Synthesis of Methylenebicyclo[3.2.1]octanol by a Sm(II)-Induced 1,2-Rearrangement Reaction with Ring Expansion of Methylenebicyclo[4.2.0]octanone
作者:Kazuhiko Takatori、Shoya Ota、Kenta Tendo、Kazuma Matsunaga、Kokoro Nagasawa、Shinya Watanabe、Atsushi Kishida、Hiroshi Kogen、Hiroto Nagaoka
DOI:10.1021/acs.orglett.7b01604
日期:2017.7.21
Direct conversion of methylenebicyclo[4.2.0]octanone to methylenebicyclo[3.2.1]octanol by a Sm(II)-induced 1,2-rearrangement with ring expansion of the methylenecyclobutane is described. Three conditions were optimized to allow the adaptation of this approach to various substrates. A rearrangement mechanism is proposed involving the generation of a ketyl radical and cyclopentanation by ketyl–olefin
描述了由Sm(II)诱导的1,2-重排与亚甲基环丁烷的扩环,将亚甲基双环[4.2.0]辛酮直接转化为亚甲基双环[3.2.1]辛醇。优化了三个条件,以使该方法适用于各种基材。提出了一种重排机制,涉及通过酮基-烯烃环化生成酮基自由基和环戊烷化,然后进行自由基裂解和随后的质子化。