反应详情

(±)-{3-[2,4-Bis(methoxymethoxy)phenyl]cyclohexyl}methanol (35 mg) was heated at 50° C. in methanol (3.5 ml) containing acidic ion exchange resin (350 mg). After 6 hr, the mixture was filtered, the resin was washed with ethyl acetate, and the combined filtrate and washings were evaporated in vacuo. The crude residue was purified by flash column chromatography (SiO2, ethyl acetate/petrol, 1:1 v/v) to furnish a mixture of diastereoisomers of the title compound as a white solid (2 mg, 8%). δH (d4-MeOH) 0.9-1.9 (9H, overlapping m), 2.80 (0.5H, m), 2.90 (0.5H, m), 3.20-3.40 (2H, overlapping m), 6.15 (2H, m), 6.80 (0.5H, d), 6.85 (0.5H, d); m/z (ES−) 221 (M−H)−.

1. filtrationthe mixture was filtered
2. washthe resin was washed with ethyl acetate
3. customthe combined filtrate and washings were evaporated in vacuo
4. customThe crude residue was purified by flash column chromatography (SiO2, ethyl acetate/petrol, 1:1 v/v)
5. customto furnish