反应详情

Ozone was bubbled through a -78° C. dry methanol solution of 2-(allyloxy)benzyl alcohol (LaChapelle et al Tetrahedron, 44(16), 5033-5044 (1988)) (7.0 g, 43 mmol) for 13 minutes, checking the reaction TLC profile every 2 minutes for complete disappearance of the starting olefin (Rf=0.8, 75% EtOAc/hexane). The reaction mixture was purged with nitrogen, NaBH4 (9.7 g, 0.25 mol) was added and the reaction temperature brought to 0° C. After 30 minutes, the reaction was warmed to room temperature, concentrated, diluted with ether, washed with water, brine, dried and concentrated to a residue. The residue was eluted through a pad of silica with EtOAc/hexanes (gradient elution 25%-75% EtOAC). Evaporation of the eluting solvent gave the diol, 2-(2'-hydroxyethoxy)-benzyl alcohol, (4.8 g, 67%) as an oil. MS: MW=168; observed 168, FD, CHCl3).

1. customthe reaction
2. additionwas added
3. custombrought to 0° C
4. concentrationconcentrated
5. additiondiluted with ether
6. washwashed with water, brine
7. customdried
8. concentrationconcentrated to a residue
9. washThe residue was eluted through a pad of silica with EtOAc/hexanes (gradient elution 25%-75% EtOAC)
10. customEvaporation of the eluting solvent