反应详情

温度

-78 °C

To a two-necked flask was added chopped pieces of magnesium turnings (24 mg, 1.0 mmol). The flask was flame-dried under vacuum and cooled under argon. Bis(cyclopentadienyl)titanium dichloride (250 mg, 1.0 mmol) was added followed by anhydrous THF (5 mL). The stirring suspension was evacuated with low vacuum, and the reaction flask was refilled with argon. The red suspension became dark, turning a homogeneous deep green after 1.5 h with nearly all the magnesium metal being consumed. An aliquot (3.5 mL, 0.70 mmol, 3.5 eq) was removed and cooled to −78° C. under argon. To this solution was added epothilone A (99 mg, 0.20 mmol, 1.0 eq). The reaction mixture was warmed to room temperature and stirred for 15 min. The volatiles were removed in vacuo and the residue was chromatographed two times on silica (25 g), eluting with 35% EtOAc/hexanes to give 76 mg (80%) of epothilone C as a pale yellow viscous oil.

1. additionTo a two-necked flask was added
2. customThe flask was flame-dried under vacuum
3. temperaturecooled under argon
4. customThe stirring suspension was evacuated with low vacuum
5. additionthe reaction flask was refilled with argon
6. customhomogeneous deep green after 1.5 h
7. custombeing consumed
8. customAn aliquot (3.5 mL, 0.70 mmol, 3.5 eq) was removed
9. temperatureThe reaction mixture was warmed to room temperature
10. customThe volatiles were removed in vacuo
11. customthe residue was chromatographed two times on silica (25 g)
12. washeluting with 35% EtOAc/hexanes