反应详情

To an ice-cooled solution of (1S)-1,8,8-trimethylbicyclo[3.2.1]octane-2,4-dione (0.36 g, 2.0 mmole), triethylamine (0.20 g, 2.0 mmole) and 4-(dimethylamino)pyridine (0.24 g, 2.0 mmole) in dry dichloromethane (20 mL) was added a solution of 4-(trifluoromethyl)phenyl isocyanate (0.41 g, 2.2 mmole) in dry dichloromethane (3 mL). The resulting reaction mixture was allowed to stir overnight under a nitrogen atmosphere, during which time it came up to room temperature. The resulting mixture was concentrated on a rotary evaporator and then partitioned between dichloromethane and 2N aqueous HCl. The acidic aqueous layer was extracted with two additional portions of dichloromethane. The combined organic layers were dried over anhydrous sodium sulfate and concentrated on a rotary evaporator to give a yellow oil, which was purified by chromatography on silica gel (10% ethyl acetate/hexane) to yield the title compound as an orange solid (0.36 g, 49% yield), mp=81–83° C.; MS (−) ESI m/z=366 (M−H)−; [α]D25=−25.6° (c=1, EtOH).

1. customThe resulting reaction mixture
2. customcame up to room temperature
3. concentrationThe resulting mixture was concentrated on a rotary evaporator
4. custompartitioned between dichloromethane and 2N aqueous HCl
5. extractionThe acidic aqueous layer was extracted with two additional portions of dichloromethane
6. dry with materialThe combined organic layers were dried over anhydrous sodium sulfate
7. concentrationconcentrated on a rotary evaporator
8. customto give a yellow oil, which
9. customwas purified by chromatography on silica gel (10% ethyl acetate/hexane)