反应详情

6,7-Dihydroxy-1-methoxy-5,6,7,8-tetrahydro-5,8-methano-benzocyclohepten-9-one (2.80 g, 12 mmol) was stirred at 0° C. in dichloromethane (15 mL) and treated with lead tetraacetate (Pb(OAc)4, 5.35 g, 12 mmol). After 30 min. the mixture was filtered through a Celite™ pad and rinsed with dichloromethane (50 mL). To the stirred filtrate was added AcOH (3.61 g, 60 mmol) and allyl amine (689 mg, 12 mmol). After 15 min., the mixture was treated with NaBH(OAc)3 (7.70 g, 36 mmol) and stirred for 18 h. The mixture was poured into a saturated aqueous Na2CO3 solution (100 mL) stirred for 30 min. The layers were separated and extracted with EtOAc (2×100 mL). The organic layer was washed with a saturated aqueous Na2CO3 solution (2×50 mL), H2O (50 mL), saturated aqueous NaCl solution (50 mL), dried over MgSO4, filtered and concentrated to an oil. Purification by chromatography on silica gel eluting with 5% EtOAc/hexanes provided product as an oil (885 mg, 29%). (TLC 30% EtOAc/hexanes Rf 0.67).

1. filtrationAfter 30 min. the mixture was filtered through a Celite™ pad
2. washrinsed with dichloromethane (50 mL)
3. stirringstirred for 30 min
4. customThe layers were separated
5. extractionextracted with EtOAc (2×100 mL)
6. washThe organic layer was washed with a saturated aqueous Na2CO3 solution (2×50 mL), H2O (50 mL), saturated aqueous NaCl solution (50 mL)
7. dry with materialdried over MgSO4
8. filtrationfiltered
9. concentrationconcentrated to an oil
10. customPurification by chromatography on silica gel eluting with 5% EtOAc/hexanes provided product as an oil (885 mg, 29%)