Palladium-Catalyzed Formation of Highly Substituted Naphthalenes from Arene and Alkyne Hydrocarbons
作者:Yao-Ting Wu、Ke-Hsin Huang、Chien-Chueh Shin、Tsun-Cheng Wu
DOI:10.1002/chem.200800538
日期:2008.7.28
Several highly substituted naphthalenes 3 have been synthesized in a one-pot reaction by treatment of arenes 1 with alkynes 2 in the presence of palladium acetate and silver acetate. In this Pd-catalyzed protocol, an arene provides a benzo source for the construction of a naphthalene core through twofold aryl C-H bond activation. Reaction of triphenylphosphine with diphenylethyne (2 a) under the catalysis
在乙酸钯和乙酸银的存在下,通过用炔烃2处理芳烃1,通过一锅法反应合成了几种高度取代的萘3。在此Pd催化的方案中,芳烃通过两次芳基CH键活化提供了苯环源,用于构建萘核。在Pd(IV)配合物的催化下,三苯膦与二苯乙炔(2 a)的反应产生1,2,3,4-四苯基萘(3 ba),产率为62%。在此,三苯基膦经历一个芳基CP键裂解和一个芳基CH键活化以用作苯并部分。分析了环加合物3 ea,3 ga和3 ac的晶体结构。扭曲的萘不仅来自过度拥挤的取代基,还来自CH(3)-pi相互作用的贡献。