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0 °C

(2S)-1-(Benzyloxy)-3-{[tert-butyl(dimethyl)silyl]oxy}-N-tritylpropan-2-amine (3.02 g, 5.62 mmol) was dissolved in 60 mL of anhydrous CH2Cl2 and 9.1 mL of glacial acetic acid. The reaction mixture was cooled to 0° C. under an atmosphere of N2 and boron trifluoride diethyl etherate (0.75 mL, 5.92 mmol) was added dropwise over several minutes. After stirring for 5 hours, the reaction mixture was treated with 85 mL of cold, aqueous 10% NaOH solution. The layers were separated and the aqueous portion was extracted with CH2Cl2 (2×20 mL). The organic layers were combined and dried over Na2SO4, filtered and concentrated under reduced pressure. Chromatography (SiO2, 0-5% methanol/CHCl3) gave 1.57 g of (2S)-1-(benzyloxy)-3-{[tert-butyl(dimethyl)silyl]oxy}propan-2-amine as a white solid.

1. customThe layers were separated
2. extractionthe aqueous portion was extracted with CH2Cl2 (2×20 mL)
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure