反应详情

5-(4-Fluoro-phenyl)-5-oxo-pentanoic acid (1 g, 5.10 mmol) and (S)-(+)-2-phenylglycinol (0.839 g, 6.12 mmol) in toluene (15 mL) together with 4 Å molecular sieves was heated at 140° C. under Dean-Stark conditions for 20 hours. The reaction mixture was filtered through Celite®, evaporated and the residue dissolved in ethyl acetate then re-evaporated. The crude material was purified by column chromatography eluting with 20-40% ethyl acetate in cyclohexane to afford (3S,8aS)-8a-(4-fluoro-phenyl)-3-phenyl-hexahydro-oxazolo[3,2-a]pyridin-5-one (1.08 g).

1. filtrationThe reaction mixture was filtered through Celite®
2. customevaporated
3. dissolutionthe residue dissolved in ethyl acetate
4. customthen re-evaporated
5. customThe crude material was purified by column chromatography
6. washeluting with 20-40% ethyl acetate in cyclohexane