Synthesis and Lewis acid assisted rearrangement of novel donor-acceptor substituted cyclopropanes: Highly stereoselective [4+1] annulation approach to substituted and spiro cyclopentene derivatives
作者:Janagani Satyanarayana、Mandava V. Basaveswara Rao、Hiriyakkanavar Ila、Hiriyakkanavar Junjappa
DOI:10.1016/0040-4039(96)00622-3
日期:1996.5
The cyclopropanes 2a-h having 4-(bismethylthio)butadienyl moiety as donor group, which are easily obtained by regioselective cyclopropanation of vinylogous ketene dithioacetals 1a-h with oxodimethylsulphonium methylide, undergo facile Lewis acid assisted vinylcyclopropyl rearrangement to afford substituted and spiro cyclopentenes 3a-h in good yields.
具有4-(双甲硫基)丁二烯基部分作为供体基团的环丙烷2a-h,可以容易地通过乙烯基二氧乙烯酮二硫缩醛1a-h与氧代二甲基磺酸ium的区域选择性环丙烷化而制得,并容易地进行路易斯酸辅助的乙烯基环丙基重排,得到取代的和螺环戊烯3a-。 h高产。