反应详情

A solution of morpholine-3-carboxylic acid (4.035 g; 30.8 mmol) in ethanol (250 ml) was saturated with gaseous HCl, then stirred for a week. The solvent was evaporated and the residue taken up in water and made basic (pH˜10) with sodium hydrogen carbonate and sodium carbonate. The mixture was then extracted with dichloromethane (7×), the combined extracts dried (Na2SO4) and the solvent evaporated to give ethyl morpholine-3-carboxylate (746 mg). EIMS: m/z=160.4 [M+H]+. This ester derivative and lithium aluminium hydride (1 M in THF, 9.4 ml, 9.4 mmol) were carefully combined under a nitrogen atmosphere and following addition were heated to reflux. After 5 h the reaction was cooled to room temperature and carefully quenched using dropwise water addition with ice cooling, then filtered and washed with dichloromethane. The solvent was evaporated to give 3-(hydroxymethyl)morpholine (409 mg). EIMS: m/z=118.2 (M+H)+.

1. customThe solvent was evaporated
2. extractionThe mixture was then extracted with dichloromethane (7×)
3. dry with materialthe combined extracts dried (Na2SO4)
4. customthe solvent evaporated