反应详情

To a stirring solution of phosphorus pentoxide (0.30 g, 1.10 mmol) in DCM (8 ml) at 0° C. was added a solution of 5-{4-[2-hydroxy-2-(2-methoxyphenyl)ethoxy]benzyl}-1,3-thiazolidine-2,4-dione (0.20 g, 0.54 mmol) in DCM (8 ml) followed by dimethyl sulfoxide (0.20 mL, 2.80 mmol). After stirring for 15 minutes, N,N-diisopropylethylamine (0.28 mL, 1.60 mmol) was added. After 45 minutes, the reaction mixture was cast into cold saturated NaHCO3 and extracted with EtOAc (×2). The combined extracts were washed with brine, dried (Na2SO4), filtered and evaporated in vacuo. The residue was chromatographed on a small silica gel column eluting with 0-10% EtOAc/DCM. Fractions containing product were combined and evaporated in vacuo to give 175 mg (88%) of the title compound as a light yellow solid. MS (ESI−) for C19H17NO5S m/z 370.1 (M−H)−.

1. waitAfter 45 minutes
2. extractionextracted with EtOAc (×2)
3. washThe combined extracts were washed with brine
4. dry with materialdried (Na2SO4)
5. filtrationfiltered
6. customevaporated in vacuo
7. customThe residue was chromatographed on a small silica gel column
8. washeluting with 0-10% EtOAc/DCM
9. additionFractions containing product
10. customevaporated in vacuo