A protocol for C–H/C–H cross-coupling reaction between 7-aminocoumarins and 1,2,4-triazines
has been developed. The reaction was carried out under heptafluorobutyric acid catalysis
providing products with yield up to 91%. The applicability and scope of the proposed
method was demonstrated on 25 compounds containing different substituents both in
the triazine ring and at the nitrogen atom of 7-aminocoumarins. The study of the reaction
mechanism by EPR and radical trapping suggests that radicals are involved in this
transformation.
Key words
7-aminocoumarin - cross-dehydrogenative coupling - 1,2,4-triazine - heptafluorobutyric
acid - coumarin fluorophore - single electron transfer