反应详情

A suspension of FMOC-Ser(O-Bzl) (4.16 g), paraformaldahyde (2.0 g), and p-toluenesulfonic acid (0.2 g) in toluene (400 ml) was heated under reflux with azeotropic water removal for 45 min. The solution was cooled, diluted with ethyl acetate (250 ml) and washed three times with 5% aqueous NaHCO3, dried (Na2SO4), and concentrated in vacuo. The residue was purified by silica gel column chromatography eluting with (8:2) hexane:ethyl acetate to give FMOC-Ser(O-Bzl)-oxazolidin-4-one as a crystalline product, m.p. 108°-109° C. Fab Mass spec. m/e 430(M+H)+.

1. temperaturewas heated
2. temperatureThe solution was cooled
3. washwashed three times with 5% aqueous NaHCO3
4. dry with materialdried (Na2SO4)
5. concentrationconcentrated in vacuo
6. customThe residue was purified by silica gel column chromatography
7. washeluting with (8:2) hexane