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0 °C

trans-2-(3-Hydroxy-but-1-ynyl)-5-(4-fluorophenyl) tetrahydrofuran (205, 210 mg, 0.89 mmol), triphenylphosphine (288 mg, 1.1 mmol) and N,O-bis(phenoxycarbonyl)hydroxylamine (283 mg, 1.1 mmol) were dissolved in dry THF (5 mL). The solution was cooled to 0° C. under dry argon, and diisopropylazodicarboxylate (216 mL, 1.1 μmol) was added dropwise. Stirring was continued for 1 hour at the same temperature. The solvent was evaporated and the residue was purified via flash column chromatography (eluent, 30% ethyl acetate in hexane) to yield 250 mg (57%) of trans-2-{3-(N-phenoxycabonyloxy-N-phenoxycarbonyl-amino)-but-1-ynyl}-5-(4-fluorophenyl) tetrahydrofuran (206). 1H-NMR (CDCl3) δ 7.15-7.45 (12H, m), 7.02 (2H, t, J=8.6 Hz), 5.32 (1H, q J=7.0 Hz), 5.07 (1H, t, J=6.8 Hz), 4.96 (1H, t, J=5.7 Hz), 2.25-2.50 (2H, m), 2.05-2.20 (1H, m), 1.70-1.85 (1H, m), 1.66 (3H, d, J=7.0 Hz).

1. customThe solvent was evaporated
2. customthe residue was purified via flash column chromatography (eluent, 30% ethyl acetate in hexane)