反应详情

温度

20 °C

The procedure is as in Example 2, starting with diethyl 5-benzylthio-2-dimethylamino-2,4-hexadienedioate (10 g) and 1N aqueous hydrochloric acid solution (41.3 cc) in ethanol (41.3 cc). The mixture is heated to boiling for 2 minutes, and then cooled to a temperature in the region of 20° C. After purification by chromatography on a silica column with a mixture of cyclohexane and ethyl acetate (30:70 by volume) as eluent, diethyl 5-benzylthio-2-hydroxy-2,4-hexadienedioate (6.3 g) (m.p. <40° C.) is obtained [Rf=0.6; thin layer chromatography on silica gel; eluent: cyclohexane/ethyl acetate (30:70 by volume)].

1. temperatureThe mixture is heated
2. customAfter purification by chromatography on a silica column
3. additionwith a mixture of cyclohexane and ethyl acetate (30:70 by volume) as eluent