反应详情

A mixture of 25 g of ethyl 2-methylacetoacetate, 64 mL of a 21% sodium ethoxide solution in ethanol and 34 mL of ethyl 6-bromohexanoate is refluxed in 200 mL of ethanol overnight. The mixture is filtered and solvent is evaporated. The residue is partitioned between 1 M HCl and chloroform. The organic layer is dried over magnesium sulfate and purified on silica gel using 1:10 ethyl acetate/hexanes as eluant to yield 22 g of ethyl 2-(5-carbethoxypentyl)-2-methylacetoacetate.

1. filtrationThe mixture is filtered
2. customsolvent is evaporated
3. customThe residue is partitioned between 1 M HCl and chloroform
4. dry with materialThe organic layer is dried over magnesium sulfate
5. custompurified on silica gel using 1:10 ethyl acetate/hexanes as eluant