Synthesis of silacycloalkenes and silaspirenes by Ru(II)-catalyzed ring-closing metathesis reactions
作者:Iftikhar Ahmad、Mette Lene Falck-Pedersen、Kjell Undheim
DOI:10.1016/s0022-328x(00)00818-4
日期:2001.4
Cyclisation reactions of dienyl- and enynylsilanes by carbon–carbon bond formation under RCM conditions yield five-, six- and seven-membered silacycloalkenes. The relative ease of ring formation from dienes was in the order six->seven->five-membered rings. A conjugated vinylsilacyclopentene was formed from the corresponding enyne substrate. Silaspirenes have been prepared from silacarbacycles by the
在RCM条件下,二烯基和烯丙基硅烷通过碳-碳键形成的环化反应会生成五元,六元和七元的硅杂环烯。由二烯形成环的相对容易性是六元环>七元环>五元环。由相应的烯炔底物形成共轭乙烯基硅杂环戊烯。西拉维酮通过相同方法从硅碳环化合物制备。在自由基条件下进行的环化得到互补的硅杂环庚烷和硅杂环庚烯产物。闭环通过内触发途径进行。