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Sulfonamide-Controlled Pd(II)-Catalyzed [5+2] Rollover Annulation to Access (Hetero)pyrido-Fused 1-Benzazepines
Alejandro Suárez-Lustres1, Jesús A Varela1, Carlos Saá1
1Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), Departamento de Química Orgánica, Universidade de Santiago de Compostela, 15782Santiago de Compostela, Spain.
None:
A novel palladium-catalyzed rollover annulation is developed for the synthesis of pyrido-fused 1-benzazepines from N-sulfonyl-N-phenyl-2-aminopyridines and alkynes. Operating via a formal [5+2] cycloaddition with sequential aryl and heteroaryl C-H activations, the reaction relies on a key sulfonamide directing group to control periselectivity over competing [3+2] indole formation. The resulting benzazepines provide direct access to complex seven-membered N-heterocycles and serve as versatile intermediates for divergent skeletal editing into ring-expanded sultams and ring-contracted pyrroles.
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