Mendoza-Espinosa, D. Negrón-Silva, G. Lomas-Romero, L.; Gutiérrez-Carrillo, A.; Santillán, R. Pseudo-Four-Component Click Preparation of N-benzyl substituted 1,2,3-triazols based in Aniline. Molecules, 2014, 19, 55-66.
he pseudo-four component click synthesis of dibenzylated 1,2,3-triazoles derived from aniline is reported. The cycloaddition of sodium azide to N-(prop-2-ynyl)-benzenamine (I) in the presence of equimolar amounts of p-substituted benzyl derivatives, yields a mixture of mono- and dibenzylated 1,2,3-triazoles. When two equivalents of the benzyl derivative are added to the multicomponent reaction, the selective preparation of the dibenzylated compounds is achieved. The reactivity of the aniline N-H bond in monobenzylated 1,2,3-triazoles was tested by treatment with one equivalent of a p-substituted benzyl chloride at 40 C, rendering the dibenzylated derivatives quantitatively.