Synthesis and characterization of novel phosphorescent host materials based on triphenylpyridine derivatives

TMSOTf-mediated Kröhnke pyridine synthesis using HMDS as the nitrogen source under microwave irradiation

“…8 Due to their excellent π-stacking ability and thermal stability, these substituted pyridines can be used in fluorescent small molecules, polymers, supramolecules, and for asymmetric catalysis and coordination. 9 They are also recognized as useful precursors as they are structurally related to symmetrical triaryl-thiopyrylium, triaryl-selenopyrylium, and triaryl-telluropyrylium photosensitizers, and have been investigated for photodynamic cell-specific cancer therapeutic agents. 10 These chalcogenopyrylium analogues are also applied in achieving nucleophilic displacement, 11 C -alkylation of β-diketones via a radical pathway, 12 electrophilic aminations, 13 and for the preparation of substituted azepines.…”