反应详情

A suspension of anhydrous cerium(III) chloride (2.71 g, 11 mmol) in THF (10 mL) at −78° C. was slowly treated with 1.5M methyllithium complexed with lithium chloride in diethyl ether (6.7 mL), warmed to room temperature over 2 hours, and added to a solution of Example 420C (1.15 g, 5.0 mmol) in THF (10 mL) at −78° C. The reaction was gradually warmed to room temperature over 4 hours, diluted with ethyl acetate (100 mL), washed with water (45 mL) and brine (10 mL), dried (MgSO4), filtered, and concentrated. The concentrate was purified by flash column chromatography on silica gel with 10-30% ethyl acetate/hexanes to provide the desired product.

1. temperatureThe reaction was gradually warmed to room temperature over 4 hours
2. washwashed with water (45 mL) and brine (10 mL)
3. dry with materialdried (MgSO4)
4. filtrationfiltered
5. concentrationconcentrated
6. customThe concentrate was purified by flash column chromatography on silica gel with 10-30% ethyl acetate/hexanes