Expedient Synthesis of Bridged Bicyclic Nitrogen Scaffolds via Orthogonal Tandem Catalysis.
Sovan BiswasBen F Van SteijvoortMarjo WaeterschootNarendraprasad Reddy BheemireddyGwilherm EvanoBert U W MaesPublished in: Angewandte Chemie (International ed. in English) (2021)
Bridged nitrogen bicyclic skeletons have been accessed via unprecedented site- and diastereoselective orthogonal tandem catalysis from readily accessible reactants in a step economic manner. Directed Pd-catalyzed γ-C(sp3 )-H olefination of aminocyclohexane with gem-dibromoalkenes, followed by a consecutive intramolecular Cu-catalyzed amidation of the 1-bromo-1-alkenylated product delivers the interesting normorphan skeleton. The tandem protocol can be applied on substituted aminocyclohexanes and aminoheterocycles, easily providing access to the corresponding substituted, aza- and oxa-analogues. The Cu catalyst of the Ullmann-Goldberg reaction additionally avoids off-cycle Pd catalyst scavenging by alkenylated reaction product. The picolinamide directing group stabilizes the enamine of the 7-alkylidenenormorphan, allowing further product post functionalizations. Without Cu catalyst, regio- and diastereoselective Pd-catalyzed γ-C(sp3 )-H olefination is achieved.
Keyphrases
- room temperature
- metal organic framework
- molecular docking
- ionic liquid
- visible light
- aqueous solution
- highly efficient
- reduced graphene oxide
- randomized controlled trial
- klebsiella pneumoniae
- pseudomonas aeruginosa
- tissue engineering
- drug resistant
- multidrug resistant
- electron transfer
- quantum dots
- energy transfer