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 (SNH) methodology have been developed
in this work. Stable intermediate σH-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.