反应详情

温度

0 °C

2-Ethyl-4-[6-ethyl-7-methyl-3-oxo-4-(2-trimethylsilanyl-ethoxy)-1,3-dihydro-isobenzofuran-5-yl]-but-2-enal (50.3 mg, 0.129 mmol) was dissolved in MeOH (3 mL). A solution of CeCl3 (31.9 mg, 0.129 mmol) in MeOH/water (9/1, 0.66 mL) was added and the solution was cooled to 0° C. A solution of lithium borohydride in THF (2M, 0.065 mL) was added dropwise. After 10 minutes, the reaction was quenched with 1N HCl (0.5 mL). The methanol was removed in vacuo and the crude material was partitioned between DCM and water. The aqueous layer was extracted with DCM and the combined organic layers were washed with sodium bicarbonate solution and were dried over sodium sulfate. Filtration and evaporation of solvents in vacuo yielded a crude oil, which was purified by silica gel chromatography to provide 35.4 mg (70%) of the desired product. 1H NMR (300 MHz, CDCl3): δ=0.04 (s, 9H), 1.10-1.19 (m, 6H), 1.26 (m, 2H), 2.19 (s, 3H), 2.32 (q, J=7.5 Hz, 2H), 2.72 (q, J=7.5 Hz, 2H), 3.54 (d, J=6.6 Hz, 2H), 4.05 (s, 2H), 4.26 (m, 2H), 5.14 (s, 2H), 5.27 (m, 1H) ppm.

1. customthe reaction was quenched with 1N HCl (0.5 mL)
2. customThe methanol was removed in vacuo
3. customthe crude material was partitioned between DCM and water
4. extractionThe aqueous layer was extracted with DCM
5. washthe combined organic layers were washed with sodium bicarbonate solution
6. dry with materialwere dried over sodium sulfate
7. filtrationFiltration and evaporation of solvents in vacuo
8. customyielded a crude oil, which
9. customwas purified by silica gel chromatography