Dimethylformamide → 4-Methanesulfonyloxy-1-(4-nitrobenzyloxycarbonyl)pyrrolidine

To a mixture of dimethylformamide (0.45 ml) and tetrahydrofuran (10 ml) was dropwise added phosphorus oxychloride (0.46 ml) at -5°∫5° C., and the mixture was stirred at the same temperature for 30 minutes. To the mixture was added a solution of (2S,4R)-2-(4-carboxythiazol-2-yl) -4-methanesulfonyloxy-1-(4-nitrobenzyloxycarbonyl) pyrrolidine (1.54 g) in tetrahydrofuran (20 ml) at -5°∫5° C., followed by stirring at the same temperature for 30 minutes. The mixture was dropwise added to concentrated ammonia water (15 ml) at 0°-10° C. with stirring. The mixture was stirred at the same condition for 2 hours. Tetrahydrofuran was removed under reduced pressure to give a residue, which was extracted with ethyl acetate. The organic layer was dried over magnesium sulfate and concentrated under reduced pressure to give (2S, 4R)-2-(4-carbamoylthiazol)-2-yl) -4-methanesulfonyloxy-1-(4-nitrobenzyloxycarbonyl)pyrrolidine (1.4 g).

1. customat -5°
2. custom∫5° C.
3. stirringby stirring at the same temperature for 30 minutes
4. stirringwith stirring
5. stirringThe mixture was stirred at the same condition for 2 hours
6. customTetrahydrofuran was removed under reduced pressure
7. customto give a residue, which
8. extractionwas extracted with ethyl acetate
9. dry with materialThe organic layer was dried over magnesium sulfate
10. concentrationconcentrated under reduced pressure

ORD 기록

ord-e47ef4e0559c40acb2ec7e2e9b0dc4e6

출처 데이터셋

uspto-grants-1995_05

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US05420122