反应详情

10.7 mmol of the compound obtained in Step E of Preparation 1 in 20 ml of anhydrous THF are placed in the presence of 1.2 eq of NaH (60% in oil) in 25 ml of anhydrous THF and of 1.2 eq of ethyl 3-(diethoxyphosphoryl)propanoate. The title compound is obtained after 3 hours' stirring at room temperature and gentle refluxing overnight.