反应详情

Dissolve dl-13-ethyl-3-methoxy-6-methylgona-2,5(10)-dien-17β-ol (5.5 g) in toluene (200 ml) containing cyclohexanone (70 ml) and treat with aluminum isopropoxide (4.0 g) in toluene (50 ml). Reflux under nitrogen for 2.5 hours, then add water (10 ml) followed by anhydrous sodium sulfate (5 g). Stir the suspension for 0.5 hour, filter, and wash the filter cake with benzene. Remove the solvents and concentrate the residue at 100° under vacuum (.02 mm). Triturate the crystalline residue with ice-cold methanol to obtain dl-13β-ethyl-6-methyl-3-methoxygona-2,5(10)-dien-17-one (3.6 g), m.p. 118°-125°; infrared absorption peaks (potassium bromide) at 5.78 μ, 5.90 μ, 6.00 μ, no selective ultraviolet absorption above 220 mμ.

1. temperatureReflux under nitrogen for 2.5 hours
2. filtrationfilter
3. washwash the filter cake with benzene
4. customRemove the solvents
5. concentrationconcentrate the residue at 100° under vacuum (.02 mm)
6. customTriturate the crystalline residue with ice-cold methanol