Intermolecular Dehydrative Coupling and Intramolecular Cyclization of Ruthenium Vinylidene Complexes Formed from Aromatic Propynes Containing Carbonyl Functionalities
作者:Pi-Yeh Chia、Cheng-Chen Kuo、Shou-Ling Huang、Yi-Hong Liu、Ling-Kang Liu、Ying-Chih Lin
DOI:10.1002/asia.201801303
日期:2018.12.18
2 h, respectively. However, no similar intermolecular coupling was observed, instead, the intramolecular dehydration yields 8 f, 8 g and 8 h, respectively. In CDCl3, catalytic cyclization is observed for the o‐propynylphenyl ketone 1 h with [Ru]–Cl at 50 °C giving the isochromene products 14 h. Furthermore, treatment of the o‐propynylaryl α,β‐unsaturated ketones 1 k–m and 1 n with [Ru]–Cl in MeOH affords
具有C-C键的形成一个显着的分子间脱水偶联反应被发现的偏复杂 2,得到双核络合物bisvinylidene 4。含1-羟基茚满部分的配合物 2 a首先是通过环化过程由邻丙炔基苯甲醛1 a与[Ru] -Cl([Ru] = Cp(PPh 3)2 Ru)反应形成的。对于在芳基环上包含一个额外的1,3-二氧戊环基团的类似醛1 b,类似的分子间偶合反应可生成双核双亚乙烯基配合物 4 b。然而,醛1 c中芳基环上的氟基抑制偶联反应,仅得到亚乙烯基配合物 2c。对于[Ru] –Cl在MeOH中与分别具有酮官能团的化合物 1 f,1 g和1 h的反应,环化作用分别得到亚乙烯基配合物 2 f,2 g和2 h。然而,没有观察到类似的分子间偶联,相反,分子内脱水分别产生8f,8g和8h。在CDCl 3中,在50°C下用[Ru] –Cl观察到邻丙炔基苯基酮1 h催化环化,得到异苯并二氢萘产物14小时。此外,在甲醇中用[Ru]