反应详情

温度

-75 °C

A solution of Example 248B (0.7 g, 1.76 mmol) in tetrahydrofuran (50 mL) was cooled to −75° C. and treated dropwise with 2N lithium diisopropylamide in tetrahydrofuran (1.7 mL, 3.40 mmol). The mixture was stirred at −75° C. for 30 minutes and iodine (0.85 g, 3.52 mmol) in 2.5 mL tetrahydrofuran was added. The mixture was slowly brought to room temperature and quenched with aqueous ammonium chloride (100 mL) and extracted with ethyl acetate (twice). The organic layers were concentrated and purified by column chromatography (Combi Flash Rf) (silica gel, 30% ethyl acetate in hexane) to afford the title compound. MS (ESI+) m/z 524 (M+H)+.

1. customwas slowly brought to room temperature
2. customquenched with aqueous ammonium chloride (100 mL)
3. extractionextracted with ethyl acetate (twice)
4. concentrationThe organic layers were concentrated
5. custompurified by column chromatography (Combi Flash Rf) (silica gel, 30% ethyl acetate in hexane)