反应详情

To a solution of 0.560 g (1.62 mmol) of the product of Step B dissolved in 5 mL of carbon tetrachloride was added 0.154 mL (1.6 mmol) of phosphorous tribromide and the reaction mixture was stirred at room temperature for 15 minutes. Carbon tetrachloride was evaporated from the reaction mixture several times to remove the hydrogen bromide, then the residue was purified on a silica gel flash chromatography column eluted with 5% EtOAc-hexane. The purified fractions were evaporated in vacuo affording 0.523 g (81%) of the title compound.

1. customCarbon tetrachloride was evaporated from the reaction mixture several times
2. customto remove the hydrogen bromide
3. customthe residue was purified on a silica gel flash chromatography column
4. washeluted with 5% EtOAc-hexane
5. customThe purified fractions were evaporated in vacuo