Halide-promoted pyridinylation between α-acyl sulfonylmethylides and 2-halo-1-methylpyridinium iodides in a transition-metal-free protocol is described. A broad range of α-acyl sulfonylmethylides were transformed to bifunctionalized vinylsulfones in moderate to good yields, thereby providing a facile and practical approach for constructing methylthio- and pyridinoxyl-substituted vinylsulfones. The
描述了在无过渡
金属方案中卤化物促进的 α-酰基磺酰甲基化物和 2-halo-1-
甲基吡啶碘化物之间的
吡啶基化。多种 α-酰基磺酰基甲基化物以中等至良好的收率转化为双官能化
乙烯基砜,从而为构建甲
硫基和
吡啶氧基取代的
乙烯基砜提供了一种简便实用的方法。底物可以扩展到其他酰基甲基化物。该反应表明需要形成 C-O 键和 C-S、C-Cl 和 C-N 键的连续断裂。