Gold(I)-Catalyzed Dearomative [2+2]-Cycloaddition of Indoles with Activated Allenes: A Combined Experimental-Computational Study
作者:Riccardo Ocello、Assunta De Nisi、Minqiang Jia、Qing-Qing Yang、Magda Monari、Pietro Giacinto、Andrea Bottoni、Gian Pietro Miscione、Marco Bandini
DOI:10.1002/chem.201503598
日期:2015.12.7
providing high yields and excellent stereochemical controls in the desired cycloadducts. The computational (DFT) investigation has fully elucidated the reaction mechanism providing clear evidence for a two‐step reaction. Two parallel reaction pathways explain the regioisomeric products obtained under kinetic and thermodynamic conditions. In both cases, the dearomative CC bond‐forming event turned out
通过联合的实验/计算研究证明了金催化的亚甲基2,3-环丁烷-吲哚的合成。除了优化三环吲哚化合物的外消旋合成外,还全面介绍了对映选择性变体。特别地,该反应的范围包括作为亲电子伙伴的芳氧基烯丙二烯和烯丙酰胺,在所需的环加合物中提供了高产率和优异的立体化学控制。计算(DFT)研究充分阐明了反应机理,为两步反应提供了明确的证据。两条平行的反应路径解释了在动力学和热力学条件下获得的区域异构产物。在这两种情况下,脱芳香剂C形成碳债券的事件被证明是决定利率的步骤。