反应详情

温度

100 °C

To a solution of 3-(4-benzyloxy-2-methyl-phenyl)-2-ethoxy-3-hydroxy-propionic acid ethyl ester (mixture of stereoisomers; 48.8 g, 136.2 mmol) in N,N-dimethylformarrd (500 ml) was added sulfuric acid (19.6 ml, 96%). The reaction mixture was heated to 100° C. for 2.5 h, cooled to ambient temperature, poured onto ice water/saturated aqueous NaHCO3 solution 1/1 and extracted two times with ethyl acetate. The combined extracts were washed with ice water/brine 1/1 and dried over sodium sulfate. The solvent was removed under reduced pressure to give 46.1 g (135.4 mmol) of crude (Z)-3-(4-benzyloxy-2-methyl-phenyl)-2-ethoxy-acrylic acid ethyl ester which was used in the next step without further purification.

1. temperaturecooled to ambient temperature
2. additionpoured onto ice water/saturated aqueous NaHCO3 solution 1/1
3. extractionextracted two times with ethyl acetate
4. washThe combined extracts were washed with ice water/brine 1/1
5. dry with materialdried over sodium sulfate
6. customThe solvent was removed under reduced pressure