Lewis Acid-Catalyzed Carbofunctionalization of Uncommon <i>C</i>,<i>N</i>-Diacyliminium Ions: Controlling Regio- and Enantioselectivity
作者:Lisa Marie Gronbach、Alice Voss、Mario Frahm、Alexander Villinger、Jonas Bresien、Dirk Michalik、Malte Brasholz
DOI:10.1021/acs.orglett.1c02857
日期:2021.10.15
precursors to novel and uncommon cyclic C,N-diacyliminium ions 3. We report here the first Lewis acid-catalyzed C–C bond forming reactions of these species with TMSCN and silyl enol ethers as nucleophiles and utilizing TIPSOTf as well as Sc(OTf)3 as catalysts. Employing Sc(OTf)3/pybox complexes as a chiral catalyst system, regio- and enantioselective asymmetric alkylations with silyl enol ethers were achieved
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‐diacyliminiumions and can be functionalized with the aid of phosphoric acid organocatalysis.