1. customThe reaction mixture was evaporated
2. dissolutionthe residues dissolved in EtOAc
3. washwashed with saturated aqueous sodium bicarbonate
4. extractionThe aqueous phase was back extracted into EtOAc
5. dry with materialThe combined organics were dried over magnesium sulphate
6. filtrationfiltered
7. customevaporated