important iodohydrin intermediate has been accomplished by a highly efficient reaction of an epoxide with LiI catalysed by BF3.Et2O in THF. Displacement of the resulting neopentyl iodide was achieved in high yield by reaction of the iodide with potassium superoxide in dimethylsulphoxide/tetrahydrofuran in the presence of 18-crown-6.
描述了在C-2处带有羟甲基的双-螺
缩醛(15)的合成,建立了制备聚醚抗生素
沙利霉素和
萘灵的方法。重要的
碘代醇中间体的形成是通过BF 3 .Et 2 O在THF中催化的
环氧化物与LiI的高效反应来完成的。通过在
18-冠-6存在下,使
碘化物与超氧化
钾在
二甲亚砜/
四氢呋喃中反应,以高收率实现所得
新戊基碘的置换。