Synthesis of Fused Bromofurans via Mg-Mediated Dibromocyclopropanation of Cycloalkanone-Derived Chalcones and Cloke–Wilson Rearrangement
作者:Elumalai Gopi、Irishi N. N. Namboothiri
DOI:10.1021/jo3022988
日期:2013.2.1
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。