反应详情

温度

0 °C

2,4-Thiazolidinedione (2.83 g, 24.2 mmol) was dissolved in dry THF (170 mL) and cooled to 0° C. under argon. Butyllithium (1.6 M in hexanes, 30 mL, 48.0 mmol) was added dropwise. Stirring continued for 0.5 h at 0° C. Under argon, 13 (5.7 g, 11.8 mmol) was dissolved in dry THF (30 mL) and was added rapidly via syringe to the above suspension with rapid stirring. The temperature was maintained at 0° C. for 45 min before quenching with aqueous HCl (5%, 40 mL). Additional H2O (40 mL) was added and extracted with ethyl acetate (3×30 mL). Organic layers were combined, washed with brine, dried over anhydrous magnesium sulfate, filtered and the solvent was evaporated. Flash chromatography over silica gel using hexanes-ethyl acetate (3:2) as eluting solvent yielded the title compound, 11, (0.93 g, 15%). The melting point and 1H NMR of compound 11 made by this method were identical to those for compound 11 produced by the synthetic route starting from compound 10 described above.

1. additionwas added rapidly via syringe to the above suspension with rapid stirring
2. temperatureThe temperature was maintained at 0° C. for 45 min
3. custombefore quenching with aqueous HCl (5%, 40 mL)
4. additionAdditional H2O (40 mL) was added
5. extractionextracted with ethyl acetate (3×30 mL)
6. washwashed with brine
7. dry with materialdried over anhydrous magnesium sulfate
8. filtrationfiltered
9. customthe solvent was evaporated
10. washas eluting solvent