A new and practical protocol for the synthesis of medicinally privileged azolo[1,3,5]triazines by simply heating under air has been presented. The in situ generated N-azolo amidines from commercially available aromaticaldehydes and 3-aminoazoles with ammonium iodide undergo the second diamination to accomplish the [3 + 1 + 1 + 1] heteroannulation reaction. This convenient process is appreciated by
Iodine/Copper(I)-Catalyzed Direct Annulation of <i>N</i>
-Benzimidazolyl Amidines with Aldehydes for the Synthesis of <i>Ortho</i>
-Fused 1,3,5-Triazines
direct annulation reaction of N‐benzimidazolyl amidines with aldehydes has been established and allows the synthesis of ortho‐fused 1,3,5‐triazine derivatives. The N‐benzimidazolyl amidine substrates are readily accessible by the addition of 2‐aminobenzimidazoles to the corresponding nitriles. In the presence of molecular iodine and copper iodide, cyclization of benzimidazolyl amidines with various aldehydes