在氩气保护下 ,于 - 78℃向 α-溴代环缩醛 (缩酮 )或 α-溴代环硫缩酮中滴加 Sm I2 溶液 ,搅拌 10 m in后 ,加入氯化铵溶液 ,提取纯化后得相应羟基或巯基的烯醇醚 ,9例收率81%～ 92 %。α-溴代环缩醛(缩酮)用二碘化钐转化成烯醇醚@隋强 Sm I2 solution was added dropwise to α-bromocyclic acetal (ketal) or α-bromothioketal under argon at -78 ° C. After stirring for 10 min, ammonium chloride solution was added, Extraction of the corresponding hydroxyl or mercapto purified enol ether, 9 cases yield 81% ~ 92%. Alpha-bromocyclic acetals (ketals) are converted to enol ethers using samarium diiodide @ Sui