Cyclopropanation of Vinylidenecyclopropanes. Synthesis of 1-(Dihalomethylene)spiropentanes
作者:Hajime Maeda、Takayoshi Hirai、Akira Sugimoto、Kazuhiko Mizuno
DOI:10.1021/jo0301595
日期:2003.10.1
amount of 1-(dihalomethylene)spiropentanes. The efficiency of the thermal rearrangement from the cyclopropylidenecyclopropanes to the 1-(dihalomethylene)spiropentane derivatives depended on the substituents and the reaction temperature. Reaction of diarylvinylidenecyclopropanes with diphenylcarbene and phenylthiocarbene gave the corresponding spiropentane derivatives. This type of thermal rearrangement
描述了通过亚环戊烯通过亚乙烯基环丙烷的丙烷丙烷化而生成的环亚丙基环丙烷来合成1-(二卤代亚甲基)螺戊烷。二芳基亚乙烯基亚环丙烷与二溴卡宾和二氯卡宾的反应以高收率独家得到1-(二卤代亚甲基)螺戊烷。单芳基亚乙烯基环丙烷与二卤代卡宾的反应得到环丙叉基环丙烷为主要产物,并形成少量的1-(二卤代亚甲基)螺戊烷。从环亚丙基环丙烷到1-(二卤代亚甲基)螺戊烷衍生物的热重排效率取决于取代基和反应温度。二芳基亚乙烯基亚环丙烷与二苯基卡宾和苯硫代卡宾的反应得到相应的螺戊烷衍生物。