反应详情

To a cold solution of crude compound (10a) (155 g) prepared in EXAMPLE 16 in THF (450 mL) was added a solution of L-Selectride in THF (1.06 M, 230 mL). 30% H2O2 (40 mL) was then added at −30° C., stirred for 1 h. Saturated aqueous NaCl (150 mL) was added into the reaction mixture, the layers were separated, the aqueous layer was extracted twice with MTBE or toluene (PhMe) (300 mL each) and then the combined organic layer was concentrated under reduced pressure. The crude product was purified by column chromatography to furnish 51.3 g of compound (11a) (92% HPLC purity, 50% yield). This was used directly in EXAMPLE 18.

1. customthe layers were separated
2. extractionthe aqueous layer was extracted twice with MTBE or toluene (PhMe) (300 mL each)
3. concentrationthe combined organic layer was concentrated under reduced pressure
4. customThe crude product was purified by column chromatography