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Jones reagent was added in portions to a mixture of alcohol 46 (3.23 g, 10.1 mmol) in acetone (50 mL) at 0° C. until the alcohol was consumed. The mixture was partitioned between 0.1M HCl (100 mL) and ethyl acetate (400 mL), and the organic phases were washed with brine (100 mL), dried, and concentrated in vacuo. The product was purified by flash chromatography to give compound 47 as an oil (Rf 0.38, silica, 25% ethyl acetate in hexane, 2.09 g, 62%).

1. customwas consumed
2. customThe mixture was partitioned between 0.1M HCl (100 mL) and ethyl acetate (400 mL)
3. washthe organic phases were washed with brine (100 mL)
4. customdried
5. concentrationconcentrated in vacuo
6. customThe product was purified by flash chromatography