[F:1][C:2]1[CH:3]=[C:4]([OH:9])[CH:5]=[C:6]([F:8])[CH:7]=1.[O:10]1[CH2:15][CH2:14][CH2:13][CH:12](O)[CH2:11]1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.CC(OC(/N=N/C(OC(C)C)=O)=O)C>C1COCC1>[F:1][C:2]1[CH:3]=[C:4]([CH:5]=[C:6]([F:8])[CH:7]=1)[O:9][CH:12]1[CH2:13][CH2:14][CH2:15][O:10][CH2:11]1A solution of 3,5-difluorophenol (1.15 g, 8.81 mmol), tetrahydro-2H-pyran-3-ol (0.900 g, 8.81 mmol), triphenylphosphine (2.31 g, 8.81 mmol) and DIAD (1.74 mL, 8.81 mmol) in THF (10 mL) was stirred overnight. The solution was then concentrated under reduced pressure and the residue was purified by purified by column chromatography on silica gel using CombiFlash® apparatus eluting with EtOAc/hexanes (0-30%). The purification afforded 1.43 g (75.8%) of the sub-title compound as a colorless oil.
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