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温度

0 °C

To a solution of LDA (2.0M solution in heptanes/tetrahydrofuran/ethylbenzene, 500 ml) in tetrahydrofuran (2 L) at 0° C. was added ethyl acetoacetate (62 ml). After 40 min 3-chlorobenzyl bromide (100 g) was added dropwise and the mixture was stirred at 0° C. for 1 hour. The reaction mixture was acidified with 2N HCl and the organic phase was concentrated under reduced pressure. The residue was dissolved in ethyl acetate and washed with water and brine, dried (MgSO4) and evaporated. Purification was by chromatography eluting with 5-10% ethyl acetate in isohexane.

1. concentrationthe organic phase was concentrated under reduced pressure
2. dissolutionThe residue was dissolved in ethyl acetate
3. washwashed with water and brine
4. dry with materialdried (MgSO4)
5. customevaporated
6. customPurification
7. washeluting with 5-10% ethyl acetate in isohexane