Ytterbium-catalyzed formal [4+2] cycloaddition: synthesis of chalcogen-quinolines 3-unsubstituted - Oliveira, Isadora M. de; Darbem, Mariana P; Esteves, Carlos Henrique Alves; Pimenta, Daniel C; Schpector, Júlio Zukerman; Stefani, Hélio Alexandre; Manarin, Flávia (Tetrahedron Letters, 2018)