Several novel types of cyclophanes were efficiently synthesized via an intermolecular palladium-catalyzed cross-benzannulation of cyclic enynes and diynes. These types of cyclophanes are not accessible through an intramolecular mode of the homo-benzannulation protocol, reported previously. Cyclic reactants (enynes and diynes) were readily prepared in reasonable yields from commercially available materials
通过分子间
钯催化的环状烯炔和二炔的交叉
苯甲酸酯有效地合成了几种新型的环烷。这些类型的环烷无法通过以前报道的均苯并烷化方案的分子内模式访问。环状反应物(烯炔和二炔)很容易用已知方法从市售材料中以合理的收率制备。环状Z-烯炔29与其E-配偶体相比,进行了苯甲环化反应以生产环烷28,这一事实为在非活化烯炔的末端烯烃部分必须具有E-氢原子提供了额外的支持。以前在无环底物的苯并环中。