Acetic Anhydride → (R)-Benzyl (2,5-dioxotetrahydrofuran-3-yl)carbamate
Reaktionsgleichung
[CH2:1]([O:8][C:9]([NH:11][C@H:12]([CH2:16][C:17]([OH:19])=[O:18])[C:13]([OH:15])=O)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(OC(=O)C)(=O)C>>[O:15]=[C:13]1[C@H:12]([NH:11][C:9](=[O:10])[O:8][CH2:1][C:2]2[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=2)[CH2:16][C:17](=[O:18])[O:19]1Komponenten
3
Versuchsvorschrift
A mixture of (R)-2-(benzyloxycarbonylamino)succinic acid (Aldrich, 30 g, 112.26 mmol) and acetic anhydride (65.7 ml, 696.02 mmol) was stirred overnight at room temperature during which time the reaction mixture became clear. The volatiles were removed under reduced pressure (water bath temperature 65° C.) and the concentrate was azeotroped with toluene (3×50 ml) and obtained the title product after drying for ˜48 hours at 60° C. under high vacuum pump (28.0 g, yield: almost quantitative).
Aufarbeitung
- customThe volatiles were removed under reduced pressure (water bath temperature 65° C.)
- customthe concentrate was azeotroped with toluene (3×50 ml)