6516-53-6Relevant articles and documents
Asymmetric Dearomative Cascade Multiple Functionalizations of Activated N-Alkylpyridinium and N-Alkylquinolinium Salts
Chen, Ying-Chun,Du, Wei,Song, Xue,Yan, Ru-Jie
supporting information, p. 7617 - 7621 (2020/10/09)
An enantioselective cascade reaction of N-alkylpyridinium and -quinolinium salts with o-hydroxybenzylideneacetones to access fused polyheterocycles through cross dienamine-mediated addition followed by trapping of the dearomatized enamine-type intermediates and aminal formation has been developed. A cascade assembly of N-benzyl-4-methylpyridinium salt and cyclic 2,4-dienones is further disclosed to give bridged frameworks via repetitive dearomatization and aromatization activation.
Nucleophilic Dearomatization of Pyridines under Enamine Catalysis: Regio-, Diastereo-, and Enantioselective Addition of Aldehydes to Activated N-Alkylpyridinium Salts
Bertuzzi, Giulio,Sinisi, Alessandro,Pecorari, Daniel,Caruana, Lorenzo,Mazzanti, Andrea,Bernardi, Luca,Fochi, Mariafrancesca
supporting information, p. 834 - 837 (2017/02/26)
Catalytic addition of chiral enamines to azinium salts is a powerful tool for the synthesis of enantioenriched heterocycles. An unprecedented asymmetric dearomative addition of aldehydes to activated N-alkylpyridinium salts is presented. The process exhibits complete C-4 regioselectivity along with high levels of diastereo- and enantiocontrol, achieving a high-yielding synthesis of a broad range of optically active 1,4-dihydropyridines. Moreover, the presented methodology enables the synthesis of functionalized octahydropyrrolo[2,3-c]pyridines, the core structure of anticancer peptidomimetics.
Pyridinium salts - Versatile reagents for the regioselective synthesis of functionalized thiazocino[2,3-b]indoles by tandem dinucleophilic reactions of thiooxindoles
Kiamehr, Mostafa,Gormay, Pavel V.,Villinger, Alexander,Langer, Peter,Iaroshenko, Viktor O.,Moghaddam, Firouz Matloubi,Semeniuchenko, Volodymyr
supporting information, p. 9685 - 9693,9 (2020/08/20)
The reaction of thiooxindoles with various 2- and 3-substituted pyridinium salts afforded a variety of functionalized thiazocinoindoles. The products have been prepared in good to excellent yields by regioselective dinucleophilic C/S-cyclocondensation of