Halogen and Chalcogen Cation Pools Stabilized by DMSO. Versatile Reagents for Alkene Difunctionalization
作者:Yosuke Ashikari、Akihiro Shimizu、Toshiki Nokami、Jun-ichi Yoshida
DOI:10.1021/ja4092648
日期:2013.10.30
resulting cation pools of X(+) increased in the order of Br(+) < I(+) < ArS(+) < ArSe(+), which could be explained in terms of the electronegativity of X. The cation pools served as versatile reagents for organic synthesis; the reactions with alkenes gave β-X-substituted alkoxysulfonium ions, which were converted to the corresponding carbonyl compounds by the treatment with triethylamine, whereas the treatment
卤素和硫属元素阳离子(X(+) = Br(+)、I(+)、ArS(+) 和 ArSe(+)) 是在二甲基亚砜 (DMSO) 存在下通过低温电化学氧化生成的,并且是溶液中积累。DFT 计算表明 DMSO 通过配位稳定这些阳离子。通过冷喷雾电离 MS 分析观察到 I(+) 与一个和两个 DMSO 分子的复合物。X(+) 阳离子池的稳定性以 Br(+) < I(+) < ArS(+) < ArSe(+) 的顺序增加,这可以用 X 的电负性来解释。阳离子池作为有机合成的通用试剂;与烯烃的反应得到 β-X-取代的烷氧基锍离子,通过用三乙胺处理将其转化为相应的羰基化合物,而用甲醇处理得到相应的醇。与氨基烯烃和 1,6-二烯反应得到环化产物。