反应详情

A chilled (0° C.) solution of N-methylmorpholine N-oxide (3.11 g, 26.5 mmol) and tetrapropylammonium perrethenate (VII) (0.280 g, 0.796 mmol) in DCM (40 mL) was prepared containing 4 Å molecular sieves (ca 0.3 g). A solution of (±)-6,6-dimethyl-bicyclo[3.1.0]hexan-2-ol (1.67 g, 13.3 mmol) in DCM (10 mL) was added dropwise and the solution allowed to warm to room temperature and stirred for 1 hour under argon. The solution was filtered through a silica plug, solvent removed under reduced pressure and the resulting oil purified by column chromatography (0–100% DCM/n-hexane, silica). 6,6-Dimethyl-bicyclo[3.1.0]hexan-2-one was obtained as a brown oil. 1H NMR (CDCl3): δ 2.35–2.15 (m, 2H), 2.10–2.00 (m, 1H), 1.97–1.85 (m, 2H), 1.66 (d, 1H, J=4.7), 1.16 (s, 3H), 1.12 (s, 3H).

1. customwas prepared
2. additioncontaining 4 Å molecular sieves (ca 0.3 g)
3. filtrationThe solution was filtered through a silica plug, solvent
4. customremoved under reduced pressure
5. customthe resulting oil purified by column chromatography (0–100% DCM/n-hexane, silica)