Visible‐Light Cascade Photooxygenation of Tetrahydrocarbazoles and Cyclohepta[
<i>b</i>
]indoles: Access to
<i>C</i>
,
<i>N</i>
‐Diacyliminium Ions
作者:Mario Frahm、Thorsten Drathen、Lisa Marie Gronbach、Alice Voss、Felix Lorenz、Jonas Bresien、Alexander Villinger、Frank Hoffmann、Malte Brasholz
DOI:10.1002/anie.202007549
日期:2020.7.20
Tetrahydrocarbazoles and perhydrocyclohepta[b]indoles undergo a catalytic cascade singlet oxygenation in alkaline medium, which leads to chiral tricyclic perhydropyrido‐ and perhydroazepino[1,2‐a]indoles in a single operation. These photooxygenation products are new synthetic equivalents of uncommon C,N‐diacyliminium ions and can be functionalized with the aid of phosphoric acid organocatalysis.
四氢咔唑和全氢环庚[b]吲哚在碱性介质中经历催化级联单线态氧合反应,这会在一次操作中导致手性三环全氢吡啶并全氢哌啶[1,2-a]吲哚。这些光氧化产物是不常见的C,N-二酰基亚胺离子的新合成等价物,可以借助磷酸有机催化进行功能化。