Various epoxy esters readily reacted with SmI2 (2 equiv) in the presence of ethyl bromoacetate (1 equiv) and HMPA (6 equiv) under mild conditions (THF, −78 °C, 2 h, Ar) providing the corresponding γ-lactones via tandem epoxide opening-cyclization reaction in good to excellent yields.
在温和的条件下(THF,-78°C,2 h,Ar),在
溴乙酸乙酯(1当量)和HMPA(6当量)存在下,各种环氧酯容易与SmI 2(2当量)反应,提供相应的γ-内酯通过串联
环氧化物开环反应,收率良好。