反应详情

温度

60 °C

In a 250 ml three necked flask fitted with a magnetic stirrer, under inert atmosphere, a mixture of 4-propyl-pyrrolidin-2-one (0.5 g, 3.9 mmol) and ethyl glyoxylate (50% in toluene, 2.4 ml, 11 mmol) in acetone is heated up at 60° C. for 6 h and another portion of ethyl glyoxylate (0.4 ml) is added. After 17 h at 50° C., the reaction mixture is concentrated in vacuo to give the crude hydroxy-(2-oxo-4-propyl-pyrrolidin-1-yl)-acetic acid ethyl ester a19 (2.02 g). It is used in the next step without any further purification.

1. concentrationthe reaction mixture is concentrated in vacuo