The cyclization of o-(alkynyl)-3-(methylbut-2-enyl)benzenes, 1,6-enynes having a condensed aromatic ring at C3–C4 positions, has been studied under the catalysis of cationic gold(I) complexes. The selective 6-endo-dig mode of cyclization observed for the 7-substituted substrates in the presence of water or methanol giving rise to hydroxy(methoxy)-functionalized dihydronaphthalene derivatives is highly remarkable in the context of the observed reaction pathways for the cycloisomerizations of 1,6-enynes bearing a trisubstituted olefin.
对于具有在C3-C4位置具有紧凑芳香环的o-(炔基)-3-(甲基丁-2-烯基)苯基,即1,6-烯炔化合物,在阳离子金(I)配合物的催化下进行了环化反应。在水或甲醇存在下观察到了7-取代底物的选择性6-内-内模式环化,形成了羟基(甲氧基)官能化的二氢萘衍生物,在观察到的环异构化反应途径中,对于具有三取代烯烃的1,6-烯炔基的反应途径来说,这是非常显著的。