Alkene-allenecyclopropane radical cyclisations promoted by tris-(trimethylsilyl)silane
作者:Nigel R. Jones、Gerald Pattenden
DOI:10.1016/j.tetlet.2009.03.024
日期:2009.7
butenyl-substituted allenecyclopropanes 5 and 12 with tris-(trimethylsilyl)silane (TTMSS)–AIBN results in facile radical cyclisations into the cyclopropane-carbon centres of the allene moieties, followed by cyclopropane ring-opening and allene isomerisation, leading to the bicyclic 1,3-dienes 10 and 13, respectively. By contrast, treatment of the pentenyl-substituted allenecyclopropane 15a and the iodoethane 18 with
用三-(三甲基甲硅烷基)硅烷(TTMSS)-AIBN处理丁烯基取代的烯丙基环丙烷5和12导致容易的自由基环化成所述烯丙基的环丙烷-碳中心,然后进行环丙烷开环和烯丙基异构化,从而导致双环1,3-二烯10和13。相反,用TTMSS-AIBN处理戊烯基取代的烯丙基环丙烷15a和碘乙烷18,分别导致烷基硅烷16和烯炔21。甲硅烷基化10和13 得到相应的双环烃。