反应详情

Borane-dimethyl sulfide complex (1.57 mL, 3.14 mmol) was added dropwise at 0° C. to a solution of (R)-3-tert-butoxycarbonylamino-N,N-dimethyl-succinamic acid benzyl ester (500 mg, 1.43 mmol). The reaction mixture was warmed to room temperature and heated at reflux for 3 hours, then cooled to 0° C. and treated dropwise with 6 M aq. hydrochloric acid solution (0.68 mL, 4.1 mmol). The reaction mixture was allowed to warm to room temperature and concentrated in vacuo. Residual water was azeotroped with toluene and concentrated under high vacuum to afford (R)-3-amino-4-dimethylamino-butyric acid benzyl ester dihydrochloride (384 mg, 87%). White solid, m/e=237.4 ([M+H]+).

1. temperatureheated
2. temperatureat reflux for 3 hours
3. temperaturecooled to 0° C.
4. temperatureto warm to room temperature
5. concentrationconcentrated in vacuo
6. customResidual water was azeotroped with toluene
7. concentrationconcentrated under high vacuum