Journal of Organic Chemistry 2011-08-05

Cationic palladium-catalyzed [5 + 2] annulation of 2-acylmethoxyarylboronic acids and allenoates: synthesis of 1-benzoxepine derivatives.

Xufen Yu, Xiyan Lu

Index: J. Org. Chem. 76 , 6350, (2011)

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Abstract

The 1-benzoxepine derivatives were synthesized conveniently by cationic palladium-catalyzed [5 + 2] annulation reaction of 2-acylmethoxyarylboronic acids with allenoates in high yields. This annulation involves the intramolecular nucleophilic addition to ketones without the formation of π-allylpalladium species.