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0 °C

3-[[(1,1-Dimethylethyl)dimethylsilyl]oxy]-azetidine (300 mg, 1.6 mmol) was combined with dichloromethane (16 mL) to give a brown solution. N,N-Diisopropylethylamine (455 mg, 615 μl, 3.52 mmol) was added at 0° C. Subsequently 3-(4-cyanophenyl)-2-oxaziridinecarboxylic acid 1,1-dimethylethyl ester (355 mg, 1.44 mmol) in dichloromethane (10 mL) was added during 25 min at 0° C. and the reaction mixture was stirred for 1 h at 0° C. Afterwards the reaction mixture was concentrated in vacuo and the residue was purified by flash chromatography (silica gel, 20 g, 0% to 40% ethyl acetate in n-heptane) to deliver an oil contaminated with 4-cyano-benzaldehyde. This material was purified by a second chromatography (aminophase 12 g, ethyl acetate/n-heptane 1/1) to give the title compound (320 mg, 67%) as white waxy solid; GC-MS (EI) 302.0 (M)+.

1. customto give a brown solution
2. concentrationAfterwards the reaction mixture was concentrated in vacuo
3. customthe residue was purified by flash chromatography (silica gel, 20 g, 0% to 40% ethyl acetate in n-heptane)
4. customThis material was purified by a second chromatography (aminophase 12 g, ethyl acetate/n-heptane 1/1)