[2+2+2] Cycloisomerisation of Aromatic Cyanodiynes in the Synthesis of Pyridohelicenes and Their Analogues
作者:Jiří Klívar、Andrej Jančařík、David Šaman、Radek Pohl、Pavel Fiedler、Lucie Bednárová、Ivo Starý、Irena G. Stará
DOI:10.1002/chem.201602747
日期:2016.9.26
We have developed a methodology for the synthesis of pyridohelicenes and their analogues based on the Ni0‐, CoI‐ or RhI‐mediated intramolecular [2+2+2] cycloisomerisation of cyanodiynes. It allows for folding the linear precursors into the corresponding helical backbones comprising the newly formed pyridine unit in their central part. Along with racemic pyrido[n]helicenes (n=5,6,7) and their derivatives
我们已经基于氰基二炔的Ni 0-,Co I-或Rh I介导的分子内[2 + 2 + 2]环异构化反应,开发了吡啶并螺旋酮及其类似物的合成方法。它允许将线性前体折叠成在其中心部分包括新形成的吡啶单元的相应的螺旋主链。通过使用手性底物制备外消旋吡啶并[ n ]螺旋烯(n = 5,6,7)及其衍生物,同时制备对映体和非对映体纯吡啶并[ n ]螺旋状分子(n = 5,6)。相应的对映纯氰二炔的受控环化。