Synthesis of benzo- and naphtho-fused bicyclo[n.3.1]alkane frameworks with a bridgehead nitrogen function by palladium-catalyzed intramolecular α′-arylation of α-nitroketones
作者:Giorgio Giorgi、Swarupananda Maiti、Pilar López-Alvarado、J. Carlos Menéndez
DOI:10.1039/c0ob00526f
日期:——
The C-alkylation of cyclic α-nitroketones with α-halobenzyl halides in the presence of DBU followed by a Pd-catalyzed intramolecular C-arylation afforded benzo-and naphtho-fused bicyclo[n.3.1]alkane derivatives (n = 3, 4, 5) in excellent overall yields for the two-step sequence. In some of the reactions starting from α-nitrocyclooctanone, the major products were fused indane derivatives arising from an intramolecular attack of an intermediate Pd species onto the carbonyl group, followed by elimination.
环状α-硝基酮与α-卤苄卤化物在DBU存在下进行C-烷基化反应,再经Pd催化的分子内C-芳基化反应,成功合成了苯并和萘并融合的双环[n.3.1]烷烃衍生物(n = 3, 4, 5),在这两步反应中得到了优良的整体产率。在某些以α-硝基环辛酮为起始材料的反应中,主要产物为融合的吲哚衍生物,源于中间Pd物种对羰基的分子内攻击,随后发生消除反应。