反应详情

A mixture of 2-(2,4-dichlorophenyl)benzoxazol-5-ol, a compound of formula (g) (6.0 g, 36 mmol), (S)-(+)-epichlorohydrin (3.3 g, 315 mmol), a compound of formula (b) (20 ml, 182 mmol), and potassium carbonate (20 g, 144 mmol) in acetone (100 ml) was heated to reflux and stirred overnight. The solution was allowed to cool and filtered through Celite 512. The filtrate was evaporated under reduced pressure, to yield an oil. The oil was chromatographed on silica gel, eluting with 20% ethyl acetate/hexanes, to provide 2-(2,4-dichlorophenyl)-5-(oxiran-2-ylmethoxy)benzoxazole as a white solid (6.2 g, 28 mmol).

1. temperatureto reflux
2. temperatureto cool
3. filtrationfiltered through Celite 512
4. customThe filtrate was evaporated under reduced pressure
5. customto yield an oil
6. customThe oil was chromatographed on silica gel
7. washeluting with 20% ethyl acetate/hexanes