Direct C-H/C-H Coupling of the Azoloannulated Pteridines with Electron Rich (Hetero)Aromatic Compounds.

The methods for modification of azoloannulated pteridines with (hetero)aromatic nucleophiles using a nucleophilic substitution of hydrogen (S N H ) methodology have been developed in this work. Stable intermediate σ H -adducts, as well as products of an unexpected intramolecular rearrangement of diadducts, have been isolated and characterized. The potential of the proposed approach for obtaining donor-acceptor systems, in which the pteridine fragment of the molecule acts as an acceptor, was demonstrated. The main photophysical properties of the obtained D-A compounds have been studied.