反应详情

To a solution of ethyl 2-(benzyloxycarbonylamino)-3,3,3-trifluoro-2-hydroxypropanoate (49.0 g, 153 mmol) in diethyl ether (350 mL) was added dropwise TFAA (35.3 g, 168 mmol) at 0° C. followed by addition of pyridine dropwise (26.5 g, 336 mmol) at 0° C. The reaction mixture was allowed to warm to ambient temperature and stirred for 6 h. The mixture was filtered and the filtrate was concentrated to afford ethyl 2-(benzyloxycarbonylimino)-3,3,3-trifluoropropanoate (45.0 g, 97% yield), which was used directly without further purification.

1. filtrationThe mixture was filtered
2. concentrationthe filtrate was concentrated