反应详情

A mixture of benzyl bromide (1.54 mL, 13.0 mmol), potassium carbonate (3.58 g, 25.9 mmol), and (4S,7R)-2-phenyl-7,8,8-trimethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one (Intermediate 6; 1.74 g, 6.5 mmol) in acetone (20 mL) and methanol (3 mL) was heated at reflux overnight, then a further portion of benzyl bromide (0.75 mL, 6.3 mmol) was added and the reaction mixture was allowed to stir at room temperature over the weekend. The solvent was evaporated and the residue was partitioned between water and dichloromethane. The organic layer was evaporated and the residue was chromatographed (0-50% ethyl acetate/hexanes), and recrystallized from ethyl acetate/hexanes to give (4S,7R)-1-benzyl-7,8,8-trimethyl-2-phenyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one (94 mg, 3%) as a white solid. APCI-MS (M+H) 359.

1. temperaturewas heated
2. temperatureat reflux overnight
3. customThe solvent was evaporated
4. customthe residue was partitioned between water and dichloromethane
5. customThe organic layer was evaporated
6. customthe residue was chromatographed (0-50% ethyl acetate/hexanes)
7. customrecrystallized from ethyl acetate/hexanes