[reaction: see text] Mild Ni(0)-catalyzed rearrangements of 1-acyl-2-vinylcyclopropanes have been developed. The room-temperature isomerizations afford dihydrofuran products in yields regularly greater than 90%. A highly substituted, stereochemically defined cyclopropane was employed in the rearrangement to evaluate the reaction mechanism. Product analysis indicates that the overall reaction proceeds
[反应:见正文]已经开发了轻度的Ni(0)催化的1-酰基-2-
乙烯基环丙烷重排反应。室温异构化得到二氢
呋喃产物,其产率通常大于90%。在重排中使用高度取代的立体
化学定义的
环丙烷来评估反应机理。产物分析表明,总体反应在保持
乙烯基的立体异构中心的构型进行的情况下进行。