Triethylborane-Induced Radical Cyclization of 1-Allyloxy-2-halosilacyclopentane. Stereoselective Synthesis of 1,3,6-Triols Starting from Silacyclobutane
作者:Kozo Matsumoto、Katsukiyo Miura、Koichiro Oshima、Kiitiro Utimoto
DOI:10.1246/bcsj.68.625
日期:1995.2
1-Allyloxy-2-bromo-1-phenylsilacyclopentane was synthesized by a ring-enlargement reaction of 1-allyloxy-1-phenylsilacyclobutane with LiCHBr2. The treatment of 1-allyloxy-2-bromo-1-phenylsilacyclopentane with n-Bu3SnH in the presence of a catalytic amount of Et3B provided 2-oxa-1-silabicyclo[3.3.0]octane, which was converted into 1,3,6-triol by an oxidative cleavage of silicon–carbon bonds with H2O2. An intermolecular radical addition of 2-iodosilacyclopentane to acetylenic compounds afforded the corresponding iodoalkenes.
1- 烯丙氧基-2-溴-1-苯基硅杂环戊烷是通过 1- 烯丙氧基-1-苯基硅杂环丁烷与 LiCHBr2 的扩环反应合成的。1-allyloxy-2-bromo-1-phenylsilacyclopentane 与 n-Bu3SnH 在催化量 Et3B 的存在下进行处理,可得到 2-oxa-1-silabicyclo[3.3.0]octane,后者通过 H2O2 氧化裂解硅碳键转化为 1,3,6-三醇。将 2-iodosilacyclopentane 与乙炔化合物进行分子间自由基加成,可得到相应的碘烯烃。