反应详情

A mixture of Example 176A (200 mg, 0.56 mmol), p-toluenesulfonic acid (10 mg), acetone (10 mL), and water (1 mL) at ambient temperature was stirred for 16 hours. The mixture was concentrated and washed with sodium bicarbonate (12 mL). The aqueous layer was extracted with dichloromethane/methanol (9:1). The combined organic extracts were concentrated to provide the desired product (160 mg, 0.92 mmol). Reverse phase HPLC (5% to 95% acetonitrile over 25 minutes, 1 mL/min, 254 nm, hypersil HS 100 Å, C18, 5 μm, 250×4.6 column) Rt=15.5 min.

1. concentrationThe mixture was concentrated
2. washwashed with sodium bicarbonate (12 mL)
3. extractionThe aqueous layer was extracted with dichloromethane/methanol (9:1)
4. concentrationThe combined organic extracts were concentrated