Ester substituted O,Se-acetals are very efficient radical precursors which can be used for intermolecular formation of C-C bonds via phenylseleno group transfer. The nucleophilic nature of the radical intermediates has been demonstrated and good yields were obtained with alkenes substituted by electron-withdrawing groups. Interestingly, the slow rate of phenylseleno group transfer permitted addition to nonactivated olefins. An intramolecular variant of this reaction provides a simple and efficient access to tetrahydrofuran derivatives.
酯取代的 O、Se-
乙醛是非常有效的自由基前体,可用于通过苯基
硒基转移在分子间形成 C-C 键。这种自由基中间体的亲核性已经得到证实,并且在使用被抽电子基团取代的烯烃时获得了良好的产率。有趣的是,苯基
硒基转移速度较慢,因此可以与未活化的烯烃发生加成反应。该反应的分子内变体为获得
四氢呋喃衍
生物提供了简单而有效的途径。