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0 °C

TBAF (9.50 g, 30 mmol) was added to a sol. of compound B1 (13.4 g, 30 mmol) in THF (100 mL) at 0° C. The mixture was stirred at 0° C. for 1 h. CH2Cl2 was added, and the mixture was washed with aq. sat. NH4Cl, water, and brine. The org. layer was dried over MgSO4, filtered, and the solvents were removed under reduced pressure. Drying the residue under high vacuum yielded the crude title compound (10.0 g, quantitative yield) that was used further without purification. LC-MS: tR=0.92 min; ES+: 334.23.

1. washthe mixture was washed with aq. sat. NH4Cl, water, and brine
2. dry with materiallayer was dried over MgSO4
3. filtrationfiltered
4. customthe solvents were removed under reduced pressure
5. customDrying the residue under high vacuum