Palladium-Catalyzed Sequential Alkylation−Alkenylation Reactions. Application to the Synthesis of 2-Substituted-4-Benzoxepines and 2,5-Disubstituted-4-Benzoxepines
作者:Mark Lautens、Jean-François Paquin、Sandrine Piguel
DOI:10.1021/jo025730z
日期:2002.5.1
The synthesis of 2-substituted-4-benzoxepines and 2,5-disubstituted-4-benzoxepines from aryl iodides and bromoenoates is described. This methodology is based on a palladium-catalyzed aromatic substitution followed by an intramolecular Heck sequence. Under the reaction conditions (Pd(OAc)(2) (10 mol %), tri-2-furylphosphine (20 mol %), norbornene (2 equiv), Cs(2)CO(3) (2 equiv), CH(3)CN, 85 degrees
描述了由芳基碘化物和溴烯酸酯合成2-取代的4-苯并x庚因和2,5-二取代的4-苯并x庚因。该方法基于钯催化的芳族取代,然后是分子内的Heck序列。在反应条件下(Pd(OAc)(2)(10 mol%),三-2-呋喃膦(20 mol%),降冰片烯(2当量),Cs(2)CO(3)(2当量),CH( 3)获得85℃的CN,可中等至极高收率的带有大量取代基(Me,F,Cl等)的苯并二氢吡啶。