Facile and highly selective silylation of vinylpyridines at the β-olefinic carbon by magnesium-promoted reduction
作者:Tianyuan Zhang、Zeyu Zhang、Yutaro Nishiyama、Hirofumi Maekawa
DOI:10.1016/j.tet.2016.03.042
日期:2016.5
Magnesium-promoted reductive silylation of 2- and 4-vinylpyridines with chlorotrialkylsilanes in N-methylpyrrolidinone at room temperature led to the selective formation of a variety of the corresponding β-mono-silylated compounds at the terminal carbon atom in good to excellent yields, whereas silylation of 3-vinylpyridine under the same reduction conditions failed to give a complex mixture of silylated
在室温下,镁在N-甲基吡咯烷酮中用氯三烷基硅烷促进2-和4-乙烯基吡啶的还原甲硅烷基化,从而导致在末端碳原子上选择性形成各种相应的β-单甲硅烷基化化合物,而收率很好,反而更好。在相同的还原条件下使3-乙烯基吡啶甲硅烷基化不能得到甲硅烷基化化合物的复杂混合物。2-或4-乙烯基吡啶与3-乙烯基吡啶之间的结果差异归因于通过与吡啶的氮原子的共振对反应中间体的稳定作用。