Copper-Catalyzed Oxidative Ring Closure and Carboarylation of 2-Ethynylanilides, Ádám Sinai, Ádám Mészáros, Tamás Gáti, Veronika Kudar , Anna Palló, Zoltán Novák, Org. Lett. 2013, 15, 5654–5657. DOI: 10.1021/ol402600r | [Full Text Link] [Supp. Info Link, CIF1, CIF2]

A new copper-catalyzed oxidative ring closure of ethynyl anilides with diaryliodonium salts was developed for the highly modular construction of benzoxazines bearing a fully substituted exo double bond. The oxidative transformation includes an unusual 6-exo-dig cyclization step with the formation of C–O and C–C bonds.