反应详情

To a suspension of NaH (0.212 g, 5.29 mmol) in THF (2 mL) was added a solution of triethyl 2-phosphonopropionate (1.05 mL, 5.29 mmol) in THF (2 mL) at 0° C. After the mixture was stirred for 1 h at rt, a solution of tert-butyl-3,3-dimethyl-4-oxopiperidine-1-carboxylate (J. Org. Chem., 2001, 66, 2487) (0.600 g, 2.64 mmol) in THF was then added and stirred for 10 h. The resulting mixture was quenched with water and the product portion was extracted with Et2O. The combined extracts were washed with brine, dried (Na2SO4), filtered and concentrated in vacuo. The residue was purified by SiO2 chromatography (gradient: 5% EtOAc/hexane to 40% EtOAc/hexane) to afford the titled compound (784 mg, ˜100%); 1H NMR (CDCl3) δ 5.73 (s, 1H), 4.15 (q, J=6.8 Hz, 2H), 3.52-3.42 (m, 2H), 3.25-3.18 (m, 2H), 3.05 (t, J=5.6 Hz, 2H), 1.47 (s, 9H), 1.29 (t, J=6.8 Hz, 3H), 1.12 (s, 6H)

1. stirringstirred for 10 h
2. customThe resulting mixture was quenched with water
3. extractionthe product portion was extracted with Et2O
4. washThe combined extracts were washed with brine
5. dry with materialdried (Na2SO4)
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe residue was purified by SiO2 chromatography (gradient: 5% EtOAc/hexane to 40% EtOAc/hexane)