dibromocyclopropanation of alkylidenecycloalkanone followed by acidic alumina-mediated regioselective ring expansion of the cyclopropyl ketone. The scope of the reaction was investigated using alkylidenecycloalkanones derived from tetralone, indanone, and benzosuberone to afford 2-aryl-3-bromofurans fused to various benzocycloalkanes. Representative examples of stereoconvergent dibromocyclopropanation and
报道了将亚烷基环烷酮转化为
溴呋喃的方便的两步序列。这些步骤包括Mg介导的亚烷基环烷酮的非对映选择性二
溴环丙烷化,然后是酸性氧化铝介导的环丙基酮的区域选择性环的扩环。使用衍生自四氢
萘酮,
茚满酮和苯并亚砜的亚烷基环烷酮研究了反应范围,得到了与各种苯并环
烷烃稠合的2-芳基-
3-溴呋喃。还报道了
呋喃苯并环
烷烃的立体收敛性二
溴环丙烷化和总芳构化的代表性实例。