反应详情

To a suspension of sodium hydride (3.6 g, 60% suspension, 90 mmol) in benzene (100 mL), a mixture of ethyl formate (12.5 g) and 2-isopropyl-3-methoxy-cyclohex-2-enone (5g, 29.7 mmol) in benzene was added dropwise at 5° C. The reaction mixture was stirred at ice temperature for 1 hour, and at room temperature for 18 hours. The reaction mixture was cooled in an ice bath, and 10% sodium hydrogen phosphate solution (200 mL) was added dropwise. The organic layer was separated, and the aqueous layer was extracted with ethyl acetate (2×50 mL). The combined organic layers were washed with brine and dried over anhydrous sodium sulfate. The solvent was removed in vacuo, and the resulting product was purified on a column of silica gel (Hex:EtOAc) to give the title compound as a thick viscous liquid (3.5 g, 60%). 1H NMR (CDCl3): δ 1.15 (d, 6H, 2×CH3), 2.35–2.6 (m, 4H, 2×CH2), 3.15 (m, 1H, CH), 3.8 (s, 3H, OCH3), 7.17 (d, 1H, ═CHOH).

1. additionwas added dropwise at 5° C
2. waitat room temperature for 18 hours
3. temperatureThe reaction mixture was cooled in an ice bath
4. customThe organic layer was separated
5. extractionthe aqueous layer was extracted with ethyl acetate (2×50 mL)
6. washThe combined organic layers were washed with brine
7. dry with materialdried over anhydrous sodium sulfate
8. customThe solvent was removed in vacuo
9. customthe resulting product was purified on a column of silica gel (Hex:EtOAc)