Vinyl polymerization versus [1,3] O to C rearrangement in the ruthenium-catalyzed reactions of vinyl ethers with hydrosilanes
作者:Nari-aki Harada、Takashi Nishikata、Hideo Nagashima
DOI:10.1016/j.tet.2012.02.025
日期:2012.4
reaction does not give the polyvinyl ether but results in [1,3] O to C rearrangement to give the corresponding aldehyde, RCH2CHO in moderate to good yields. The rearrangement selectively proceeds when vinyl ethers having α-substituents are used as the starting materials to give the corresponding ketones in high yields. With catalytic amounts of hydrosilanes, the rearrangement gives ketones or aldehydes selectively
在钌催化的氢化硅烷反应中,研究了乙烯基聚合和乙烯基醚的[1,3] O到C重排这两个反应。反应途径取决于乙烯基醚的取代基,特别是烷氧基的取代基。伯,仲和叔烷基乙烯基醚ROCH CH 2容易聚合,以高收率得到相应的聚合物。当R是给电子的苄基时,该反应未得到聚乙烯基醚,但导致[1,3] O至C重排,得到相应的醛RCH 2CHO的产量中等至良好。当使用具有α-取代基的乙烯基醚作为起始原料以高产率得到相应的酮时,选择性地进行重排。在催化量的氢硅烷的情况下,重排选择性地产生了酮或醛。形成鲜明对比的是,使用过量的氢硅烷导致重排,随后还原形成的羰基以良好的产率得到相应的甲硅烷基醚。讨论了催化活性物质的性质。