反应详情

温度

70 °C

Potassium carbonate (28.0 g.) was added to a stirred solution of t-butyl ethyl malonate (37.6 g.) in dry N,N-dimethylformamide (DMF) (100 ml.). After 1 hour allyl bromide (34 ml.) was added. The mixture was heated at 70° C. for 66 hours, cooled to room temperature and diluted with water (900 ml.). The mixture obtained was extracted with ethyl acetate (3×200 ml.). The extracts were dried (MgSO4) and evaporated. The oil obtained was purified by flash column chromatography eluting with 1:15 v/v ethyl acetate/petroleum ether (b.p. 60°-80° C.) to give t-butyl ethyl 2-allylmalonate as a colourless oil (15.6 g.), b.p. 70°-72° C. at 0.2 mmHg; NMR: 1.21 (3H,t), 1.42 (9H,s), 2.66 (2H,m), 3.28 (1H,m), 4.16 (2H,q), 5.06 (2H,m) and 5.76 (1H,m) ppm.

1. temperaturecooled to room temperature
2. customThe mixture obtained
3. extractionwas extracted with ethyl acetate (3×200 ml.)
4. dry with materialThe extracts were dried (MgSO4)
5. customevaporated
6. customThe oil obtained
7. customwas purified by flash column chromatography
8. washeluting with 1:15 v/v ethyl acetate/petroleum ether (b.p. 60°-80° C.)