反应详情

To a solution of 1,4-cyclohexanedione mono-ethylene ketal (30.0 g, 192 mmol) and nitromethane (15.6 mL, 288 mmol) in ethanol (18 mL) was added a solution of sodium ethoxide in ethanol (2.67 M, 3.4 mL, 9.6 mmol). The solution was stirred at room temperature (rt) for 5 days (d), then was concentrated under reduced pressure to a brown oil that was partitioned between water (100 mL) and dichloromethane (100 mL). The aqueous layer was extracted with dichloromethane (3×100 mL). The organic layers were combined, dried over Na2SO4, filtered, and concentrated to a light brown oil. Purification by flash chromatography (silica gel, 40% ethyl acetate/hexanes) provided the product 8-(nitromethyl)-1,4-dioxaspiro[4.5]decan-8-ol as a clear oil (16.7 g, 40%) that slowly formed clear crystals overnight.

1. concentrationwas concentrated under reduced pressure to a brown oil that
2. customwas partitioned between water (100 mL) and dichloromethane (100 mL)
3. extractionThe aqueous layer was extracted with dichloromethane (3×100 mL)
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated to a light brown oil
7. customPurification by flash chromatography (silica gel, 40% ethyl acetate/hexanes)