反应详情

Prepared according to WO patent: 2013004290. To a solution of (R)-3,3,6,6-tetramethyltetrahydropyrrolo[1,2-c]oxazol-5(3H)-one (4.13 g, 22.54 mmol) in MeOH (90 mL) was added p-toluenesulfonic acid monohydrate (0.429 g, 2.254 mmol). The resulting mixture was heated at reflux for 2 h. The solvent was removed under reduced pressure (rotary evaporator) and the crude material was absorbed onto a plug of silica gel and purified by chromatography on an ISCO Combiflash™ RF (40 g Grace Reverlis column, using a gradient of 0-20% MeOH in DCM) affording (R)-5-(hydroxymethyl)-3,3-dimethylpyrrolidin-2-one (2.91 g, 20.31 mmol, 90% yield) as a white semi-solid. MS (ESI) 144.1 [M+H]+.

1. customPrepared
2. temperatureThe resulting mixture was heated
3. temperatureat reflux for 2 h
4. customThe solvent was removed under reduced pressure (rotary evaporator)
5. customthe crude material was absorbed onto a plug of silica gel
6. custompurified by chromatography on an ISCO Combiflash™ RF (40 g Grace Reverlis column