Ph₃P‐I₂‐mediated Syntheses of C‐12 Carboxamide Indoloquinazolines and 2‐Aminosubstituted‐indol‐3‐ones from Isatins and Amines

The Ph₃P-I₂-mediated reactions between isatins and amines were extensively investigated leading to the discovery of highly selective and divergent routes toward the synthesis of two distinct classes of indole-based frameworks. Through a strategic design of the reaction paths, we overcome potential side reactions to achieve convenient and straightforward one-pot methods to access either indoloquinazolines with C-12 carboxamide or 2-aminosubstituted indol-3-ones using the same reagent system. Mechanistic studies reveal the role of Ph₃P-I₂ in governing product selectivity, providing an efficient route to novel fused-indolone derivatives with promising applications in drug discovery and medicinal chemistry.