反应详情

A mixture of methyl 2-cyano-3-phenylbutyrate (78 g, 0.37 mole), methyl 2,4-dibromobutyrate (122 g, 0.47 mole), potassium carbonate (65 g, 0.47 mole) and DMSO (50 ml) was stirred on a ball mill apparatus. The reaction was completed in four hours. Ice water was added and the mixture was neutralized by adding cold hydrochloric acid. The aqueous solution was extracted several times with ether. The combined organic solution was washed sequentially with cold aqueous sodium bicarbonate and brine, then dried over magnesium sulfate. After removal of the solvent, the residue was purified by Kugelrohr distillation (100° C., 30 microns) to remove low boiling materials. The remaining oily residue (118 g., 84%) was found to be mainly the title bromide condensation product (μ<95% GC purity). MS m/e (% relative intensity) 383(M.+, 3) 381 (3), 202 (33), 182 (7), 180 (7), 105 (100).

1. extractionThe aqueous solution was extracted several times with ether
2. washThe combined organic solution was washed sequentially with cold aqueous sodium bicarbonate and brine
3. dry with materialdried over magnesium sulfate
4. customAfter removal of the solvent
5. distillationthe residue was purified by Kugelrohr distillation (100° C., 30 microns)
6. customto remove low boiling materials
7. customthe title bromide condensation product (μ<95% GC purity)