Cascade Annulation Enabled Access to Functionalized Polyaza Tetracycles With Fused Imidazo Scaffolds for Fluorescence “Turn‐Off” Sensing of Benzaldehyde Derivatives
Regioselective Ru(II)‐catalyzed C(sp 2 )─H activation with concomitant (4+2) cascade annulation materializes the benzimidazo‐ and imidazopyridine‐fused quinazolinyl ketones and quinazoline derivatives employing acyl azides and α‐azido ketones as the representative coupling surrogates. The insight of this protocol...