Palladium-Catalyzed Formal (5 + 2) Annulation between ortho-Alkenylanilides and Allenes. 2017

Borja Cendón, and Noelia Casanova, and Cezar Comanescu, and Rebeca García-Fandiño, and Andrés Seoane, and Moisés Gulías, and José L Mascareñas
Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Orgánica, Universidade de Santiago de Compostela , 15782 Santiago de Compostela, Spain.

2-Alkenyltriflylanilides react with allenes upon treatment with catalytic amounts of Pd(OAc)2 and Cu(II) to give highly valuable 2,3-dihydro-1H-benzo[b]azepines, in good yields, and with very high regio- and diastereoselectivities. Density functional theory (DFT) calculations suggest that the C-H activation of the alkenylanilide involves a classical concerted metalation-deprotonation (CMD) mechanism.

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