5-endo-trig selenoetherifications of substituted 2-silyl-3-alkenols gave tri- or tetrasubstituted 2,4-cis tetrahydrofurans in moderate to good yields with excellent diastereoselectivities. Opposite stereoselectivities were found with an analogous allylic diol. A transition state model has been proposed to rationalize this stereochemical outcome.
5 -内trig的取代的2-甲
硅烷基-3-烯醇的selenoetherifications得到三-或四取代的2,4-顺式的
四氢呋喃在中度至良好的产率具有优良的非对映选择性。发现与类似的烯丙基二醇相反的立体选择性。已经提出了过渡状态模型来合理化这种立体
化学结果。