Acetic Anhydride → (R)-tert-butyl 2-(acetamidomethyl)morpholine-4-carboxylate

Reaktionsgleichung

[NH2:1][CH2:2][C@H:3]1[O:8][CH2:7][CH2:6][N:5]([C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])[CH2:4]1.C(N(CC)CC)C.[C:23](OC(=O)C)(=[O:25])[CH3:24]>ClCCl>[C:23]([NH:1][CH2:2][C@H:3]1[O:8][CH2:7][CH2:6][N:5]([C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])[CH2:4]1)(=[O:25])[CH3:24]

Komponenten

Versuchsvorschrift

To a solution of (R)-tert-butyl 2-(aminomethyl)morpholine-4-carboxylate (1.0 equiv.) and triethylamine (1.5 equiv.) in dichloromethane (0.1 M) was added acetic anhydride (1.1 equiv.). The resulting mixture was stirred at RT for 45 min. After concentration, the residue was partitioned between EtOAc and water. The organic phase was washed with water and then with brine. After drying over sodium sulfate the solution was concentrated in vaccuo to give crude (R)-tert-butyl 2-(acetamidomethyl)morpholine-4-carboxylate which was used in the next step without further purification. LCMS (m/z) (M+H)=159.1 (-Boc), Rt=0.53 min.