title: Revision of outcome and mechanism of a new multicomponent reaction.
abstract: [reaction: see text] A recently reported multicomponent reaction (MCR) produces pyrido[1,2-a]pyrazines and not the previously described 1H-imidazol-4-yl-pyridines. This different structure is proposed on the basis of a new mechanism of formation and the spectroscopic data.
authors.affiliation: Departamento de Investigación, Lilly, S. A. Avenida de la Industria 30, 28108, Alcobendas, Madrid, Spain. carballares_santiago@lilly.com
authors.forename: Santiago
authors.initials: S
authors.lastname: Carballares
authors.forename: Juan F
authors.initials: JF
authors.lastname: Espinosa