[O:1]1[CH:6]2[CH:2]1[CH2:3][O:4][CH2:5]2.[CH2:7]([OH:14])[C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1.Cl([O-])(=O)(=O)=O.[Mg+2].Cl([O-])(=O)(=O)=O>C(#N)C(C)C>[CH2:7]([O:14][C@H:6]1[C@H:2]([OH:1])[CH2:3][O:4][CH2:5]1)[C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1To a flask fitted with a condenser and nitrogen inlet was added 3,4-epoxytetrahydrofuran (20 g, 0.23 mol), isobutyronitrile (100 ml, 5 vol), benzyl alcohol (124 g, 1.15 mol, 5 eq.) and finally magnesium perchlorate (10.3 g, 0.046 mol, 0.2 eq). The solution was heated at 100° C. for 24 hours. After cooling to room temperature, the reaction was quenched with water (1000 mL). The phases were separated and the aqueous phase was extracted with ethyl acetate (3×400 mL). After drying the organic phases over MgSO4, filtering and concentrating in vacuo, the trans-3-benzyloxy-4-hydroxytetrahydrofuran was isolated by column chromatography to give 29 g (66% yield) of a clear colorless liquid.
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