反应详情

To a stirred suspension of NaH (3 g, 0.1 mmol, 80% oil dispersion previously washed with hexanes), in THF (75 ml, distilled from Na) was added dropwise neat benzyl alcohol (10.3 g, 0.1 mmol) at rt. Stirring was continued until H2 evolution had ceased, then ethyl 4-chloroacetoacetate (8.23 g, 0.05 mmol) in THF (20 ml) was added dropwise to this solution in a cooling water bath. The reaction was stirred at rt overnight. The mixture was partitioned between ether and 1N HCl, the layers separated, and the aqueous further extracted with ether (x 2). The combined ether extracts were washed twice with water and then brine and dried (Na2SO4), filtered, and concentrated in vacuo to give 17.83 g crude product. Distillation (119-124° C., 0.2 mm Hg) afforded a yellow oil. (7.34 g, 62%)

1. washpreviously washed with hexanes), in THF (75 ml, distilled from Na)
2. stirringThe reaction was stirred at rt overnight
3. customThe mixture was partitioned between ether and 1N HCl
4. customthe layers separated
5. extractionthe aqueous further extracted with ether (x 2)
6. washThe combined ether extracts were washed twice with water
7. dry with materialbrine and dried (Na2SO4)
8. filtrationfiltered
9. concentrationconcentrated in vacuo