反应详情

(S)-methyl 4-(tert-butoxycarbonylamino)-5-hydroxypentanoate (24 g, 97.2 mmol) and isopropenyl methyl ether (88.8 g, 854.6 mmol) was dissolved in acetone (2000 mL) and BF3-Et2O (0.82 mL, 5.84 mmol) was added at rt. The mixture was stirred for 1 hr at rt. The reaction was quenched by addition of Et3N (11.6 mL). The reaction solution was washed with aqueous saturated NaHCO3 (200 mL) and evaporated, and (S)-tert-butyl 4-(3-methoxy-3-oxopropyl)-2,2-dimethyloxazolidine-3-carboxylate (25.1 g, 90%) was obtained as an oil, which was used in the next step without further purification.

1. customThe reaction was quenched by addition of Et3N (11.6 mL)
2. washThe reaction solution was washed with aqueous saturated NaHCO3 (200 mL)
3. customevaporated