title: One-pot synthesis of 1,3,5-triazine derivatives via controlled cross-cyclotrimerization of nitriles: a mechanism approach.
abstract: The reaction of equimolecular amounts of a nitrile and triflic anhydride or triflic acid at low temperature produces an intermediate nitrilium salt that subsequently reacts with 2 equiv of a different nitrile at higher temperature to form 2,4-disusbstituted-6-substituted 1,3,5-triazines in moderate to good yields. This synthetic procedure has also been applied to the preparation of a 1,3,5-triazine having three different substituents. The results are explained in terms of a mechanism based on the relative stability of the intermediate nitrilium salts that are formed through a reversible pathway. The formation of a substituted isoquinoline using benzyl cyanide as the second nitrile supports the postulated mechanism as well as the structure of derivatives of the proposed intermediate when the reaction is carried out in the presence of different nucleophiles other than nitriles. Theoretical calculations and the monitoring of the reaction using (1)H and (13)C NMR spectroscopy are in agreement with the proposed mechanism pathway.
authors.affiliation: Departamento de Química Orgánica and ‡CAI de RMN y RSE, Facultad de Ciencias Químicas, Universidad Complutense , E-28040 Madrid, Spain.
authors.forename: Antonio
authors.initials: A
authors.lastname: Herrera
authors.forename: Alberto
authors.initials: A
authors.lastname: Riaño
authors.forename: Ramón
authors.initials: R
authors.lastname: Moreno
authors.forename: Bárbara
authors.initials: B
authors.lastname: Caso
authors.forename: Zulay D
authors.initials: ZD
authors.lastname: Pardo
authors.forename: Israel
authors.initials: I
authors.lastname: Fernández
authors.forename: Elena
authors.initials: E
authors.lastname: Sáez
authors.forename: Dolores
authors.initials: D
authors.lastname: Molero
authors.forename: Angel
authors.initials: A
authors.lastname: Sánchez-Vázquez
authors.forename: Roberto
authors.initials: R
authors.lastname: Martínez-Alvarez