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Under N2, 23 (10.4 mmol) was dissolved in CH2Cl2 and, at −40° C., BBr3 (31.4 mmol) was slowly added. The mixture was then stirred 24 hours at room temperature. The reaction mixture was quenched with water and extracted with ethyl acetate (×3 100 ml). The organic layers were combined, dried over Na2SO4 and the solvent was removed via a rotary evaporator. The residue was purified by chromatography on silica gel using 7:3 hexane/ethyl acetate as the eluent to yield 1.53 g (53%) of 24 as a yellow solid.

1. customThe reaction mixture was quenched with water
2. extractionextracted with ethyl acetate (×3 100 ml)
3. dry with materialdried over Na2SO4
4. customthe solvent was removed via a rotary evaporator
5. customThe residue was purified by chromatography on silica gel using 7:3 hexane/ethyl acetate as the eluent